WO2025263192A1 - Poudre de particules de nitrure de bore hexagonal, son procédé de production, composition de résine et matériau de dissipation de chaleur - Google Patents

Poudre de particules de nitrure de bore hexagonal, son procédé de production, composition de résine et matériau de dissipation de chaleur

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Publication number
WO2025263192A1
WO2025263192A1 PCT/JP2025/017963 JP2025017963W WO2025263192A1 WO 2025263192 A1 WO2025263192 A1 WO 2025263192A1 JP 2025017963 W JP2025017963 W JP 2025017963W WO 2025263192 A1 WO2025263192 A1 WO 2025263192A1
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Prior art keywords
boron nitride
hexagonal boron
powder
particle powder
nitride particle
Prior art date
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Pending
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PCT/JP2025/017963
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English (en)
Japanese (ja)
Inventor
和志 門脇
祥太 台木
智行 柿木
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Tokuyama Corp
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Tokuyama Corp
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Application filed by Tokuyama Corp filed Critical Tokuyama Corp
Priority to JP2025549340A priority Critical patent/JP7796302B1/ja
Publication of WO2025263192A1 publication Critical patent/WO2025263192A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B21/00—Nitrogen; Compounds thereof
    • C01B21/06—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron
    • C01B21/064—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron with boron
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/38—Boron-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L101/00—Compositions of unspecified macromolecular compounds

Definitions

  • the present invention relates to hexagonal boron nitride particle powder, a method for producing the same, a resin composition, and a heat dissipation material.
  • Hexagonal boron nitride is a white powder that generally has a hexagonal layered structure similar to graphite, and is a material that possesses many properties, including high thermal conductivity, high heat resistance, high electrical insulation, high lubricity, corrosion resistance, good mold release properties, and high chemical stability. Therefore, resin compositions filled with hexagonal boron nitride powder can be molded and used as thermally conductive insulating sheets.
  • Thermally conductive insulating sheets for automotive electronic components in particular must also have a low specific gravity, and hexagonal boron nitride powder, which has a lower specific gravity than other highly thermally conductive fillers such as aluminum nitride and aluminum oxide, is attracting attention (see Patent Documents 1 and 2).
  • Hexagonal boron nitride single particles are anisotropic, possessing high thermal conductivity only in the long axis direction. Therefore, a sheet filled with hexagonal boron nitride particles with their short axes aligned in the thickness direction of the sheet cannot exhibit sufficient thermal conductivity in the thickness direction. Therefore, in order for a resin composition filled with hexagonal boron nitride particle powder to have high thermal conductivity, it is necessary to contain agglomerates of hexagonal boron nitride particles within the resin composition. Furthermore, when molding the resin composition for various applications, it is considered important to increase the cohesive strength so that the agglomerates can be maintained even when a certain molding pressure is applied. However, hexagonal boron nitride particle agglomerates with high cohesive strength tend to contain air gaps known as voids within them, and the presence of voids is thought to cause deterioration of insulation properties.
  • the force applied during molding into a sheet or the like causes some of the aggregates to collapse, thereby preventing the occurrence of voids.
  • the aggregates have a cohesive strength that causes them to collapse when kneaded with resin, the hexagonal boron nitride particle aggregates are lost during the kneading process, and the long diameter direction of the particles becomes oriented in the plane of the sheet when the sheet is formed, which can result in a decrease in the thermal conductivity of the sheet in the thickness direction.
  • Patent Document 2 when powder containing aggregates is filled into resin, the aggregates can have a compressive fracture strength that allows some of them to collapse while maintaining an aggregated state overall.
  • the hexagonal boron nitride particle aggregates further collapse and are lost during the kneading process after filling, and when the sheet is formed, the long axis direction of the particles becomes oriented in the plane direction of the sheet, which can result in a decrease in the thermal conductivity of the sheet in the thickness direction.
  • one aspect of the present invention aims to provide hexagonal boron nitride particle agglomerates that, when molded into a thermally conductive insulating sheet, can maintain the structure of the agglomerates while suppressing the occurrence of voids that lead to a decrease in insulating properties, and a hexagonal boron nitride particle powder containing the hexagonal boron nitride particle agglomerates.
  • one embodiment of the present invention provides a hexagonal boron nitride particle powder comprising agglomerates of plate-like hexagonal boron nitride particles, wherein the agglomerates in the powder have a compressive fracture strength of 0.5 to 3.0 MPa, the powder has an average particle size of 25 to 60 ⁇ m, and when 0.5 g of the powder is subjected to ultrasonic treatment in 20 g of an ethanol dispersion medium using a homogenizer for 20 minutes at an amplitude of 35%, the ratio of the cumulative volume 90% particle size of the powder after the treatment to the cumulative volume 90% particle size of the powder before the treatment is 50 to 90%.
  • One aspect of the present invention provides hexagonal boron nitride particle agglomerates that, when molded into a thermally conductive insulating sheet, can maintain the structure of the agglomerates while suppressing the occurrence of voids that lead to a decrease in insulating properties, and a hexagonal boron nitride particle powder containing the hexagonal boron nitride particle agglomerates.
  • the inventors conducted extensive research to solve the above-mentioned problems.
  • the production of thermally conductive insulating sheets involves mixing hexagonal boron nitride particle powder with resin, followed by a resin molding process to mold the mixture. Therefore, they investigated hexagonal boron nitride particle agglomerates with various compressive fracture strengths. As a result, they discovered hexagonal boron nitride particle agglomerates that can maintain their agglomerate structure when mixed with resin using a general-purpose mixer, and that have a compressive fracture strength that allows some of the agglomerate to collapse during resin molding using a general-purpose molding machine. Furthermore, they discovered that when these agglomerates are molded, they can maintain their structure while suppressing the occurrence of voids that lead to reduced insulation properties.
  • hexagonal boron nitride particles are sintered in the presence of an oxygen-containing calcium compound and, optionally, an oxygen-containing boron compound, it is possible to efficiently obtain hexagonal boron nitride particle agglomerates having the above-mentioned compressive fracture strength, leading to the completion of the present invention.
  • the first invention is a hexagonal boron nitride particle powder containing agglomerates of plate-like hexagonal boron nitride particles, wherein the compressive fracture strength of the agglomerates in the powder is 0.5 to 3.0 MPa, the average particle size of the powder is 25 to 60 ⁇ m, and when 0.5 g of the powder is subjected to ultrasonic treatment in 20 g of an ethanol dispersion medium using a homogenizer at an amplitude of 35% for 20 minutes, the ratio of the cumulative volume 90% particle size of the powder after the treatment to the cumulative volume 90% particle size of the powder before the treatment is 50 to 90%.
  • the content of the aggregates is in the range of 10 to 90% by volume.
  • the hexagonal boron nitride particle powder has a particle size of 90% by cumulative volume of 90 to 160 ⁇ m before ultrasonic treatment.
  • the hexagonal boron nitride particles have a BET specific surface area of 1.5 to 3.0 m 2 /g.
  • the Ca concentration in the aggregate is 100 mass ppm or less.
  • the oil absorption per 100 g of the powder is 70 to 85 mL.
  • hexagonal boron nitride particle powder is preferably used for a resin composition filled with the powder, and further for a heat dissipation material for electronic components made from the resin composition.
  • the second invention is a method for producing the hexagonal boron nitride particle powder of the first invention, which comprises sintering plate-like hexagonal boron nitride particles in the presence of an oxygen-containing calcium compound.
  • an oxygen-containing calcium compound is present in an amount of 10 to 5,000 ppm by mass in terms of Ca relative to 100 parts by mass of the hexagonal boron nitride powder containing the plate-like hexagonal boron nitride particles.
  • Firing is carried out at 1700 to 2200°C in a nitrogen atmosphere.
  • Hexagonal boron nitride particle powder according to one embodiment of the present invention has a compressive fracture strength sufficient to maintain the aggregate structure of the hexagonal boron nitride particle aggregates contained in the powder during the process of kneading with resin using a general-purpose mixer. Therefore, the anisotropy of the thermal conductivity of the hexagonal boron nitride particles is reduced, and high thermal conductivity can be imparted to the resulting resin composition.
  • the aggregates break down as they are molded, making it possible to reduce the voids contained within the aggregates, thereby imparting high insulating properties to the resulting sheet-shaped resin composition.
  • a resin composition filled with hexagonal boron nitride particle powder according to one embodiment of the present invention can be a material that combines high thermal conductivity and electrical insulation properties.
  • the hexagonal boron nitride particle powder according to one aspect of the present invention can be produced by firing hexagonal boron nitride particle powder in the presence of an oxygen-containing calcium compound. It is not clear why the hexagonal boron nitride particle powder according to one aspect of the present invention can be obtained using the above-mentioned production method. The inventors speculate that this is because, during the firing process of the hexagonal boron nitride particle powder, the oxygen-containing calcium compound promotes particle growth and bonding between particles, driven by a reduction in energy on the surface of the hexagonal boron nitride particles.
  • Hexagonal boron nitride particle powder according to one embodiment of the present invention is characterized by having both a specific compression fracture strength and specific disintegrability.
  • This hexagonal boron nitride particle powder maintains the aggregate structure of the aggregates contained in the powder during the process of kneading with resin using a general-purpose mixer, and it is possible to reduce the voids contained within the aggregates after sheet formation.
  • the hexagonal boron nitride particle powder of the present invention is characterized by having a compressive fracture strength of 0.5 to 3.0 MPa.
  • agglomerates contained in the powder collapse during kneading with a resin using a general-purpose mixer, generating plate-like hexagonal boron nitride particles. This prevents the particles from orienting their major axis direction in the sheet plane during sheet formation, resulting in a decrease in thermal conductivity.
  • the compressive fracture strength is preferably 0.9 to 2.7 MPa, and particularly preferably 1.2 to 2.5 MPa.
  • the compressive fracture strength of the hexagonal boron nitride particle powder can be measured by separating the agglomerates from the powder and measuring the agglomerates using a microcompression tester.
  • the hexagonal boron nitride particle powder of the present invention contains agglomerates of plate-like hexagonal boron nitride particles.
  • the proportion of the agglomerates in the powder can be set appropriately depending on the desired purpose.
  • the content of the plate-like hexagonal boron nitride particle agglomerates in the hexagonal boron nitride particle powder is preferably in the range of 10 to 90 volume %, more preferably 20 to 80 volume %, and particularly preferably 30 to 70 volume %, relative to 100 volume % of the powder.
  • the content of the agglomerates can be measured using the method described in the Examples.
  • the average particle size of the hexagonal boron nitride particle powder of the present invention is the 50% cumulative volume particle size measured by dispersing the powder in ethanol as a dispersion medium and measuring the particle size distribution using a laser diffraction/scattering particle size distribution analyzer.
  • the hexagonal boron nitride particle powder of the present invention is characterized by having an average particle size in the range of 25 to 60 ⁇ m. By having the lower limit of the average particle size of the powder within this range, the plate-like hexagonal boron nitride particles can be randomly oriented during sheet formation, preventing a decrease in thermal conductivity.
  • the average particle size is preferably in the range of 30 to 55 ⁇ m, and particularly preferably in the range of 35 to 50 ⁇ m.
  • the hexagonal boron nitride particle powder of the present invention is characterized by its moderate disintegrability upon ultrasonic treatment. Specifically, 0.5 g of the powder is ultrasonically treated in 20 g of ethanol dispersion medium with a homogenizer for 20 minutes at an amplitude of 35%. The ratio of the cumulative 90% volume particle diameter of the powder after ultrasonic treatment to the cumulative 90% volume particle diameter of the powder before the treatment is 50 to 90%. By setting the lower limit of the ratio of the cumulative 90% volume particle diameter after the treatment to the cumulative 90% volume particle diameter before the treatment within the above range, the proportion of aggregates that disintegrate when using a general-purpose mixer can be reduced, and a decrease in thermal conductivity can be suppressed.
  • the ratio of the cumulative 90% volume particle diameter after the treatment to the cumulative 90% volume particle diameter before the treatment is preferably 55 to 85%, and particularly preferably 60 to 80%.
  • the particle size distribution of the above powder can be measured using a laser diffraction/scattering particle size distribution measuring device.
  • the 90% cumulative volume particle size of the hexagonal boron nitride particle powder of the present invention, prior to the ultrasonic treatment, is preferably in the range of 90 to 160 ⁇ m, more preferably 95 to 150 ⁇ m, and particularly preferably 100 to 140 ⁇ m.
  • the plate-shaped hexagonal boron nitride particles can exist as aggregates, and high thermal conductivity can be achieved when a resin composition containing the powder is formed into a sheet.
  • the upper limit of the 90% cumulative volume particle size within the above range, the generation of voids within the aggregates can be suppressed, and a decrease in insulating properties can be suppressed when a resin composition containing the powder is formed into a sheet.
  • the BET specific surface area is preferably in the range of 1.5 to 3.0 m 2 /g, more preferably in the range of 1.7 to 2.9 m 2 /g, and particularly preferably in the range of 2.0 to 2.7 m 2 /g.
  • the upper limit of the specific surface area within the above range, it is possible to suppress a decrease in thermal conductivity, which may occur when the plate-like hexagonal boron nitride particles become fine.
  • the BET specific surface area of the aggregate can be confirmed by measurement using nitrogen gas as the adsorption gas by the BET single-point method.
  • the hexagonal boron nitride particle powder of the present invention can be produced, for example, by calcining plate-like hexagonal boron nitride particles in the presence of an oxygen-containing calcium compound, as described below. During production, Ca derived from the oxygen-containing calcium compound may remain in the powder. Therefore, the Ca concentration in the hexagonal boron nitride particle powder of the present invention is preferably 100 ppm by mass or less, more preferably 80 ppm by mass or less, and particularly preferably 50 ppm by mass or less.
  • the Ca concentration within the above range, it is possible to reduce the amount of Ca that inhibits interparticle bonding in hexagonal boron nitride particle powder obtained, for example, by the production method described below, and to suppress the collapse of aggregates when kneaded with a resin. Furthermore, the lower the Ca content in the hexagonal boron nitride particle powder of the present invention, the better; for example, it may be 0.1 ppm by mass or more, or even 0.0 ppm by mass.
  • the Ca concentration in hexagonal boron nitride particle powder can be confirmed by immersing the powder in a 2 mol/L aqueous sulfuric acid solution at a liquid temperature of 25°C for 120 minutes and quantifying the Ca dissolved into the solution using ICP-OES.
  • the amount of dibutyl phthalate (DBP) absorbed per 100 g of the powder is preferably in the range of 70 to 85 mL.
  • the hexagonal boron nitride particle powder of the present invention is a material that combines high thermal conductivity and electrical insulation. Therefore, when used as a filler in a resin for the purpose of improving electrical insulation or imparting thermal conductivity, the resulting resin composition has high electrical insulation and thermal conductivity.
  • the hexagonal boron nitride particle powder of the present invention can also be used as a raw material for boron nitride processed products such as cubic boron nitride and boron nitride molded products, a nucleating agent for engineering plastics, a phase change material, a solid or liquid thermal interface material, a release agent for molten metal or molten glass molds, cosmetics, a composite ceramic raw material, and other applications.
  • resins used to obtain the above resin composition include thermoplastic resins such as polyolefins, vinyl chloride resins, methyl methacrylate resins, nylons, and fluororesins; thermosetting resins such as epoxy resins, phenolic resins, urea resins, melamine resins, unsaturated polyester resins, and silicone resins; and synthetic rubbers.
  • the resin composition may contain known additives as compounding agents, such as known polymerization initiators, curing agents, polymerization inhibitors, polymerization retarders, coupling agents, plasticizers, UV absorbers, pigments, dyes, antibacterial agents, organic fillers, and organic-inorganic composite fillers.
  • the resin composition may also contain other inorganic fillers as long as the effects of the present invention are not impaired.
  • the hexagonal boron nitride particle powder of the present invention can be mixed with a thermally conductive filler such as aluminum nitride or aluminum oxide, which is a common highly thermally conductive insulating filler, to improve the thermal conductivity of the resulting resin composition.
  • a thermally conductive filler such as aluminum nitride or aluminum oxide, which is a common highly thermally conductive insulating filler, to improve the thermal conductivity of the resulting resin composition.
  • the amount of the thermally conductive filler used is preferably 60% by volume or less relative to 100% by volume of the hexagonal boron nitride particle powder, so as not to significantly reduce the water resistance, insulation resistance, and other properties of boron nitride.
  • the thermally conductive resin composition obtained in this manner, or the thermally conductive molded article molded from said composition can be preferably used in applications such as: thermal interface materials such as polymer-based heat dissipation sheets and phase change sheets; heat dissipation tapes; heat dissipation greases; heat dissipation adhesives; organic heat dissipation sheets such as gap fillers; heat dissipation paints and heat dissipation coatings; heat dissipation resin substrates such as PWB (Printed Wiring Board)-based resin substrates and CCL (Copper Clad Layer)-based resin substrates, insulating layers for metal-based substrates such as aluminum-based substrates and copper-based substrates; and encapsulants for power devices.
  • thermal interface materials such as polymer-based heat dissipation sheets and phase change sheets; heat dissipation tapes; heat dissipation greases; heat dissipation adhesives; organic heat dissipation sheets such as gap fillers;
  • the method for producing a hexagonal boron nitride particle powder of the present invention will be described in detail below.
  • the hexagonal boron nitride particle powder of the present invention can be produced by firing plate-like hexagonal boron nitride particles in the presence of an oxygen-containing calcium compound.
  • the oxygen-containing calcium compound has the effect of promoting the growth of the plate-like hexagonal boron nitride particles and the bonding between the plate-like hexagonal boron nitride particles, making it possible to efficiently produce the plate-like hexagonal boron nitride particle agglomerate according to the first aspect of the present invention.
  • the plate-like hexagonal boron nitride particles used in the production method of the present invention can be those contained in hexagonal boron nitride powder obtained by a known production method, such as the following.
  • II) a method of reacting a boron halide with ammonia or an ammonium salt a melamine method in which a boron compound such as boric acid or boron oxide is reacted with a nitrogen-containing compound such as melamine at a temperature of about 800°C;
  • IV a reduction-nitridation method in which an oxygen-containing boron compound and a carbon source are heated to a high temperature of 1600°C or higher in a nitrogen atmosphere to reduce and nitride the oxygen-containing boron compound;
  • the reduction-nitridation method (IV) is particularly preferred because it can achieve high thermal conductivity due to high crystallization achieved by calcination at high temperatures and makes it easy to adjust the compression fracture strength to a lower level.
  • hexagonal boron nitride powder produced by a known production method may be directly subjected to calcination in the presence of an oxygen-containing calcium compound.
  • plate-like hexagonal boron nitride particles may be recovered from hexagonal boron nitride powder produced by a known production method, and the resulting aggregate of particles may be subjected to firing.
  • the recovered aggregate of particles is also one embodiment of the powder containing plate-like hexagonal boron nitride particles.
  • oxygen-containing calcium compound used in the manufacturing method of the present invention can be used as the oxygen-containing calcium compound used in the manufacturing method of the present invention. Of these, calcium oxide and calcium carbonate are preferred.
  • the amount of oxygen-containing calcium compound used can be appropriately determined depending on the desired physical properties of the hexagonal boron nitride particle aggregates. If the amount is too small, aggregate formation tends to be insufficient, while if the amount is too large, Ca tends to remain in the aggregates.
  • the amount of oxygen-containing calcium compound used is preferably 10 to 5,000 ppm by mass, calculated as Ca, per 100 parts by mass of hexagonal boron nitride powder containing plate-like hexagonal boron nitride particles, more preferably 50 to 4,000 ppm by mass, and particularly preferably 100 to 3,000 ppm by mass.
  • the amount of oxygen-containing calcium compound used can be adjusted to fall within the above range by simply mixing the oxygen-containing calcium compound with the hexagonal boron nitride powder to achieve the desired content.
  • the content of oxygen-containing calcium compounds in hexagonal boron nitride powder can be calculated using the following formula:
  • (Calcium equivalent value) ((Ca content (g) in hexagonal boron nitride powder) + (Ca content (g) contained in added oxygen-containing calcium) / (total amount (g) of hexagonal boron nitride powder and oxygen-containing calcium compound)
  • hexagonal boron nitride powder containing an oxygen-containing calcium compound is calcined.
  • the calcination temperature may be appropriately determined within a range that allows hexagonal boron nitride particle aggregates with sufficient compressive fracture strength to be obtained.
  • the calcination temperature is preferably in the range of 1700 to 2200°C, more preferably in the range of 1750 to 2150°C, and particularly preferably in the range of 1800 to 2100°C.
  • firing is preferably carried out in a nitrogen atmosphere to prevent unexpected side reactions.
  • the nitrogen atmosphere contains nitrogen gas as a main component, for example, 90% by volume or more of nitrogen gas, and preferably 100% by volume of nitrogen gas.
  • the nitrogen atmosphere may contain a non-oxidizing gas such as argon gas or helium gas as the remainder.
  • the above-mentioned firing process allows the production of the hexagonal boron nitride particle powder of the present invention.
  • the obtained hexagonal boron nitride particle powder can be separated into hexagonal boron nitride particle agglomerates using a known classifier such as a sieve or air classifier.
  • a known classifier such as a sieve or air classifier.
  • the hexagonal boron nitride particle powder obtained by the production method of the present invention may be subjected to removal of coarse particles and fine powder using a known classifier such as a sieve or air classifier, as necessary.
  • the content of hexagonal boron nitride particle agglomerates can be appropriately adjusted by mixing hexagonal boron nitride particle agglomerates into the hexagonal boron nitride particles, or by mixing hexagonal boron nitride particles into the hexagonal boron nitride particle powder.
  • the compression test was conducted by applying a load to the sample with an indenter, and a graph of test force (mN) vs. displacement ( ⁇ m) at which the sample fractured was shown.
  • the test force (mN) at which the displacement became constant was designated as the fracture point P, and the fracture strength (MPa) was calculated using the following formula:
  • MT-3000 particle size distribution measuring device manufactured by Microtrac-Bell Corporation
  • BET specific surface area of hexagonal boron nitride particle powder 0.5 g of hexagonal boron nitride particle powder was weighed out and degassed at 200°C for 10 minutes, and then the BET specific surface area of the powder was measured by the BET single-point method using nitrogen gas as the adsorption gas. The measurement was performed using a BET specific surface area analyzer (Flowsorb III) manufactured by Shimadzu Corporation.
  • Hexagonal boron nitride particle powder was filled into an epoxy resin to prepare a resin composition, and the thermal conductivity and dielectric breakdown voltage were measured.
  • 40% by volume of the mixture and 60% by volume of hexagonal boron nitride particle powder were mixed in a rotation/revolution mixer (MAZERUSTAR manufactured by Kurabo Industries Co., Ltd.) to obtain a resin composition.
  • the dielectric strength of the 20 sheets was also measured using a voltage resistance tester (YPAD-0225) manufactured by Kyonan Electric Co., Ltd., and the average dielectric strength was used as an index of the insulating properties of the hexagonal boron nitride particle powder.
  • Example 1 0.24 g of calcium oxide was added to 100 g of a powder of plate-like hexagonal boron nitride particles synthesized by reduction-nitridation to adjust the Ca equivalent value to 1000 ppm by mass, and the mixture was mixed using a V-type mixer. Next, 100 g of the mixture was calcined in a graphite Tammann furnace at 1900°C for 6 hours under a nitrogen gas atmosphere to produce a hexagonal boron nitride particle powder.
  • Example 2 The hexagonal boron nitride particle powder obtained in the same manner as in Example 1 was passed through a sieve with 120 ⁇ m openings to separate out coarse particles, thereby producing a hexagonal boron nitride particle powder.
  • Examples 3 to 5 A hexagonal boron nitride particle powder was produced in the same manner as in Example 1, except that the Ca-equivalent values described in the above embodiment were as shown in Table 1.
  • Example 6 The hexagonal boron nitride particle powder obtained in the same manner as in Example 1 was passed through a sieve with 90 ⁇ m openings to separate out coarse particles, thereby producing a hexagonal boron nitride particle powder.
  • Example 7 to 10 The hexagonal boron nitride particle powder was produced and the coarse particles were classified in the same manner as in Example 2, except that the Ca-equivalent values described in the above embodiment were changed to those shown in Table 1.
  • Comparative Example 1 The powder of plate-like hexagonal boron nitride particles synthesized by the reduction-nitridation method used in Examples 1 to 10 was used as Comparative Example 1 as it was.
  • the hexagonal boron nitride particle powder of the present invention can impart high thermal conductivity and high insulating properties to a target when used as a filler, and therefore can be used as a raw material for materials used in electronic components.

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Abstract

Afin de fournir une technologie qui permet de supprimer la génération de vides tout en maintenant la structure d'un agglomérat de particules de nitrure de bore hexagonal en forme de plaque lorsque l'agglomérat est façonné en une feuille isolante thermoconductrice, une poudre de particules de nitrure de bore hexagonal selon un aspect de la présente invention contient un agglomérat de particules de nitrure de bore hexagonal en forme de plaque, l'agglomérat dans la poudre a une résistance à la rupture par compression de 0,5 à 3,0 MPa, la poudre a un diamètre moyen de particule de 25 à 60 µm, et lorsque la puissance a été soumise à un traitement par ultrasons dans des conditions prescrites, le rapport du diamètre de particule à 90 % du volume cumulé de la poudre après le traitement au diamètre de particule à 90 % du volume cumulé de la poudre avant le traitement est de 50 à 90 %.
PCT/JP2025/017963 2024-06-17 2025-05-19 Poudre de particules de nitrure de bore hexagonal, son procédé de production, composition de résine et matériau de dissipation de chaleur Pending WO2025263192A1 (fr)

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WO2022186191A1 (fr) * 2021-03-02 2022-09-09 株式会社トクヤマ Particules agglomérées de nitrure de bore hexagonal, poudre de nitrure de bore hexagonal, composition de résine et feuille de résine
JP2022185586A (ja) * 2021-06-02 2022-12-14 株式会社トクヤマ 六方晶窒化ホウ素粉末及びその製造方法

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WO2016092952A1 (fr) * 2014-12-08 2016-06-16 昭和電工株式会社 Poudre de nitrure de bore hexagonal, procédé de production de cette dernière, composition à base de résine, et feuillet de résine
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WO2022186191A1 (fr) * 2021-03-02 2022-09-09 株式会社トクヤマ Particules agglomérées de nitrure de bore hexagonal, poudre de nitrure de bore hexagonal, composition de résine et feuille de résine
JP2022185586A (ja) * 2021-06-02 2022-12-14 株式会社トクヤマ 六方晶窒化ホウ素粉末及びその製造方法

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