JPH0426552A - Composite ceramic product and its manufacture - Google Patents
Composite ceramic product and its manufactureInfo
- Publication number
- JPH0426552A JPH0426552A JP2129267A JP12926790A JPH0426552A JP H0426552 A JPH0426552 A JP H0426552A JP 2129267 A JP2129267 A JP 2129267A JP 12926790 A JP12926790 A JP 12926790A JP H0426552 A JPH0426552 A JP H0426552A
- Authority
- JP
- Japan
- Prior art keywords
- slurry
- ceramic product
- boron nitride
- composite ceramic
- surface area
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000919 ceramic Substances 0.000 title claims abstract description 41
- 239000002131 composite material Substances 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 229910052582 BN Inorganic materials 0.000 claims abstract description 31
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910052581 Si3N4 Inorganic materials 0.000 claims abstract description 25
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000002002 slurry Substances 0.000 claims abstract description 15
- 238000005245 sintering Methods 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 10
- 238000007582 slurry-cast process Methods 0.000 claims abstract description 8
- 239000002270 dispersing agent Substances 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000004438 BET method Methods 0.000 claims abstract 3
- 238000000034 method Methods 0.000 claims description 18
- 230000035939 shock Effects 0.000 claims description 13
- 238000001272 pressureless sintering Methods 0.000 claims description 5
- 238000010791 quenching Methods 0.000 claims description 5
- 230000000171 quenching effect Effects 0.000 claims description 5
- 239000002245 particle Substances 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 5
- 238000002156 mixing Methods 0.000 abstract description 2
- 238000005266 casting Methods 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229910052878 cordierite Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- 239000011505 plaster Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000002612 dispersion medium Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- -1 ittria Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Ceramic Products (AREA)
- Producing Shaped Articles From Materials (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、窒化珪素系の複合セラミックス製品とその製
造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a silicon nitride-based composite ceramic product and a method for manufacturing the same.
［従来の技術］
窒化珪素系セラミックスは、高強度、高靭性であり、自
動車用部品材料等としても実用化の趨勢にある。しかし
耐熱衝撃性が不十分なために、その用途が制限されてい
る。[Prior Art] Silicon nitride ceramics have high strength and high toughness, and are on the verge of being put to practical use as materials for automobile parts. However, its use is limited due to insufficient thermal shock resistance.
一方、六方晶窒化硼素系セラミックスは耐熱衝撃性が優
れている。しかし強度や耐摩耗性が不十分なために、構
造部材としては広く使用されるに至っていない。On the other hand, hexagonal boron nitride ceramics have excellent thermal shock resistance. However, due to insufficient strength and wear resistance, it has not been widely used as a structural member.
窒化珪素の有する高強度、高靭性を備え、かつ。It has the high strength and toughness of silicon nitride, and.
窒化硼素の耐熱衝撃性を備えたセラミックスが製造でき
ると好ましいことから、これらのセラミックスの複合化
が試みられている０例えば鉄と鋼。Since it would be desirable to be able to produce ceramics with the thermal shock resistance of boron nitride, attempts have been made to combine these ceramics, such as iron and steel.
１９８９、第９号、第１９８〜２０５頁や新素材マニュ
アル１９８８年第５集Ｐ、６９には窒化珪素に窒化硼素
を複合させた複合セラミックスが開示されている。しか
しこの複合セラミックスは水中急冷法で測定した耐熱衝
撃性（ΔＴｃ）は窒化硼素を１０ｔｉｔ％複合したもの
で６００℃、 ４０ｖｔ％複合したもので９００ｍ程度
であるため、熱衝撃が大きい環境で構造部材として用い
る事は難しい。また、窒化硼素の含有量を高めてΔＴｃ
を改善するとセラミック製品の気孔率が大きくなるため
に、複合体の密度は１０ｔｉｔ％のもので２．４５ｇ／
ｃｍ’、 ４０＋ｔ％のもので１．５９ｇ／ｃｍｊと低
く、また強度も低い。1989, No. 9, pp. 198-205 and New Materials Manual, Vol. 5, 1988, P, 69, composite ceramics in which silicon nitride and boron nitride are combined are disclosed. However, the thermal shock resistance (ΔTc) of this composite ceramic measured by an underwater quenching method is 600°C for a 10 tit% boron nitride composite and 900 m for a 40 vt% composite, so it cannot be used as a structural member in an environment with large thermal shocks. It is difficult to use it as In addition, by increasing the content of boron nitride, ΔTc
Since improving the porosity of the ceramic product increases, the density of the composite is 2.45g/10t%.
cm', 40+t% is as low as 1.59 g/cmj, and its strength is also low.
［発明が解決しようとする課題］
例えば、ΔＴｃが１０００℃以上、好ましくは１２００
℃以上の窒化珪素系セラミックスが製造できると。[Problem to be solved by the invention] For example, ΔTc is 1000°C or more, preferably 1200°C
It is possible to produce silicon nitride ceramics with temperatures above ℃.
自動車のエンジン部品材料等としても使用できるために
好ましい。またΔＴｃが１２００℃以上の窒化珪素系セ
ラミックス製品が、泥漿鋳込み法と常圧焼結法で製造で
きると、複雑な形状のものが安価に製造できるために更
に好ましい。It is preferable because it can also be used as a material for automobile engine parts. Further, it is more preferable that a silicon nitride ceramic product having a ΔTc of 1200° C. or more can be manufactured by the slurry casting method and the pressureless sintering method because products with complicated shapes can be manufactured at low cost.
本発明は、窒化硼素を複合させた窒化珪素系複合セラミ
ックスであって、ΔＴｃが１２００℃以上であり、かつ
泥漿鋳込み法と常圧焼結法とで製造が可能な複合セラミ
ックス製品とその製造方法を提供する事を課題としてい
る。The present invention is a silicon nitride-based composite ceramic composited with boron nitride, which has a ΔTc of 1200°C or more, and which can be manufactured by a slurry casting method and an atmospheric pressure sintering method, and a method for manufacturing the same. The challenge is to provide the following.
［課題を解決するための手段］
本発明者等は、窒化珪素粉３０〜９０＆ｔ％に対し、Ｂ
ＥＴ法で測定して１００ｍ”／ｇ以上、好ましくは１０
０〜５００ｍ”／ｇの比表面積を有する窒化硼素を５〜
４５ｗｔ％、焼結助剤を５〜３０ｔｚｔ％含有せしめ、
水と分散剤を加えて粘度が５．０ボイス好ましくは３．
０ポイズ以下の泥漿を作成し、この泥漿を用いて泥漿鋳
込み法および常圧焼結法でセラミックス製品を製造した
が、このセラミックス製品はΔ丁ｃが１２００℃以上で
、極めて優れた耐熱衝撃性を有していた。[Means for Solving the Problems] The present inventors have discovered that B
100 m"/g or more, preferably 10 m"/g or more when measured by the ET method
Boron nitride with a specific surface area of 0 to 500 m"/g
45 wt%, containing 5 to 30 tzt% of sintering aid,
After adding water and a dispersant, the viscosity is 5.0 voices, preferably 3.0 voices.
A slurry of less than 0 poise was created, and a ceramic product was manufactured using this slurry using the slurry casting method and pressureless sintering method.This ceramic product had a Δc of 1200°C or more, and had extremely excellent thermal shock resistance. It had
窒化珪素粉としては、粒度が約１μ鑞の市販の窒化珪素
粉１例えば５ＮＰ−８５あるいは０．６μ閣の５ＮＰ１
０−Ｐ（日本重化学工業■製）を使用する事ができる。As the silicon nitride powder, commercially available silicon nitride powder 1 with a particle size of about 1μ, such as 5NP-85 or 5NP1 with a particle size of 0.6μ, is used.
0-P (manufactured by Japan Heavy Chemical Industries, Ltd.) can be used.
１００〜５００ｍ”／ｇの比表面積を有する窒化硼素は
、六方晶の窒化ＷＩＩ素である例えばＫＢＮ （信越化
学■製、比表面積：約１１６ｍ”／ｇ）やアモルファス
窒化硼素である１例えばＭＢＮ ２５０（三井東圧■製
、比表面積：２４０ｍ”／ｇ）を用いることができる。Boron nitride having a specific surface area of 100 to 500 m"/g includes hexagonal WII nitride, such as KBN (manufactured by Shin-Etsu Chemical, specific surface area: approximately 116 m"/g), and amorphous boron nitride, such as MBN 250. (manufactured by Mitsui Toatsu ■, specific surface area: 240 m"/g) can be used.
本発明で窒化硼素は、窒化珪素セラミックスの焼結微細
構造を改善するために含有せしめる。含有せしめる窒化
硼素の比表面積が１００ｍ２／ｇ未満で１粒子が大きい
時は、セラミックス製品のΔＴｃの改善の程度が少ない
、しかし比表面積が５００ｍ１ｇ超の微粒子は改善効果
もそれ程向上されずまた高価であり、また入手が容易で
はない。In the present invention, boron nitride is contained in order to improve the sintered microstructure of silicon nitride ceramics. When the specific surface area of boron nitride contained is less than 100 m2/g and each particle is large, the degree of improvement in ΔTc of the ceramic product is small. However, fine particles with a specific surface area of more than 500 m2/g do not improve the improvement effect as much and are expensive. Yes, and it is not easy to obtain.
本発明では窒化珪素粉３０〜９０ｗｔ％に対して。In the present invention, it is based on 30 to 90 wt% of silicon nitride powder.
窒化硼素は５〜４５ｗｔ％含有せしめる。窒化硼素が５
ｖｔ％未満では、後で述べるが焼結微細構造の改善が不
十分でΔＴｃは１２００℃以下である。また窒化硼素を
４５ｔｉｔ％超含有せしめると、複合セラミックス製品
の強度が低下する。Boron nitride is contained in an amount of 5 to 45 wt%. Boron nitride is 5
If it is less than vt%, as will be described later, the improvement of the sintered microstructure is insufficient and ΔTc is 1200° C. or less. Moreover, when boron nitride is contained in excess of 45 tit%, the strength of the composite ceramic product decreases.
本発明では、配合した原料に焼結助剤として例えばアル
ミナ・イツトリア系やコージェライト系のものを５〜３
０ｖｔ％加え１分散剤を加えた水を分散媒として、粘度
が５ボイズ以下好ましくは３．０ボイズ以下の泥漿とす
る。焼結助剤が５ｗｔ％未満では緻密なセラミックス製
品が得られない。また３０ｖｔ％超ではセラミックス製
品の常温や高温での強度や硬度が低下する。In the present invention, sintering aids such as alumina, ittria, or cordierite are added to the blended raw materials at a rate of 5 to 30%.
Water containing 0 vt% and 1 dispersant is used as a dispersion medium to form a slurry with a viscosity of 5 voids or less, preferably 3.0 voids or less. If the amount of the sintering aid is less than 5 wt%, a dense ceramic product cannot be obtained. Moreover, if it exceeds 30 vt%, the strength and hardness of the ceramic product at room temperature and high temperature will decrease.
本明細書で泥漿の粘度とは１．ＩＩＳ Ｚ ８８０９に
よる粘度計校正用標準液で校正された回転型粘度計で測
定した粘度をいうが、窒化珪素粉の粒度分布や分散剤の
種類や泥漿のＰＨ等を調整して、粘度を５ポイズ以下好
ましくは３．０ボイズ以下とする。In this specification, the viscosity of slurry is defined as 1. It refers to the viscosity measured with a rotational viscometer calibrated with a standard solution for viscometer calibration according to IIS Z 8809, but the viscosity can be adjusted to 5. Poise or less, preferably 3.0 poise or less.
本発明では、流動性の優れた泥漿を用いるが、粘度を５
．０ポイズ以下好ましくは３．０ポイズ以下とする事に
よって、グリーン成形体の密度を向上させることができ
る。従って焼結時の密度が向上し、ΔＴｃが１２００℃
以上の複合セラミックス製品となる。In the present invention, a slurry with excellent fluidity is used, but the viscosity is
．． The density of the green molded product can be improved by adjusting the temperature to 0 poise or less, preferably 3.0 poise or less. Therefore, the density during sintering is improved, and ΔTc is 1200℃.
The result is a composite ceramic product.
十分に粒子を分散させた上記の泥漿を用い、例えば石膏
型を用いた泥漿鋳込み法によりグリーン成形体を製造す
る。Using the above slurry in which particles are sufficiently dispersed, a green molded body is manufactured by a slurry casting method using, for example, a plaster mold.
このグリーン成形体は、常圧焼結法によって、例えば１
６５０℃の窒素雰囲気炉で焼結する。This green molded body is produced, for example, by the pressureless sintering method.
Sintering is performed in a nitrogen atmosphere furnace at 650°C.
以上の方法によって、本発明の複合セラミックス製品が
得られる。By the above method, the composite ceramic product of the present invention can be obtained.
［作用］
窒化珪素のセラミックス製品は、窒化珪素粒子が相互に
焼結してマトリックスを形成している。[Operation] In silicon nitride ceramic products, silicon nitride particles are sintered with each other to form a matrix.
しかし窒化珪素粒子の相互の焼結部は窒化珪素粒子の内
部とは組織が異なるし、また焼結体には微細な空孔が残
存して、焼結微細構造を形成している。However, the structure of the mutually sintered parts of the silicon nitride particles is different from that of the inside of the silicon nitride particles, and fine pores remain in the sintered body, forming a sintered microstructure.
本発明で、窒化硼素を複合させるとΔ丁Ｃが１２００℃
以上となる理由は必ずしも明らかではないが、本発明で
用いる窒化硼素は極めて微細な粉状であり、且つ表面積
も大きいために、含有せしめた窒化硼素が窒化珪素のマ
トリックスに取り込まれて、結晶核として作用して、あ
るいは析出相の核として作用して、あるいは窒化珪素粒
子の表面と反応して、あるいはその他の作用によって、
焼結微細構造を改善し、セラミックス製品の耐熱衝撃性
を向上させたものと考えられる。In the present invention, when boron nitride is combined, ΔC is 1200°C.
The reason for this is not necessarily clear, but since the boron nitride used in the present invention is in the form of extremely fine powder and has a large surface area, the contained boron nitride is incorporated into the silicon nitride matrix and forms crystal nuclei. by acting as a nucleus of a precipitated phase, by reacting with the surface of silicon nitride particles, or by other actions,
It is thought that this improves the sintered microstructure and improves the thermal shock resistance of ceramic products.
［実施例１．］
本発明者等は、粒度が約１μ履の市販の窒化珪素粉７５
％ｉｔ％と、下記の比表面積の窒化硼素を１０ｗｔ％と
コージェライト（焼結助剤）を１５１１℃％とを配合し
、粘度が０．４〜０．８ポイズの泥漿を作成した。窒化
硼素は、比表面積が２０ｍ２／ｇ、 ８０ｍ″／ｇ。[Example 1. ] The present inventors used commercially available silicon nitride powder 75 with a particle size of about 1 μm.
%it%, 10 wt% of boron nitride having the specific surface area shown below, and 1511°C% of cordierite (sintering aid) to prepare a slurry having a viscosity of 0.4 to 0.8 poise. Boron nitride has a specific surface area of 20 m2/g and 80 m''/g.
１１０ｍ”／ｇ、 ２４０ｍ”／ｇのものを比較した。A comparison was made between 110 m''/g and 240 m''/g.
各泥漿は石膏鋳型に着肉させて、直径６０■φ、厚さ６
ｍｍの各グリーン成形体とした。各グリーン成形体を常
圧で１６５０℃の窒素雰囲気炉を用いて焼結し。Each slurry was attached to a plaster mold, with a diameter of 60 mm and a thickness of 6 mm.
Each green molded body was made into mm. Each green molded body was sintered at normal pressure using a nitrogen atmosphere furnace at 1650°C.
各種の複合セラミックス製品を製造した。この複合セラ
ミックス製品について測定した。水中急冷法によるΔＴ
ｃを第１図に示した。Manufactured various composite ceramic products. This composite ceramic product was measured. ΔT by underwater quenching method
c is shown in Figure 1.
第１図にみられる如く、比表面積が２０ｍ”／ｇ。As seen in Figure 1, the specific surface area is 20 m''/g.
８０ｍ２／ｇの窒化硼素を使用した比較材の複合セラミ
ックスのΔτＣは約１０００〜１０５０℃であるが、比
表面積が１１０ｍ”／ｇ、 ２４０ｍ２／Ｈの窒化硼素
を使用した本発明の複合セラミックスのΔＴｃは１２０
０℃以上で、耐熱衝撃性は顕著に向上している。The ΔτC of the comparative composite ceramic using 80 m2/g of boron nitride is about 1000 to 1050°C, but the ΔTc of the composite ceramic of the present invention using boron nitride with a specific surface area of 110 m"/g and 240 m2/H is 120
At temperatures above 0°C, the thermal shock resistance is significantly improved.
［実施例２］
本発明者等は、粒度が１μ■の市販の窒化珪素粉に下記
の比表面積の窒化硼素を配合量を変えて配合し、実施例
１と同様の方法で粘度が０．４〜１．０ポイズの泥漿を
作成した。窒化硼素は、比表面積が１１０ｍ”／ｇと２
４０ｍ”／ｇのものを用いた。この泥漿を用いて実施例
１と同様の複合セラミックスを製造し、水中急冷法によ
るΔＴｃを調査した。第２図はその結果である。尚第２
図で・は比較例で、窒化硼素を配合しなかった窒化珪素
セラミックスの例である。[Example 2] The present inventors blended boron nitride with the specific surface area shown below in different amounts into commercially available silicon nitride powder with a particle size of 1 μm, and used the same method as in Example 1 to obtain a viscosity of 0. A slurry of 4 to 1.0 poise was created. Boron nitride has a specific surface area of 110 m”/g and 2
40 m"/g was used. Composite ceramics similar to those in Example 1 were manufactured using this slurry, and ΔTc was investigated by the underwater quenching method. Figure 2 shows the results.
In the figure, * is a comparative example, which is an example of silicon nitride ceramics that did not contain boron nitride.
第２図にみられる如く、比表面積が１１０ｍ２／ｇおよ
び２４０ｍ”／ｇの窒化硼素は、５重量部以上配合させ
ると、複合セラミックス製品のΔＴｃは大幅に向上する
。As seen in FIG. 2, when boron nitride with a specific surface area of 110 m2/g and 240 m''/g is added in an amount of 5 parts by weight or more, the ΔTc of the composite ceramic product is greatly improved.
［実施例３コ
本発明者等は１粒度が０．６μ脂と１μ曙の市販の窒化
珪素粉と、比表面積が１００〜２５０ｍ”／ｇの窒化硼
素を用いて、実施例１で述べたと同じ形状の本発明の各
種の複合セラミックス製品を製造した。[Example 3] The present inventors used commercially available silicon nitride powder with a grain size of 0.6 μm and 1 μm, and boron nitride with a specific surface area of 100 to 250 m”/g, to achieve the results described in Example 1. Various composite ceramic products of the present invention having the same shape were manufactured.
その製造方法と、主な特性を第１表に示した。第１表に
みられる如く、本発明の複合セラミックス製品は、耐熱
衝撃性に優れるが、構造部材として必要な他の特性も十
分に満足するセラミックス製品である。The manufacturing method and main characteristics are shown in Table 1. As shown in Table 1, the composite ceramic product of the present invention is a ceramic product that has excellent thermal shock resistance and also satisfactorily satisfies other properties required as a structural member.
［発明の効果コ
本発明の複合セラミックス製品は、水中急冷法で測定し
た耐熱衝撃性（ΔＴｃ）が１２００℃以上で熱衝撃に強
いために、例えば自動車エンジン部品材料等の熱衝撃が
大きい環境で使用される部材として好ましい。[Effects of the Invention] The composite ceramic product of the present invention has a thermal shock resistance (ΔTc) measured by an underwater quenching method of 1,200°C or higher, and is resistant to thermal shock, so it can be used in environments with large thermal shocks, such as automobile engine parts materials. It is preferable as a member to be used.
本発明の複合セラミックス製品は、泥漿鋳込み法と常圧
焼結法とで製造できるために、形状が複雑な製品を製造
することが可能であり、製造コストも安いSince the composite ceramic product of the present invention can be manufactured using the slurry casting method and the pressureless sintering method, it is possible to manufacture products with complex shapes and the manufacturing cost is low.
第１図は窒化硼素の比表面とΔＴｃの関係の例を示す図
、
第２図は窒化硼素の配合量とΔＴｃの関係の例を示す図
、である。FIG. 1 is a diagram showing an example of the relationship between the specific surface of boron nitride and ΔTc, and FIG. 2 is a diagram showing an example of the relationship between the blending amount of boron nitride and ΔTc.
Claims (2)
して１００ｍ＾２／ｇ以上の比表面積を有する窒化硼素
５〜４５重量％と焼結助剤５〜３０重量％とからなり、
泥漿鋳込み法および常圧焼結法により製造したセラミッ
クス製品であることを特徴とする、複合セラミックス製
品(1) Consisting of 30-90% by weight of silicon nitride powder, 5-45% by weight of boron nitride having a specific surface area of 100 m^2/g or more as measured by the BET method, and 5-30% by weight of a sintering aid. ,
A composite ceramic product characterized by being a ceramic product manufactured by a slurry casting method and an atmospheric pressure sintering method.
して１００ｍ＾２／ｇ以上の比表面積を有する窒化硼素
を５〜４５重量％と焼結助剤を５〜３０重量％とを配合
し、水と分散剤を加えて粘度が５．０ポイズ以下の泥漿
を作成し、この泥漿を用いて泥漿鋳込み法および常圧焼
結法でセラミックス製品を製造することを特徴とする、
水中急冷法で測定した耐熱衝撃性（ΔＴｃ）が１２００
℃以上である複合セラミックス製品の製造方法(2) 30 to 90% by weight of silicon nitride powder, 5 to 45% by weight of boron nitride having a specific surface area of 100 m^2/g or more as measured by BET method, and 5 to 30% by weight of sintering aid. A slurry having a viscosity of 5.0 poise or less is prepared by adding water and a dispersant, and the slurry is used to manufacture ceramic products by the slurry casting method and the pressureless sintering method.
Thermal shock resistance (ΔTc) measured by underwater quenching method is 1200
Method for manufacturing composite ceramic products with temperatures above ℃
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2129267A JPH0426552A (en) | 1990-05-21 | 1990-05-21 | Composite ceramic product and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2129267A JPH0426552A (en) | 1990-05-21 | 1990-05-21 | Composite ceramic product and its manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0426552A true JPH0426552A (en) | 1992-01-29 |
Family
ID=15005353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2129267A Pending JPH0426552A (en) | 1990-05-21 | 1990-05-21 | Composite ceramic product and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0426552A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6159553A (en) * | 1998-11-27 | 2000-12-12 | The United States Of America As Represented By The Secretary Of The Air Force | Thermal barrier coating for silicon nitride |
-
1990
- 1990-05-21 JP JP2129267A patent/JPH0426552A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6159553A (en) * | 1998-11-27 | 2000-12-12 | The United States Of America As Represented By The Secretary Of The Air Force | Thermal barrier coating for silicon nitride |
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