JPH1149557A - Colored porcelain sintered body and its manufacturing method - Google Patents

Abstract

(57) [Abstract] [Problem] Although much research has been done on the composition and manufacturing method of forsterite porcelain, most of them have been researches aimed at improving electrical characteristics and relatively large heat of forsterite porcelain. This is a development of the application that makes use of the swelling factor, and there is no example of giving a specific color tone or seeking an aesthetic texture. SOLUTION: To a raw material powder composed of 100 to 65% by weight of synthetic forsterite powder as a main raw material and 0 to 35% by weight of a sintering aid, nickel oxide as a coloring material or a nickel compound which becomes nickel oxide by firing is used. 0.
It is a colored porcelain sintered body in which the main constituent phase is made of a forsterite crystal phase (2MgO.SiO ₂ ) and the remainder is made of glass derived from a sintering aid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a colored ceramic sintered body and a method for producing the same, and particularly to a green-yellow-yellow-green material, such as a craft member, a decorative member, tableware, interior goods, a lighting device, or a member for a display device. The present invention relates to a colored porcelain sintered body and a method for producing the same.

[0002]

2. Description of the Related Art The origin of pottery is old and its origin is unknown, but it is said that pottery in Japan dates back more than 10,000 years. In the meantime, many ceramics including pottery have been made, and among them, porcelain with a lighter color and translucency than pottery and pottery was used in China during the Tang Dynasty (618-906) Born in Japan, it is said that it has the texture closest to jade among the things made by humans.

In modern times, porcelain is bright white, but since ancient times, porcelain has a blue-green color called porcelain which has been compared to balls or compared to balls. . Celadon is 1250 ° C to 1320 ° C in a furnace maintained in a reducing atmosphere with a glaze containing iron on the porcelain body
The color is developed blue by the iron dissolved in the glaze at the firing temperature, and a deep color tone of blue type to bluish green to green type can be obtained depending on the composition and thickness of the glaze and impurities contained in the base material.

[0004] Usually, in order to produce colored porcelain, there are a case where only the glaze is colored and a case where the porcelain base itself is colored. However, the color development by the base itself does not cause color unevenness.

[0005] In order to produce a porcelain whose base material has a bluish green color, for example, 5-20% of chromium oxide (Cr ₂ O ₃ ) is added as a coloring pigment to a well-purified white porcelain raw material and used as a porcelain clay. be able to. However, in order to produce a bluish-green color tone, the firing temperature must be suppressed to about 1200 ° C. If the firing temperature is higher than this, the base color takes on a gray color and becomes black as the firing temperature increases. Firing at about 1200 ° C is not enough to sinter porcelain.
Even if it is sintered, it does not achieve the original texture of porcelain that is dense, hard and beautiful.

In recent years, various types of fine ceramics have been manufactured, and some of them have various color tones. Among them, alumina ceramics can be developed into various beautiful colors by adding a small amount of oxides of various metals as disclosed in, for example, JP-A-63-239154, and have excellent strength. It is used not only for members but also as artificial jewelry in watches and ornaments.

For example, a raw material obtained by adding 1 to 3% by weight of nickel oxide to high-purity fine-powder alumina is molded, and the material is molded in a vacuum furnace.
A ceramic sintered at a temperature exceeding 00 ° C. becomes a light-transparent sky blue, but when it is refired at 1700 ° C. or more in air, the base material becomes a yellow-green to deep green ceramic.

However, fine ceramics use expensive high-purity raw materials, and require special atmosphere furnaces such as a vacuum high-temperature furnace for firing, and in some cases, this is fired again at high temperature. It develops a favorable color tone and texture, and if relatively large members such as tableware and crafts are made using such special raw materials and furnaces, the price required for production becomes extremely high, However, there is a problem that is significantly limited.

Against this background, the present inventor uses a ceramic sintered body having a bright green color tone in ordinary ceramic production without impairing the original solid, dense and beautiful texture of the ceramic. In order to manufacture it with equipment and furnaces, the minerals (crystals) that make up porcelain or new ceramics are widely investigated, and forsterite (2MgO.SiO)
₂ ).

[0010] Forsterite as a mineral has a high melting point of 1900 ° C and is excellent in fire resistance, and is therefore used as a furnace material (refractory ceramic) for steelmaking. In addition, porcelain made by sintering forsterite has excellent performance in the microwave region, so it can be used for high-frequency insulators, glass- and metal-sealed parts, thin-film resistors, and ICs.
It is used for electronic components such as substrates or IC packages.

[0011] Forsterite porcelain for electronic components presents a dark ivory (ivory) or ocher color tone,
Manufactured relatively inexpensively. As this raw material, "synthetic forsterite" powder is commercially available.

Many studies have been made on the composition and manufacturing method of forsterite porcelain, but many of them have been described in, for example, JP-A-5-262562 and JP-A-5-34.
Research aimed at improving electrical characteristics, such as increasing the insulating property to reduce high-frequency dielectric loss, as in Japanese Patent No. 5622, or using a relatively large coefficient of thermal expansion of forsterite porcelain as disclosed in Japanese Patent Application Laid-Open No. Hei 5-17859. There is no example in which the forsterite porcelain body itself has a specific color tone or seeks an aesthetic texture because it is a development of applications that make use of it.

The present inventor has been studying the coloring or coloring of the forsterite porcelain body, and has forged a pre-synthesized forsterite powder or a powder prepared so that the composition becomes almost forsterite (2MgO.SiO ₂ ). A sintering aid is blended into a porcelain raw material, and a composition containing 0.5 to 35% by weight of nickel oxide as a coloring agent is molded into the raw material, which is sintered in the air or in an oxidizing atmosphere. By making the porcelain body bright green-yellow
They have found that they can develop a yellow-green color tone, and have completed the present invention.

[0014]

The colored porcelain sintered body according to the first aspect of the present invention is a raw material comprising 100 to 65% by weight of synthetic forsterite powder as a main raw material and 0 to 35% by weight of a sintering aid. The main constituent phase is a forsterite crystal phase (added in an amount of 0.5 to 30% by weight of nickel oxide as a coloring material or a nickel compound which becomes nickel oxide by firing, in terms of nickel oxide). 2
MgO.SiO ₂ ), and the rest is made of glass derived from a sintering aid.

In this case, it is preferable that the raw material powder is composed of 95 to 65% by weight of synthetic forsterite powder as a main raw material and 5 to 35% by weight of a sintering aid.

According to a third aspect of the present invention, there is provided the method for producing a colored porcelain sintered body, wherein the synthetic forsterite powder 1 is used as a main raw material.
To a raw material powder comprising 100 to 65% by weight and 0 to 35% by weight of a sintering aid, nickel oxide as a coloring material or a nickel compound which becomes nickel oxide by firing is added in an amount of 0.5 to 50%.
30 wt% added in air or oxidizing atmosphere
Baking at a temperature of 00 to 1500 ° C.

According to a fourth aspect of the present invention, there is provided a method for producing a colored porcelain sintered body, wherein synthetic forsterite powder 1
A raw material powder comprising 100 to 65% by weight and 0 to 35% by weight of a sintering aid is fired at a temperature of 1100 ° C. or less to form a green body, and nickel oxide or nickel which becomes nickel oxide by firing is formed on the green body. Apply or permeate an aqueous solution of the compound, and place it in air or in an oxidizing atmosphere.
Baking at a temperature of 00 to 1500 ° C.

[0018]

The porcelain according to the present invention is composed of a forsterite crystal phase and a glass phase that binds it. Nickel oxide added to the porcelain raw material forms a solid solution in the forsterite crystal, which is the main constituent phase of the porcelain. The phase develops a greenish yellow to yellowish green color.

The nickel oxide itself is black. Nickel oxide added to glass is Ni ²⁺ coordinating 6 or 4
It is known that the coordination takes place, the glass is colored yellowish brown in the case of hexacoordination, and dark purple in the case of coordination, and the glass phase itself is considered to be yellowish brown in the present invention.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
In the colored porcelain sintered body according to the first aspect, synthetic forsterite powder is used as a main raw material. Commercially available synthetic forsterite powder, or magnesium compound powder which becomes an oxide by firing such as magnesia (MgO) or magnesium hydroxide (Mg (OH) ₂ ) or magnesite (MgCO ₃ ), talc (talc, 3MgO.4)
A raw material is used in which SiO ₂ · H ₂ O) powder or silica stone (SiO ₂ ) powder is blended so that the composition when fired is approximately ₂ MgO · SiO ₂ . In the latter case, if molded and fired, the forsterite mineral (2MgO.Si
O ₂ ) is synthesized and sintered as it is to form forsterite porcelain.

The synthetic forsterite powder is 100 to
Use 65% by weight. When the synthetic forsterite powder is more than 95% by weight (sintering aid is less than 5% by weight), sintering can be performed, but sintering requires a high temperature, and sintering at a practical firing temperature is required. From the practical point of view, it is desirable that the content be 95% by weight or less, since it becomes difficult to form a bond. Also,
When the synthetic forsterite powder as the main raw material is less than 65% by weight (the sintering aid is more than 35% by weight), sintering is easy, but softening and deformation tend to occur during sintering, and the shape is maintained. It becomes difficult to make porcelain as it is.

A sintering aid is blended to sinter the main raw material to form a porcelain. Usually, the sintering aid for ceramics is feldspar. Feldspar is also effective in forsterite porcelain. Further, a mixture of feldspar and a plurality of metal oxides or a mixture in which part or all of feldspar is replaced with colemanite (peridotite) are more effective.

The sintering aid is melted at the sintering temperature, and at this time, a part of the main raw material is also taken in and vitrified to bind the main raw material. In other words, it acts to promote sintering, but has a high viscosity when vitrified, shrinks while maintaining its shape as it is, and finally sinters to become porcelain. This sintering aid is used in an amount of 0 to 35% by weight in relation to the main raw material.

Forsterite porcelain is originally a pale yellow to ivory to cream-colored base material, but the raw material is nickel oxide or a nickel compound which becomes nickel oxide by firing is converted to nickel oxide in an amount of 0.5 to 30 outer weight. %, The porcelain body becomes greenish-yellow if it is baked, and becomes yellowish-green as the added amount increases, and becomes olive when it is further increased. However, if the added amount exceeds 30% by weight, black spots are mixed in the olive-colored base material, and sintering becomes difficult.

Next, an embodiment of a method for producing a colored porcelain sintered body according to claim 3 will be described. In the method for producing a colored porcelain sintered body according to claim 3, 100 to 65% by weight of synthetic forsterite powder as a main raw material and sintering aids 0 to 3 are used.
5 to 30% by weight of a raw material powder composed of 5% by weight of nickel oxide as a coloring material or a nickel compound which becomes nickel oxide by firing at a temperature of 1200 to 15500 ° C. in the air or an oxidizing atmosphere. Bake.

This porcelain can be fired using a furnace or an electric furnace using gas or kerosene as a fuel for firing ordinary porcelain. This is an essential condition for obtaining a yellow-green color tone. For example, when the porcelain of the present invention is sintered in a gas furnace in a slightly reducing atmosphere, the porcelain base is blackish and dark grayish green to dark grayish blue, which is not beautiful.

The sintering temperature may be 1200 to 1400 ° C., which is the usual sintering condition for porcelain when using a sintering aid, but 1400 to 1500 ° C. when no sintering aid is used.
It must be fired at the above high temperature. Even when a sintering aid is used, if the temperature is lower than 1200 ° C., sintering is not performed, green color is insufficiently developed, and the feeling of denseness is poor. Although the main constituent phase of the porcelain of the present invention is a high refractory forsterite mineral, when a sintering aid is used, the porcelain also contains a glass phase derived from the sintering aid. In this case, the porcelain softens and deforms at the same time as sintering, or adheres to the powder of the refractory material. Moreover, such a high firing temperature cannot be realized unless a high-temperature furnace for manufacturing fine ceramic products is used, and is not practical when manufacturing ordinary ceramics.

As described above, the main constituent phase is a forsterite crystal phase, and the remainder is composed of a glass phase derived from a sintering aid and the like, and rarely, a small amount of other crystals precipitated by the reaction thereof. ~ A ceramic sintered body having a beautiful yellow-green color tone and a fine texture can be obtained.

Further, in the method for producing a colored porcelain sintered body according to claim 4, the raw material powder comprising 100 to 65% by weight of the synthetic forsterite powder as the main raw material and 0 to 35% by weight of the sintering aid is used. Baked at a temperature of not more than ℃ to form an unfired body, and applying a nickel compound to the unfired body to become nickel oxide or nickel oxide by firing,
Baking is performed at a temperature of 1200 to 1500 ° C. in the air or an oxidizing atmosphere. In this case, the nickel oxide or the nickel compound which becomes nickel oxide by firing is applied by permeating and impregnating the unfired body with an aqueous solution of nickel oxide or the nickel compound. When formed in this manner, nickel oxide can be locally applied to develop color, and yellow-green decoration can be applied to only a part of the porcelain sintered body.

[0030]

【Example】

-Example 1-Synthetic forsterite powder (Kyorix M) as a main raw material
SI-B: Kyoritsu Ceramics Co., Ltd .: MgO / SiO ₂ ; 2.0
62, other Al ₂ O ₃ ; 1.78% by weight, CaO;
0.87 wt%, Fe ₂ O _3; 0.10 wt%) was used, feldspar sintering aid (Kanamaru feldspar F-1: Kyoritsu Ceramic Co. :( wt%): SiO _2; 68.78 , Al ₂ O
_{3; l6.84, Fe 2 O 3} ; 0.34, TiO 2;
0.04, CaO; 0.11, MgO; 0.07, K ₂
O; 9.76, Na ₂ O; 3.19, scalding; 0.41)
To a porcelain raw material in which 10% was blended, nickel oxide as a coloring agent was variously weighed and added, followed by casting and molding.
It was fired at 0-1400 ° C. to obtain a colored porcelain.

In the casting, 100 g of the raw material (main raw material + sintering aid), 43 ml of pure water, 2 ml of a dispersant (Despec A405) and 2 ml of a binder (acrylic emulsion type WA320) were weighed to prepare an automatic mortar. 4 using
The slurry was prepared by mixing for 5 minutes, the slurry was poured into a gypsum mold, and after about 3 hours, the mold was released, and the plate-like molded body was naturally dried for 2 days. The firing was performed by raising the temperature to a predetermined temperature from room temperature for 14 hours, maintaining the temperature for 0.5 hour, and decreasing the temperature by 300 ° C. for 3 hours to shut off the power.

When calcined at 1340 ° C., the ivory porcelain base becomes slightly greenish when 0.3% by weight of nickel oxide is added as a coloring material to the raw material, and pale yellowish green when 0.5% by weight is added. Becomes As the addition of nickel oxide was increased, the color tone of the porcelain gradually became darker, and became yellow-green when the addition exceeded 15% by weight. The base material to which 30% by weight of nickel oxide was added is a porous body without sintering and has a yellow-green color.

When calcined at 1400 ° C., the color tone of the porcelain became slightly darker. When 0.3% by weight of nickel oxide is added, the porcelain base becomes slightly green, and when 0.5% by weight is added, the color becomes pale yellowish green. As the amount of nickel oxide increases, the color becomes deeper. When the amount exceeds 30% by weight, the color becomes yellowish green, and when added outside 30% by weight, the color becomes olive yellowish green. Although sintering occurs even when the addition is 35% by weight, the color tone of the base material loses its brightness and small brown spots are mixed in the yellow-green base material, so that the addition amount is clearly excessive.

Example 2 Synthetic forsterite powder (Kyorix M) was used as a main raw material.
SI-B), and as a sintering aid, colemanite (obelites: colemanite carboron 200B: Kyoritsu Ceramics Co., Ltd .: composition (% by weight): B ₂ O ₃ ; 36.27, Si
_{O 2; 6.37, A1 2 O} 3; 0.18, Fe 2 O 3;
0.08, CaO ₂ ; 26.01, MgO; 2.57,
_{Na 2 O; 0.31, K 2} O; 0.31, SrO; 1.
Example 1 was prepared by adding nickel oxide as a coloring material to a porcelain raw material containing 6% by weight of 45, As ₂ O ₃ ; <0.01).
Casting was performed in accordance with the method described above, and firing was performed at 1260 ° C. to obtain a colored porcelain sintered body.

The porcelain baked at 1260 ° C. is a yellowish cream porcelain without a coloring material and contains a glass phase derived from colemanite in the base material, but 0.5% by weight of nickel oxide is added as a coloring material. Then, the color becomes slightly greenish yellow, and becomes pale yellowish green when added by 1 wt%.
As the addition of nickel oxide was increased, the color tone became deeper. The addition of 30% by weight of nickel oxide resulted in an olive-yellowish greenish color, and the addition of 35% by weight resulted in a sober brownish light greenish color with excessive addition. is there.

Example 3 A synthetic forsterite powder (Kyorix M) was used as a main raw material.
Using SI-B), a sintering agent was not added, and nickel oxide was added as a coloring material while changing the amount. A porcelain was obtained by casting and firing according to Example 1.

Since Kyorix MSI-B has a high fire resistance and does not sinter unless it exceeds 1400 ° C. without using a sintering aid, firing is performed at 1460 ° C. using a high-temperature electric furnace.
Performed in

When baked at 1460 ° C., a ivory porcelain is thinner if a raw material to which no coloring material is added is used.
When 0.3% by weight of nickel oxide is added as a coloring material, the porcelain body becomes slightly greenish, and yellowish green becomes darker as the amount of nickel oxide added increases. Since the composition used here does not contain a sintering aid, the glass phase in the porcelain is small, and therefore, the color of the glass phase hardly affects the color tone of the porcelain.

When 0.5% by weight of nickel oxide is added to the raw material, the porcelain exhibits a light greenish yellow, and when 2% by weight is added, the porcelain exhibits a light yellowish green. The change in color tone becomes slower when the amount exceeds 9% by weight. Addition of 30% by weight slightly gives an olive color, and addition of 35% by weight adds 14%.
Sintering at 60 ° C. stopped sintering.

146 parts by weight of nickel oxide were added at 35% by weight.
When the crystal structure of the pale green porous body tinged with light brown fired at 0 ° C. was examined by X-ray diffraction, Mg ₂ SiO ₄ (forsterite) and a small amount of NiO (nickel oxide) were detected. When the crystal structure of the slightly greenish yellow-green sintered body was examined by X-ray diffraction after adding 30% by weight of nickel oxide, Mg ₂ SiO ₄ and a trace amount of NiO were detected. When the crystal structure of the yellow-green sintered body to which 25% by weight of nickel oxide was added was examined by X-ray diffraction, only Mg ₂ SiO ₄ was detected. The reason that this porcelain develops a green color when nickel oxide is added is presumed to be that the forsterite crystal, which is a main constituent phase of the porcelain, dissolves nickel oxide to give a green color.

Example 4 55 parts of reagent magnesia (MgO) and 45 parts of high-purity fine silica powder (fine silica powder SP-3: Kyoritsu Ceramics Co., Ltd .: composition (about ₂ MgO · SiO ₂ ) % By weight): S
iO ₂ ; 99.75, Fe ₂ O ₃ ; 0.01, A1 ₂ O
₃ ; 0.01; scuffing; 0.08) were mixed and used as the main raw material. To the porcelain raw material to which 8% by weight of feldspar (Kanamaru feldspar F-1: Kyoritsu Ceramics Co., Ltd.) was added as a sintering aid, 4% by weight of barium carbonate and 8% by weight of calcium carbonate, nickel oxide was added as a coloring agent. 4. Then, the mixture was pulverized and mixed in an automatic mortar to form a slurry, followed by casting. After drying, firing was performed using an electric furnace to obtain porcelain.

The green body obtained by firing and sintering the molded body at 1260 ° C. showed a yellow-green color. When this fragment was subjected to X-ray diffraction, Mg ₂ SiO ₄ crystals and a small amount of unidentified crystal phases were detected as main constituent phases.

When the firing temperature was increased to 1400 ° C., a dark yellow-green porcelain was obtained. X-ray analysis of this fragment revealed that
Only Mg ₂ SiO ₄ was detected as crystals.

Example 5-talc (talc: composition (% by weight): SiO ₂ ; 61.6;
_{A1 2 O 3; 1.6, Fe} 2 O 3; 0.9, CaO;
0.8, MgO _3; 30. 4.9), and an experiment was conducted using magnesium carbonate as a reagent.

A mixture of 61 parts of magnesium carbonate (MgCO ₃ ) powder and 39 parts of talc (talc: 3MgO.SiO ₂ .H ₂ O) powder was used as a main raw material so that the composition became approximately ₂ MgO · SiO ₂ . . Since this raw material contains a large amount of bulky magnesium carbonate, it is difficult to cast and mold the raw material as it is.

First, this mixture was placed in a heat-resistant porcelain crucible and calcined at 150 ° C. in an electric furnace to completely turn into an oxide (the weight was reduced to 65%). 80 parts of this were mixed with 2 parts of feldspar as a sintering aid, 8 parts of perovskite and 10 parts of barium carbonate, pulverized well with an automatic mortar, and added with 10% by weight of nickel oxide as a coloring agent. The mixture was slurried and cast. After drying, the molded body was fired at 1220 ° C. using an electric furnace to obtain porcelain.

The green body fired and sintered at 1220 ° C. was yellow-green. When the firing temperature is increased, the color tone of the porcelain becomes slightly darker. Since this composition contains a large amount of glass phase, 1360 ° C.
The bedding had adhered during firing, but it turned into a yellowish-green porcelain that was moist and wet.

When this fragment was subjected to X-ray diffraction, only Mg2SiO4 was detected as crystals, but 2θ = 10 °-
The background swell was remarkable up to 40 °, indicating that there was much glass derived from the sintering aid.

Example 6 Synthetic forsterite (Kyorix MSI) was used as a main raw material.
Using B), a porcelain material containing 8% by weight of gold feldspar as a sintering aid, 4% by weight of barium carbonate and 8% by weight of calcium carbonate is molded and baked, and a 50% aqueous solution of nickel nitrate is used as a coloring agent. After impregnating, drying and calcining to oxidize the colorant, the colorant was weighed again to determine the amount of nickel oxide contained in the unbaked green body. 1% by weight.

This is fired at 1260 ° C. and sintered,
A porcelain exhibiting a yellow-green color was obtained. When the firing temperature was further increased, the porcelain became deeper in color. At 1,400 ° C. firing, slight spreading of powder was observed, but the porcelain became a moist wet yellow green base.

Example 7 Synthetic forsterite (Kyorix MSI) was used as a main raw material.
-B), 8% by weight of golden feldspar + 4% by weight of barium carbonate + 8% by weight of calcium carbonate as a sintering aid, and nickel oxide as a coloring agent. After casting, the mixture was baked at 1260 ° C. using an electric furnace to obtain a yellow-green colored porcelain. The color tone is similar to Example 6.

As in the previous experiment, the porcelain also became darker in color when the firing temperature was increased, and when baked at 1400 ° C., light litter adhered to the porcelain, giving a wet yellowish green base.

Example 8 Synthetic forsterite (Kyorix MSI) was used as a main raw material.
-B), 8% by weight of golden feldspar + 4% by weight of barium carbonate + 8% by weight of calcium carbonate are blended as a sintering aid, and as a coloring agent (equivalent to 4.1% by weight in terms of nickel oxide) ) nickel carbonate _{(NiCO 3 · 2Ni (OH)} 2 ·
4H ₂ O) was added in an amount of 20.7% by weight, and after casting, the mixture was fired at 1260 ° C. using an electric furnace to obtain porcelain colored yellow-green. The color tone is similar to the colored porcelain sintered bodies of Examples 6 and 7.

The porcelain also became darker in color when the firing temperature was increased as in the above embodiment, and when baked at 1400 ° C., light litter adhered to the porcelain, giving a wet yellowish green base material.

By comparing Examples 6 to 8, a nickel material was added to the forsterite porcelain raw material in the same amount in terms of nickel oxide, and calcined at the same temperature. Was found to have an approximate color tone.

[0056]

As described above, in the colored porcelain sintered body according to the first aspect, nickel oxide as a coloring material or a nickel compound which becomes nickel oxide by firing is converted to nickel oxide by 0.5 to 30%. By adding an equivalent amount by weight, the porcelain sintered body with a bright green color tone on the substrate itself without impairing the original hard, dense and beautiful texture of porcelain is realized by the equipment and furnace used in normal porcelain production can do. In addition, in this colored porcelain sintered body, the cost required for production can be reduced by using a mixture that becomes a forsterite mineral by firing instead of a pre-synthesized forsterite raw material as a main raw material of the porcelain. it can. Furthermore, instead of expensive nickel oxide, instead of expensive nickel oxide, a relatively inexpensive compound can be selected from a wide range of compounds that become nickel oxide by firing, so that manufacturing costs can be reduced. it can.

Further, in the method for producing a colored porcelain sintered body according to claim 3, the raw material powder comprising 100 to 65% by weight of the synthetic forsterite powder and 0 to 35% by weight of the sintering aid as main raw materials is Nickel oxide as a coloring material or a nickel compound which becomes nickel oxide by firing
In the atmosphere or in an oxidizing atmosphere 1
Since firing at a temperature of 200 to 1500 ° C.,
It becomes a forsterite sintered body exhibiting a yellowish green color, and becomes a colored porcelain sintered body that can be suitably used for a craft member, a decorative member, tableware, interior goods, a lighting device, a member for a display device, or the like.

Further, in the method for producing a colored porcelain sintered body according to claim 4, the raw material powder comprising 100 to 65% by weight of the synthetic forsterite powder as the main raw material and 0 to 35% by weight of the sintering aid is used. Baked at a temperature of not more than ℃ to form an unfired body, and apply or permeate an aqueous solution of nickel oxide or a nickel compound to be turned into nickel oxide by firing, at a temperature of 1200 to 1500 ° C. in the air or an oxidizing atmosphere Since it is fired, it is possible to locally decorate the forterite porcelain and develop a greenish yellow to yellowish green color, and it is suitable as a craft, decorative member, tableware, interior goods, lighting equipment, or display device member Can be used.

Continuing from the front page (72) Inventor Kenichi Nagata 1-1, Yamashita-cho, Kokubu-shi, Kagoshima Prefecture Inside the Kyocera Corporation Kagoshima Kokubu Plant

Claims (4)

[Claims] 1. A raw material powder comprising 100 to 65% by weight of synthetic forsterite powder as a main raw material and 0 to 35% by weight of a sintering aid, nickel oxide as a coloring material or a nickel compound which becomes nickel oxide by firing. Was converted to nickel oxide in an amount equivalent to 0.5 to 30% by weight and calcined, and the main constituent phase was a forsterite crystal phase (2M
gO.SiO ₂ ), the remainder being a glass sintered body made of glass derived from a sintering aid. 2. The raw material powder is composed of 95 to 65% by weight of synthetic forsterite powder as a main raw material and 5 to 35 sintering aids.
2. The colored porcelain sintered body according to claim 1, comprising: 3. A nickel powder as a coloring material or a nickel compound which becomes nickel oxide by firing to a raw material powder comprising 100 to 65% by weight of synthetic forsterite powder as a main raw material and 0 to 35% by weight of a sintering aid. To 0.
A method for producing a colored porcelain sintered body which is added at 5 to 30% by weight and fired at a temperature of 1200 to 1500 ° C. in the air or an oxidizing atmosphere. 4. A raw material powder composed of 100 to 65% by weight of synthetic forsterite powder and 0 to 35% by weight of a sintering aid as main raw materials is fired at a temperature of 1100 ° C. or less to form an unfired body. A method for producing a colored porcelain sintered body in which an uncoated body is coated or impregnated with an aqueous solution of nickel oxide or a nickel compound which becomes nickel oxide by firing, and fired at a temperature of 1200 to 1500 ° C. in the air or an oxidizing atmosphere.