JPS5935063A - Manufacture of dressing ceramics - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a method for producing decorative ceramics having golden shine in spots or patterns on a ceramic base.

Recently, sintered bodies made of carbide or nitride with a golden shine have been attracting attention as decorative parts for watch cases, lighter cases, tie pins, etc. This decorative material is undergoing a change. Because there is no single color, there is a lack of tones other than gold, making it feel lacking. On the other hand, natural stones such as Ravi Rajuri, which have a golden color as well as group blindness, have a rich variety of color tones compared to the monochromatic golden ornamental shrines, and have individuality depending on the degree of golden coloration and dispersion state. Because it has a certain color, it cannot be used as a tasteful decorative member.

However, there are very few natural stones in nature that have a golden shine like Ravi Rajuri, and for this reason,
There is a strong desire for decorative members such as Lavis Radieli, in which the golden shine gives off a tasteful appearance along with other tones.

The present invention was developed in view of the above-mentioned circumstances, and it is an object of the present invention to provide a method for producing decorative ceramics having golden shine in spots or patterns on a colored ceramic base.

According to the present invention, Ti is added to the base material mainly composed of alumina.
N, TiC, ZrN, 'll'aN, H
Powder containing at least one type of fN, pA grains, crushed pieces, etc. are mixed, molded, and then the molded body is sintered to provide decorative ceramics with a golden shine. Various pigments are added to the base material to enhance its golden shine and provide decorative ceramics of various hues.

The manufacturing method of the present invention uses surface-purity alumina powder as the main raw material, and uses UoU as necessary along with a sintering aid such as MgU.
,,)(,irg(Js, MnUs, Fe2(
Add well-known pigments such as Js and NiU, and further '
1'iN, i'aU, ZrN.

The process consists of mixing powders, granules, crushed pieces, etc. containing at least one type of 1'aN, yoN-stylus (hereinafter collectively referred to as the golden component), then molding this mixed powder, and then sintering it. .

In this manufacturing method, the pigment may be added in an appropriate amount depending on the degree of coloration of the alumina base 1, and is usually mixed in an amount of 0.1 to 10 percent by weight of the alumina powder.

The golden component is i'+N, ZrN,
Nitride such as i'nN, HfN, or '1'n
The main phase is at least one type of carbide such as G, 'I'
1L(z, Sai, &In, Mo2C
A type of soil with a slight slope such as 2 is mixed into the soil material as a binder by a few percent. The golden color tone varies depending on the amount of binder added and the type, but generally speaking, if the metal content in the binder is small,
*Produces a golden color with a strong color tone.

If the golden component is in the form of a fine powder, a fine golden shine is added to the color tone of the alumina base.

Furthermore, if the golden component is in the form of granules, gold spots will appear on the aluminum substrate. Furthermore, the sintered body of the golden component may be crushed and crushed pieces may be mixed therein.

In addition, in order to give the golden shine a natural feel similar to that of natural stone, it is preferable to vary the particle size of the golden component.

Sintering of the compact of mixed powder of alumina, coloring component, and golden component is carried out in a reducing atmosphere at a firing temperature of about 1,500 to 1,900°C, whereby the alumina base is colored by the pigment component, and the gold component is also golden. This results in a decorative member with a variety of colors.

Next, the present invention will be explained in detail with reference to Examples.

[Example 1] High purity alumina powder, MgU powder as a sintering aid,
Pigment Toshite (jo (J, Crp, Us, M
Add a total of 20% powder of n(l and FoQ's,
After wet grinding, it was dried.

A sample containing 6% paraffin wax and passed through an 80-mesh mesh was prepared. Ten tons of paraffin wax was added to the missing i'iN powder, passed through 40 meshes, and the powder was mixed with the previously prepared alumina-based powder by adding 3%. σ〕Mixture】000h/mouth 2
The product was molded into a desired shape, the binder was removed in a vacuum furnace at 300°C, and the final firing was performed in a vacuum furnace at 1650°C.

When the sintered body thus obtained was subjected to #A blood 11w'',
There are small golden spots scattered on the horse base.

[Example 2] Similar to Example 1, high purity alumina powder powder MgO, C
o(), Ur9U3, Mn()g and Fe2
011 powder was added thereto, wet-pulverized, dried, and mixed with powdered fine wines.The resulting mixture was passed through a master. Add paraffin wax with a buoyancy of 1 l to the fine powder of missing number HI'N, and add it to the alumina-based powder prepared earlier.
Mixed. This mixture was fired in the same manner as in Example 1.

When this sintered body was mirror-polished, a golden σ] shine appeared as minute spots on the black base.

[Example 3] To high-purity alumina powder, sintering aid 'MgO powder and pigment Cr1 (J3 powder) were added to 3Φ, and after wet grinding, it was dried. To this, 6% paraffin wax was added. I prepared one that had been passed through 80 mesh.
Paraffin wax was added in an amount of 10% to eye powder, and the powder passed through 40 meshes was added in an amount of 2% to the previously prepared alumina-based powder and mixed. 1000 ml of this mixture
The product was molded into a desired shape using KJ2/c1M2, the binder was removed in a vacuum furnace at 300°C, and the product was fired in a vacuum at 1850°C using a single trowel.

When this sintered body was mirror-polished, small golden spots were scattered on the red base.

[Example 4] In the same manner as in Example 3, powders of Mg (J and Ur9 (J3) were added to high purity alumina powder, wet-pulverized, dried, paraffin wax was added, and the mixture was passed through starvation. Next, crushed pieces of a sintered body made of ZrN (particle size approximately 0.1 to 1
0) to the alumina-based powder prepared earlier,
Mixed. This mixture was fired in the same manner as in Example 3.

When this sintered body was mirror polished, golden spots and patterns were observed on the red base.

[Example 5] A sintering aid of Mg (J powder) was added to high-purity alumina powder in an amount of 0.
2% was added, wet milled, and then dried. 6% of paraffin wax was added to this, and an 8o mesh was prepared.Next, 10% of paraffin wax was added to the
% and passed through 40 meshes was added in an amount of 1% to the previously prepared alumina main component powder and mixed. This mixture was molded into a desired shape at 100°KJ (/cm2), the binder was removed in a vacuum furnace at 300'C, and the mixture was heated at 1800°C.
Main firing was performed in a vacuum furnace at ℃.

When this sintered body was mirror polished, small golden spots were found scattered on the white base.

[Example 6] In the same manner as in Example 5, Mg (J powder was added to high-purity alumina powder, wet pulverized, and after drying, paraffin wax was added and passed through starvation to prepare.
Paraffin wax was added to the powder No. 3, and the powder passed through 40 meshes was added to the alumina-based powder prepared previously and mixed. This mixture was fired in the same manner as in Example 5.

When this sintered body was mirror polished, small golden spots were found scattered on the white base.

[Example 7] To high-purity alumina powder, 3% of the sintering aid Mg (J powder) and the pigment (J powder) were added, wet-milled, and then dried. Paraffin wax was added to this. 6% was added and passed through 80 meshes to prepare semi-6iii.

Next, 10% paraffin wax was added to the "l'iN powder, and the powder passed through 40 meshes was added to 1% of the alumina main component powder prepared earlier and mixed. This mixture was mixed at 1000 kg/α2 Molded into desired shape at 30
The binder was removed in a vacuum furnace at 0°C, main firing was performed in a vacuum furnace at 1850°C, and further firing was performed in an oxidizing atmosphere furnace at 1000°C.

When this sintered body was mirror polished, small golden spots were found scattered on the base.

[Example 8] Similar to Example 7, MgU and C were added to high purity alumina powder.
oOθ] Add powder, wet grind, dry, add paraffin wax, pass through a sieve, and prepare. Next, add paraffin wax to the fine powder of 'l'aN t7
The alumina-based powder prepared earlier was added and mixed. This mixture was fired in the same manner as in Example 7.

When this sintered body was mirror-polished, golden spots appeared uniformly on the surface as minute spots.

As is clear from the tenth embodiment, the alumina base material is
(J (1 (J , Ur2U30Mn (J9 and (J ke
When 9(J3 (7) pigment powder was added, it became a dotted color, and when nir2(J8 powder was added, it became red, and when no pigment was added, it became white.

However, as in Example 7.8, when Co(J powder is used to make the alumina base blue), l1liN, 'l' RN, or U(1(J) reacts with the alumina under the reducing atmosphere of vacuum furnace firing. It becomes a reduced state, and the alumina matrix changes silently.
I couldn't get a blue base. Therefore, the present inventor continued to re-fire this sintered body in an oxidizing atmosphere furnace to oxidize the above-mentioned reduction products to Ti(J+, 'l'a9UF3), and as a result, the alumina matrix turned blue due to the color development of UoU. It was very successful.

The firing humidity of the oxidizing atmosphere furnace is about 500 to 120.
At temperatures above about 500 DEG C., the nitrides or carbides are all oxidized, and the golden component no longer shows any gold color.

It was confirmed through experiments that firing in a reducing atmosphere - oxidation, and firing in an ambient atmosphere are necessary for the pigment Nyama.

Thus, the decorative ceramic produced by the method of the present invention
The color of the alumina material was decided depending on each person's preference, such as the particle shape of the golden component, the inclusion of the gold component, and the color of the alumina material. I've been able to find some interest in it.

Historically, this decorative ceramic is inferior to the natural stone Ravi Rajuri, and since it can be supplied at a low price due to ceramic production techniques, it has become possible to supply highly marketable decorative materials. fj “Ivy.

Applicant: Kyoto Ceramic Co., Ltd. Representative Kazuo Ina Mori 394-

Claims (2)

[Claims] (1) TiN on a base material mainly composed of alumina. i'a(j, ZrN, TaN, l1f
A method for producing decorative ceramics, which comprises mixing powders, granules, crushed pieces, etc. containing at least one type of N, etc., molding, and then sintering the molded body. (2) The method for producing decorative ceramics according to claim 1, wherein the base material containing alumina as a main component contains a pigment.