JPS63233832A - Block for baking ceramic - 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] [Industrial Application Field] The present invention is directed to a method of preventing a sintering reaction between the plurality of sheet-like ceramic bodies when stacking and firing the plurality of sheet-like ceramic bodies. The present invention relates to a ceramic firing spacer interposed between ceramic bases to prevent the above.

[Conventional technology]

When stacking multiple sheet-shaped ceramic bodies and firing them, in order to prevent sintering reactions between the stacked ceramic bodies, conventionally A l z was done manually or mechanically.
03 powder, ZrO□ powder, etc. are spread between the ceramic substrates. However, such 1
120. When dispersing powder, etc., the dispersion lacks uniformity, causing problems such as a sintering reaction of the ceramic base occurring in some areas.

[Problem that the invention seeks to solve]

For this reason, sheets have been developed in which the above-mentioned A1t03 powder and the like are dispersed in paper or plastic. However, when the above-mentioned ceramic rough substrates are stacked with such a sheet interposed, misalignment may occur, or the sheet may shrink when the temperature rises, causing the sheet to disappear from the periphery of the ceramic substrate, and the sheets may not be stacked one above the other in that area. However, there are problems in that it is not possible to prevent sintering reactions between ceramic bases. Furthermore, when the temperature rises, the plastic melts, and the A11.03 powder partially aggregates due to capillary action with respect to the melt, resulting in problems such as unevenness on the surface of the ceramic product.

This invention was made in view of the above circumstances, and when stacking and firing a plurality of sheet-shaped ceramic bodies, the upper and lower ceramic bodies may be partially sintered or misaligned when stacked. The purpose of the present invention is to provide a spacing material for ceramic firing that does not cause unevenness or unevenness on the surface of a ceramic product.

[Means for solving problems]

In order to achieve the above object, the ceramic firing spacing material of the present invention is a layered ceramic firing spacing material that is interposed between the sheet-like ceramic materials when stacking and firing a plurality of sheet-like ceramic materials. , below (A)
~CC'') as the main component.

(A) Fine, high-melting-point inert material that does not melt at the firing temperature of the ceramic matrix.

(B) At least one of fine carbon and fine graphite.

(C) A binder for forming a layer together with (A) and (B) above.

That is, the above ceramic firing spacing material is AP203
Component (A), such as powder, and component (B), such as fine carbon, are solidified by component (C), which is a binder, to form a layered body, which itself has adhesive properties, so it can be used in the form of multiple sheets. When stacking ceramic substrates, the ceramic substrate adheres closely to the ceramic substrates and does not cause misalignment. Moreover, the above-mentioned (B) component and (C) component are combusted and gasified or ashed by heating at a predetermined temperature. Therefore, Al1
Only component (A) such as 203 powder remains between the ceramic bases. As a result, unlike the conventional Al2O, L powder dispersion sheet, there is no problem such as shrinkage when the temperature rises and the sheet no longer exists in the peripheral area, and the combustion gasification or ash of the component (C) mentioned above does not occur. (
B) Due to the presence of fine carbon etc. of component (A
) component Al! Agglomeration of os powder, etc. is prevented, and Al
1tO, powder, etc. are present between the ceramic bodies in a uniform state, which effectively prevents the sintering reaction between the ceramic bodies stacked one above the other, and after firing, 1tO, powder, etc.
You can easily take them out one by one.

The spacing material for ceramic firing of the present invention comprises a fine high melting point inert material (component A) that does not melt at the firing temperature of the ceramic base, one or both of fine carbon and fine graphite (component), and a binder (component C). It can be obtained using

The fine high melting point inert material (component A) that does not melt at the firing temperature of the ceramic bodies mentioned above is used to prevent a sintering reaction between the upper and lower ceramic bodies when firing the ceramic bodies stacked one above the other. , A1to3
．． Oxides such as ZrO□, nitrides such as 5t3N4, and high melting point metals such as W, Mo, Ti, and Ni are used. Such fine, high melting point inert materials are chemically bonded to ceramic substrates.

It does not cause any physical reaction or alteration.

The fine high melting point inert material of component A is in the form of powder or fine fibers, and in the case of powder, the average particle size is preferably 200μI or less, preferably 50μm or less. In the case of fine fibers, the fiber length is preferably 20m or less, preferably 30m or less, from the viewpoint of effectiveness.

Component B used together with component A is one or both of fine carbon and fine graphite. The shape of such fine carbon and fine graphite is not particularly limited. It may be in powder form or in fibrous form. Further, it may be in the form of a nonwoven fabric or a film. However, powder is usually used.

The binder for component C is used to solidify the components A and B to form a layered body, and includes rubber-based polymer materials, acrylic polymer materials, polyvinyl alkyl ether-based polymer materials, and the like. Examples of the rubber-based polymer substances include rubbers such as natural rubber, butyl rubber, polyisoprene rubber, styrene-butadiene rubber, and styrene-isoprene (or butadiene)-styrene terpolymer rubber. These are preferably adjusted to have adhesive properties. For example, 200 parts by weight of rubber (
20 to 300 parts of adhesion-imparting resin such as petroleum resin, polyterpene resin, rosin resin, xylene resin, coumaroindene resin,
A sticky rubber made by appropriately adding other softeners, anti-aging agents, colorants, fillers, etc. may also be used.

In addition, even when using only the above-mentioned rubbers themselves, the above-mentioned softeners, anti-aging agents, colorants, fillers, etc. are blended as necessary. Furthermore, examples of the acrylic polymer include those mainly composed of polyacrylic acid alkyl esters. Furthermore, examples of polyvinyl alkyl ether-based polymer substances include synthetic resin-based adhesive polymer substances represented by polyvinyl alkyl ether.

The respective proportions of the above A component, B component and C component are:
The settings are set as follows, taking into account the effects and other aspects. That is, the ratio of the A component and the C component is set to A component:C component=50 to 99:50-1 in terms of weight ratio. If the proportion of the C component exceeds the above-mentioned value, the proportion of the A component will be relatively low, and the effect of preventing the sintering reaction of the ceramic base may not be sufficiently obtained. On the other hand, if the proportion of C component is less than the above value, the strength of the ceramic firing spacing material itself will be weakened, making it difficult to handle.
; This is because fJ can be seen. Moreover, the mutual ratio of the above B component and C component is C component 2 B component = 90 ~ 2O:2O
~90. When the proportion of C component exceeds the above value, the proportion of B component becomes relatively low, and the aggregation prevention effect of component A tends to be insufficient. On the other hand, if the proportion of the C component is below the above range, the binder effect of the C component will be insufficient, and there will be a tendency that the ceramic firing spacing material will not form a layer.

The ceramic firing spacing material of the present invention can be manufactured using the above-mentioned raw materials, for example, in the manner described above. That is, the binder, which is component C, contains powdered, fibrous,
A desired spacing material for ceramic firing can be obtained by combining component A and component B in arbitrary shapes such as non-woven fabric, cloth, film, etc. by mixing, impregnating, coating, laminating, etc. In this case, when the A component and the B component are in the form of fibers, nonwoven fabrics, etc., impregnation and coating with a binder for the C component are performed. Generally, it is manufactured by mixing powdered or fibrous A component and B component materials with a binder for component C.

The material obtained in this manner is generally formed into a layered body with a thickness of 200 μm or less.

Another method for manufacturing the above-mentioned spacer for ceramic firing is a method of manufacturing a two-layer type, unlike the above-mentioned IN type. That is, plastic films made in a substantially unstretched state such as casting, flammable thin layer materials such as paper or cloth (thickness is 200 μm), etc.
By integrally providing a blended layer made of a mixture of the A, B, and C components on the (preferably less than m), it is possible to manufacture a ceramic firing spacing material having a two-layer structure.

In addition, as yet another method for manufacturing the spacing material for ceramic firing of the present invention, A
A three-layered ceramic firing process is performed by providing a layer of a fine high-melting-point inert material as a component, a layer of fine carbon powder, etc. as a component B, and a layer of a binder as a component C on top of that. There is a method of manufacturing spacers for

The ceramic firing spacing material obtained by any of the above-mentioned manufacturing methods exhibits the excellent effects described above.

The thus produced ceramic firing spacing material is used, for example, in the following manner. That is, the layered ceramic firing spacing material is adhered to the surface of a band-shaped ceramic base, and both are placed in a predetermined position. A predetermined number of pieces of the ceramic firing spacing material of the present invention are stacked so that they are interposed between the ceramic bases. Then, in an oxidizing or non-oxidizing atmosphere, at a temperature close to firing the ceramic base, for example, about 500 to 2000°C, for 30 minutes to 1 hour.
After heat treatment for 5 hours, the ceramic base is used to form a ceramic substrate.

〔Effect of the invention〕

Since the ceramic firing spacing material of the present invention is configured as described above, it comes into close contact with the ceramic bases when the sheet-shaped ceramic bases are stacked. Therefore, no misalignment occurs during stacking. Moreover, because the B component and C component are combusted and gasified or ashed by heating, the fine high melting point inert material force of the A component (remains uniformly) between the ceramic bases stacked on top of each other. In this case, the B component acts to prevent the agglomeration of the A component. Therefore, the agglomeration of the A component is prevented, and the uniform residual state of the A component is maintained. As described above, according to the spacing material for ceramic firing of the present invention, in order to effectively prevent the sintering reaction of the ceramic bodies stacked one above the other when stacking sheet-like ceramic bodies, It becomes possible to smoothly take out ceramic products one by one.

Next, the present invention will be explained based on examples.

[Example 1] A sticky binder was prepared by blending styrene-isoprene-styrene block copolymer rubber, 200 parts, rubber 1 system, and 5 parts of luphthalate. Next, 200 parts of graphite powder with an average particle size of 20 μm was blended with 200 parts of this sticky binder,
Further, 20 parts of ZrO□ powder having an average particle size of 30 parts m was blended and mixed uniformly, and a film was formed to a thickness of 50 μl to obtain a spacing material for ceramic firing.

[Example 2] Adhesive binder, graphite powder, and ZrO. The ratio of powder used was changed to 5 parts: 5 parts = 95 parts. Other than this,
A spacing material for ceramic firing was obtained in the same manner as in Example 1.

[Example 3] The proportions of the adhesive binder, graphite powder, and Zr0t powder were changed to 200 parts: 15 parts: 200 parts. Except for this, a spacing material for ceramic firing was obtained in the same manner as in Example 1.

Each of the ceramic firing spacing materials obtained in Examples 1 to 3 above was laminated onto an alumina ceramic sheet base having a thickness of 500 μm, cut into a size of 5 On + 50 m, and stacked 20 sheets with the spacing material inside. Ta. Then, this was heated at 1600°C in an oxidizing gas at 8°C.
It was heated and fired for a period of time. After the above firing, cool
When the obtained ceramic substrates were peeled off one by one, ZrO was present at the interface between the upper and lower ceramic substrates up to the end portion.
No blocking phenomenon was observed due to residual Z powder, and the ceramic substrate could be peeled off smoothly.

[Example 4] A blend was prepared by blending 200 parts of polyacrylic acid ester, 20 parts of terpene resin, and 80 parts of carbon with an average particle size of 20μ. Next, 15 parts of powder with an average particle size of 25 μ-〇 A 1 z (h) was added to 200 parts of this mixture, mixed uniformly, and coated on one side of a 30 μm thick unstretched polypropylene film to a thickness of 40 μm. A ceramic firing spacing material having a two-layer structure was obtained.Next, the ceramic firing spacing material obtained as described above was heated to a thickness of 800 mm.
The materials were laminated onto a μ-cut Cerumina ceramic sheet base, cut to a size of 2O0n+X2O0u, stacked, and fired at 1650° C. for 13 hours in an oxidizing gas.

When the ceramic substrate was cooled after firing and taken out, the interface between the upper and lower substrates had Al zO up to the end portion.
Since the S powder remained, no blocking phenomenon was observed, and the substrates could be smoothly taken out one by one.

Claims (3)

[Claims] (1) A layered ceramic firing spacing material interposed between the sheet-like ceramic bases during stacked firing of a plurality of sheet-like ceramic bases, which is one of the following (A) to (C).
) as a main component. (A) Fine, high-melting-point inert material that does not melt at the firing temperature of the ceramic matrix. (B) At least one of fine carbon and fine graphite. (C) A binder for forming a layer together with (A) and (B) above. (2) (A) component is Al_2O_3, ZrO_2, S
The ceramic firing spacing material according to claim 1, which is at least one material selected from the group consisting of i_3N_4, W, Mo, Ti, and Ni. (3) Component (C) is at least one selected from the group consisting of rubber-based polymeric substances, acrylic-based polymeric substances, and polyvinyl alkyl ether-based polymeric substances. The spacing material for ceramic firing according to item 2.