JP3003491B2 - Ceramic firing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for firing ceramics.

[0002]

2. Description of the Related Art Conventionally, a mixture of a thermoplastic resin and a powder of a chemically inert material has been inserted between molded articles to prevent a reaction between ceramics during the firing of ceramics and to prevent sticking due to this reaction. Then, after the molded articles were bonded to each other, they were fired.

[0003]

In the above-mentioned conventional method, when the molded articles are fired side by side, the resin between the molded articles becomes non-uniform. And the properties of the fired ceramic sintered body are affected. For this reason, in the past, firing was performed by stacking vertically, but in that case, there was a problem that a large amount of molded articles could not be fired at once.

An object of the present invention is to solve the above-mentioned conventional problems, and it is an object of the present invention to enable a large number of compacts to be fired at once by allowing the compacts to be arranged side by side.

[0005]

[MEANS FOR SOLVING THE PROBLEMS] To achieve this object
The present invention provides a thermoplastic resin having a softening point on the surface of a molded article .
A mixture of resin and chemically inert powder coating or spraying, followed after heating the ceramic molded body above the softening point of the thermoplastic <br/> resin, solidification point of the thermoplastic resin wherein said chemically inert powder is cooled to below Se
Is fixed to the ceramic molded body, then, the plurality of molded bodies
Are stacked, and the superposed surfaces of the stacked molded bodies are arranged side by side in the lateral direction and fired.

[0006]

According to this structure, the above-mentioned inert powder can be baked.
Easily adheres to the surface of the compact without falling off
In this way, a plurality of compacts are stacked,
Can be fired side by side in a lateral direction, and a large number of molded bodies can be fired at once. In addition, since the surface of the molded body is uniform, the reaction between the molded bodies is suppressed, the peelability after firing is good, and the characteristics of the sintered body are not affected.

[0007]

An embodiment of the present invention will be described below.

First, a molded body was formed using a PTC thermistor element material (Formula 1).

[0009]

Embedded image

Then, polyvinyl butyrate (hereinafter referred to as PVB) is added to chemically inert ZrO at 5% by weight of ZrO.
Mixed. This is sprayed on one surface of the molded body or mixed with a very small amount of liquid such as water, and then applied, heated to 150 ° C. in a dryer, cooled to room temperature, and ZrO ₂ is applied to one side of the surface of the molded body. It was fixed.

The molded body thus obtained is shown in FIGS.
As shown, the deposited ZrO _TwoBetween the compacts 1
Stack 10 pieces vertically in the container 2
(A) Baking at 1300 ° C. Also do the same
3 and 4 are arranged side by side as shown in FIG.
Fired at 00 ° C.

For comparison, Z was used without using a thermoplastic resin.
As shown in FIGS. 1 to 4, 10 pieces of rO ₂ sprayed on the surface of the molded body 1 were stacked vertically (C) and 50 pieces were horizontally arranged (D) at 1300 ° C. Fired. And, a mixture of ZrO ₂ and thermoplastic resin PVB,
As shown in FIG. 1 and FIG. 2, a product simply applied to the molded body was stacked at 10 pieces vertically (E) and a piece of 50 pieces arranged horizontally (F) was fired at 1300 ° C.

The number of sinters that could not be peeled out of 100 sinters obtained in this way was determined as "the sticking of the sinters".
In addition, an indium-gallium alloy was applied to 100 sintered bodies, and the rate of change of the resistance value (R ₂₅ ) measured at a temperature (25 ° C.) was determined and is shown in Table 1.

[0014]

[Table 1]

As can be seen from Table 1, this embodiment is clear.
The ceramic according to (B) has good releasability of the sintered body, and also has little variation in resistance value.

In this embodiment, the PTC thermistor material is used as the molding material, and PVB is used as the thermoplastic resin.

The chemically inert powder may be not only ZrO ₂ but also an alumina powder or a ceramic powder after firing of the compact.

In this embodiment, ZrO ₂ is fixed only on one surface of the molded body. However, even if ZrO ₂ is fixed on the entire surface, the effect remains unchanged.

[0019] Even if the compact is packed in a container, the effect remains unchanged.

[0020]

As described above, according to the present invention, it is possible to fire a large amount of molded articles at a time. Further, it is possible to reduce a sintered body defect and a variation in resistance value.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view when ceramic molded bodies are vertically stacked in a container.

FIG. 2 is a top view when the ceramic molded bodies are vertically stacked in a container.

FIG. 3 is a cross-sectional view when ceramic molded bodies are arranged side by side in a container.

FIG. 4 is a top view when ceramic molded bodies are arranged side by side in a container.

[Explanation of symbols]

 1 molded body 2 container

Claims (1)

(57) [Claims] On the surface of the 1. A ceramic molded body, it has a softening point
After applying or spraying a mixture of a thermoplastic resin and a chemically inert powder to be heated, and then heating the ceramic molded body above the softening point of the thermoplastic resin, below the solidification point of the thermoplastic resin It was cooled to by fixing the chemically inert powder to the ceramic molded body, then the double
Number of compacts are stacked, and the polymerized surface of the stacked
A firing method for ceramics that is arranged side by side and fired.