JPS5888190A - Non-oxide 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] This investigation is related to the non-oxidized #IIJ yarn mix, and can be summarized as follows. To reduce the curvature due to sharp scratch resistance and fracture as a sintered body - to improve straight pipe rounding, the non-fog based ceramics after the cutting process are applied to the ceramic coating layer on the surface of the body. It is a round of non-oxide ceramics characterized by having a reduced formation δ.

Ceramics are inherently brittle materials, and tend to break without forming well.

When cracks occur due to defects such as pores, impurities, and defects in ceramics, the cracks do not stop growing under the same stress condition, and therefore lead to failure.

In other words, the degree of stress induced by defects in the ceramic determines the strong WK of the ceramic.

In addition, under the general usage conditions of ceramic structures, the surface of the ceramic often becomes hard to form, and this is because defects such as pores and holes on the second side of the structure dominate the strong wrinkles of the structure. This leads to this.

Since the hardness of Ichika ceramics is very high, the final finishing process is done under the control of general 1C ore. For this reason, sharp edges tend to remain on the next surface, and this is the biggest defect that reduces mechanical fracture strength.

In order to eliminate the above-mentioned defects in the processing of non-modified yarn ceramic charcoal bodies, the present authors worked with woodworkers, and as a result, sharp scratches tμ remained on the processed surface of non-modified ceramic yarn bodies. It was discovered that if a ceramic coating layer is formed on the surface and it is eliminated or smoothed by K, the degree of stress concentration can be reduced, and thereby the variation in the strength of broken noodles on the surface can be reduced.90. .

The invention will now be described in detail.

In the invention, in order for the ceramic coating layer to be removed on the surface of the non-oxidized ceramic sintered body to achieve the above object, (1) the m-axis body and the ceramic coating layer; Good adhesion (the ridges of the 2J m shaft and the ceramic coating layer are close to each other) is a sign of pseudo-wood leakage.

This is because (1) the coating effect cannot be exhibited unless the ceramic coating layer and the sintered body are placed in a continuous M stress field, and (2) the coating mt-formation is What about the non-oxidized ceramic sintered body? This is to prevent thermal stress from occurring in the outer enclosure when exposed to a warm atmosphere.

From the above point of view, it is preferable to use the same coating material for forming the coating layer as the material used to form the non-oxide ceramic sintered body.

However, if thermal stress is not an issue, both must be 10.
-Not! Even if it is a yuzu material, it will not support the residue.

Therefore, if the non-commercial ceramic km body used in this % light is made of 5ilN, SiC, etc., the coating material may be 513N4, blC or M2O3.
Ceramics such as these are pigeon stops.

To coat the sintered body with such a coating, 2a1 cvDa, plasma CVD method, Pv
Any coating method such as the D method may be used, but since the tightness between the sintered body and the coating Me becomes X-dimensional, from this point on, it is necessary to use a certain extreme temperature, for example, 800℃ or higher. It is preferable to coat the film using a chemical vapor deposition method, and from the viewpoint of throw-through properties, a CVD method is also preferable.

Furthermore, in order to further improve the adhesion, it is possible to sinter it by heat treatment after the above-mentioned coating, or to add a sintering aid such as MgO1Y203 to the sintered body 01111 before coating. Alternatively, the sintered body may be coated with a similar oxide as a binder, and then coated with the same material as the sintered body, followed by heat treatment.

If the thickness of the ceramic coating layer formed in this way is too thick, the uniformity of the coating layer will be low, making it easy for turtle kk growth to occur from the coating layer, making it impossible to obtain the effect of forming coating layers. A bird of 8μ or less is an additional tooth.

The non-oxide ceramic sintered body may be produced by any method such as normal pressure sintering, hot press sintering, or reaction sintering.

Next, the present invention will be explained in detail using an example of contamination.

After grinding the surface IID of the INJ arm shaft body obtained by normal pressure sintering or hot press sintering, and the SiC sintered body using a 4400 diamond grindstone, it is then processed using CVD or plasma CVDK.
The ceramics were coated with BN4, StCs, Al2O□, and the transverse rupture strength and Wipul coefficient of the obtained ceramics were measured, and the coating conditions and tsumugi constant supply were all 6K.

Table 1 Note: Mu6 is 5sjN414 compact t◆40 by pressureless sintering
0 diamond stone is sharpened by MgO as pine dart so
'1CV1) 0° at 1000°C Mt coated Si, N4kCVDm at 1000°C
．． 5μ structure coating, 7Q sacrifice N, medium V (Te170
It was heat treated at 0C for 80 minutes.

h: Non-enemy compound type mix with ceramic coating tm t w on the surface in & Karakori invention mm
Excellent results have been achieved in vi.

Patent Applicant: Sumitomo Electric Industries, Ltd. Agent: Patent Attorney Kazu 1) Continuation of page 1 0 Inventor: Komura Shuu Itami Works, Sumitomo Electric Industries, Ltd., 1-1-1 Konyo Kita, Itami City

Claims (1)

[Scope of claims] Oxide thread ceramics 0 (2) Non-oxide ceramics according to claim aiii characterized in that the non-oxide ceramics are electrified silicon. (3) The non-oxide ceramics are electrified silicon. Claims characterized in that the material is silicon carbide Non-saleable yarn ceramics of the first mass arrangement. Claims characterized in (4) - that the ramix coating material is silicon carbide. The non-oxide ceramic according to claim 1, characterized in that the ceramic coating material is silicon carbide. Claims 1. A non-metallic ceramic having a first lump structure, which is coated with alumina and coated with 4F mold.