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Method for producing oriented ceramic sintered body and flat sheet

A technology for sintered body and ceramics, which is applied to the production method of oriented ceramic sintered body and the field of flat sheets, and can solve problems such as cracking of adhesive spacers.

Active Publication Date: 2022-07-19
NGK INSULATORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, since the sample and the spacer are in direct contact, there is a problem of reaction between the sample and the spacer, adhesion, or rupture of the spacer

Method used

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  • Method for producing oriented ceramic sintered body and flat sheet
  • Method for producing oriented ceramic sintered body and flat sheet
  • Method for producing oriented ceramic sintered body and flat sheet

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0035] 1. Production of alumina sintered body

[0036] (1) Production of alumina molded body

[0037] 0.5 parts by mass of commercially available tabular alumina powder (YFA10030, manufactured by KinseiMatec Co., Ltd., average particle size 10 μm, average thickness 0.35 μm, aspect ratio 29) and fine alumina powder (TM-DAR, average particle size 0.1 μm) were mixed , Daming Chemical Co., Ltd.) 99.5 parts by mass to prepare mixed alumina powder. When the mass ratio of the tabular alumina powder and the fine alumina powder is represented by T:(100-T), T=0.5. With respect to 100 parts by mass of the mixed alumina powder, 0.0125 parts by mass (125 mass ppm) of magnesium oxide (500A, manufactured by UbeMaterials), and polyvinyl butyral (product number BM-2, Sekisui Chemicals) as a binder were added Industrial product) 7.8 parts by mass, 3.9 parts by mass of di(2-ethylhexyl) phthalate (manufactured by Kurogen Chemicals) as a plasticizer, sorbitan trioleate (Rheodol SP) as a dispersa...

experiment example 2

[0061] In Experimental Example 2, commercially available tabular graphite powder (SGP-3, SEC carbon, average particle size 3 μm) was used. Except for this, an alumina sintered body was produced in the same manner as in Experimental Example 1. The molded sheet of Experimental Example 2 had a maximum cross-sectional height Pt of 0.378 μm and a void ratio of 51.6% (see Table 1 below). In addition, the XRC·FWHM of the outermost surface of the alumina sintered body was 2.1°, and the XRC·FWHM of the surface (inside) after grinding to 100 μm was also 2.1° (see Table 1 below). Thus, the obtained alumina sintered body is an oriented alumina sintered body, and the crystal orientation of the surface of the alumina sintered body is the same as the crystal orientation of the interior.

experiment example 3

[0063] In Experimental Examples 1 and 2, commercially available graphite powder was used as the raw material for the molded sheet, but in Experimental Example 3, commercially available boron nitride (USP-S2, manufactured by Showa Denko, average particle size 0.6 μm) was used instead. . Except for this, an alumina sintered body was produced in the same manner as in Experimental Example 1. The molded sheet of Experimental Example 3 had a maximum cross-sectional height Pt of 0.413 μm and a porosity of 25.3% (see Table 1 below). In addition, the XRC·FWHM of the outermost surface of the alumina sintered body was 2.2°, and the XRC·FWHM of the surface (inside) after grinding to 100 μm was also 2.2° (see Table 1 below). Thus, the obtained alumina sintered body is an oriented alumina sintered body, and the crystal orientation of the surface of the alumina sintered body is the same as the crystal orientation of the interior.

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Abstract

The method for producing an oriented ceramic sintered body of the present invention includes the steps of: (a) producing a ceramic molded body before firing into an oriented ceramic sintered body; and (b) sandwiching the ceramic molded body with a pair of release sheets and placing the ceramic molded body in a hot press In the firing furnace, hot-press firing was performed while pressing the ceramic molded body with a pair of punches through a pair of release sheets, thereby obtaining an oriented ceramic sintered body. The release sheet was sandwiched by a PET film having a thickness of 75 μm and a surface arithmetic mean roughness Ra of 0.03 μm, and then placed on a stainless steel plate having a thickness of 10 mm and a surface arithmetic mean roughness Ra of 0.29 μm and performed Vacuum packing, at 200kg / cm 2 After isostatic pressing, the maximum cross-sectional height Pt of the cross-sectional curve of the surface of the release sheet opposite to the stainless steel plate side is 0.8 μm or less.

Description

technical field [0001] The present invention relates to a method for producing an oriented ceramic sintered body and a flat sheet. Background technique [0002] As a firing method of ceramics, a hot pressing method is known in which firing is performed while pressurizing a ceramic powder or a ceramic molded body at a high temperature. When a ceramic is produced by a hot pressing method, a spacer is usually arranged between the samples in order to protect the samples and the pressed parts. In order to avoid stress concentration due to the difference in thermal expansion rate with other components, the spacer is mostly made of the same material as other components. For example, in general, all parts are made of graphite in an inert atmosphere, and all parts are made of alumina or silicon carbide in an oxidizing atmosphere. However, in this method, since the sample and the spacer are in direct contact, there is a problem that the sample and the spacer react, stick, or the spa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/645C04B35/111
CPCC04B35/111C04B2235/787C04B2235/5445C04B2235/5436C04B2235/5292C04B2235/5296C04B2235/3206C04B2235/6025C04B35/638C04B35/645C04B2235/6586C04B2235/6028C04B2235/3217
Inventor 渡边守道佐藤圭松岛洁前田高宏吉川润七泷努
Owner NGK INSULATORS LTD
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