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Production method for aligned ceramic sintered body, and flat sheet

A technology of 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 adhesion spacer cracking

Active Publication Date: 2020-06-12
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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  • Production method for aligned ceramic sintered body, and flat sheet
  • Production method for aligned ceramic sintered body, and flat sheet
  • Production method for aligned 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] Mix 0.5 parts by mass of commercially available tabular alumina powder (YFA10030, manufactured by KinseiMatec, average particle diameter 10 μm, average thickness 0.35 μm, aspect ratio 29) and fine alumina powder (TM-DAR, average particle diameter 0.1 μm , Daming Chemical) 99.5 parts by mass to make mixed alumina powder. When the mass ratio of the platy alumina powder to the fine alumina powder is represented by T: (100-T), T=0.5. To 100 parts by mass of the mixed alumina powder, 0.0125 parts by mass (125 ppm by mass) of magnesium oxide (500A, manufactured by Ube Materials) and polyvinyl butyral (product number BM-2, Sekisui Chemical Co., Ltd.) as a binder were added. Industrial production) 7.8 parts by mass, bis(2-ethylhexyl) phthalate (manufactured by Kurokin Kasei) 3.9 parts by mass as a plasticizer, sorbitan trioleate (Rheodol SP -O30, manufactured by Kao) 2 parts by mas...

experiment example 2

[0061] In Experimental Example 2, commercially available plate-shaped graphite powder (SGP-3, SEC carbon, average particle diameter 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 porosity 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) ground 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 of 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) ground 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 production method for an aligned ceramic sintered body according to the present invention comprises: (a) a step for producing a ceramic molded article before firing the ceramic molded article intothe aligned ceramic sintered body; and (b) a step for sandwiching the ceramic molded article between a pair of release sheets, placing the sandwiched ceramic molded article in a hot-press firing furnace, and hot-press firing the ceramic molded article while applying pressure on the ceramic molded article through the pair of release sheets by using a pair of punches, to obtain the aligned ceramicsintered body. When each of the release sheets is sandwiched by PET films having a thickness of 75 [mu]m and an arithmetic mean surface roughness Ra of 0.03 [mu]m, is mounted on a stainless steel sheet having a thickness of 10 mm and an arithmetic mean surface roughness Ra of 0.29 [mu]m, is vacuum-packed, and is isostatically pressed at 200 kg / cm2, the surface of the release sheet on the oppositeside of the stainless steel sheet has a cross-sectional curve having a greatest cross-sectional height Pt of 0.8 [mu]m 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 method for firing ceramics, there is known a hot press method in which firing is performed while pressing a ceramic powder or a ceramic molded body at a high temperature. In the case of producing ceramics by hot pressing, spacers are usually placed between the samples to protect the samples and the pressed parts. In order to avoid stress concentration caused by a difference in thermal expansion rate with other components, the spacer is often made of the same material as the other components. For example, in general, all components are made of graphite in an inert atmosphere, and all of them 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 space...

Claims

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Application Information

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Patent Type & Authority Applications(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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