Method for producing oriented sintered body

Patent metadata

Field	Value
Publication number	US-10774002-B2
Application number	US-201815956898-A
Country	US
Kind code	B2
Filing date	Apr 19, 2018
Priority date	Nov 16, 2015
Publication date	Sep 15, 2020
Grant date	Sep 15, 2020

Abstract

A method for producing an oriented sintered body according to the present invention includes the steps of: (a) preparing a multilayer body, the multilayer body including a layer including a fine raw-material powder and a layer including a plate-like raw-material powder which are alternately stacked each other, particles of the plate-like raw-material powder being arranged such that surfaces of the particles of the plate-like raw-material powder extend along a surface of the layer including a fine raw-material powder; and (b) sintering the multilayer body.

First claim

What is claimed is:

1. A method for producing an oriented sintered body comprising the steps of:
(a) preparing a multilayer body, the multilayer body including a layer including a fine raw-material powder and a layer including a plate-like raw-material powder which are alternately stacked on each other, particles of the plate-like raw-material powder being arranged such that surfaces of the particles of the plate-like raw-material powder extend along a surface of the layer including the fine raw-material powder; and
(b) sintering the multilayer body,
wherein the particles of the fine raw-material powder have a smaller average diameter than the particles of the plate-like raw-material powder, and
wherein a coverage at which the surface of the layer including the fine raw-material powder is covered with the plate-like raw-material powder is 1% to 60%.

2. The method for producing an oriented sintered body according to claim 1 , wherein the layer including the fine raw-material powder has a thickness of 5 to 100 μm.

3. The method for producing an oriented sintered body according to claim 1 , wherein, in the step (a), a single-side processed body including a compact of the fine raw-material powder having two opposed major surfaces and the layer including the plate-like raw-material powder, the layer covering one major surface of the compact, is prepared, and the multilayer body is prepared using the single-side processed body.

4. The method for producing an oriented sintered body according to claim 3 , wherein the single-side processed body is prepared by stacking a compact of the plate-like raw-material powder on one of the major surfaces of the compact of the fine raw-material powder, the compact of the plate-like raw-material powder having a smaller thickness than the compact of the fine raw-material powder, or by applying a dispersion liquid containing the plate-like raw-material powder on one of the major surfaces of the compact of the fine raw-material powder by printing method, spray coating method, spin coating method, or dip coating method.

5. The method for producing an oriented sintered body according to claim 1 , wherein, in the step (a), a double-side processed body including a compact of the fine raw-material powder and the particles of the plate-like raw-material powder having two opposed major surfaces, the particles being arranged on both of the major surfaces of the compact such that the surfaces of the particles extend along a corresponding major surface of the compact, is prepared, and the multilayer body is prepared using the double-side processed body and a compact that has not been processed.

6. The method for producing an oriented sintered body according to claim 5 , wherein the double-side processed body is prepared by stacking a compact of the plate-like raw-material powder on both of the major surfaces of the compact of the fine raw-material powder, the compact of the plate-like raw-material powder having a smaller thickness than the compact of the fine raw-material powder, or by applying a dispersion liquid containing the plate-like raw-material powder on both of the major surfaces of the compact of the fine raw-material powder by printing method, spray coating method, spin coating method, or dip coating method.

7. The method for producing an oriented sintered body according to claim 1 , wherein, in the step (b), the multilayer body is sintered under pressure.

8. The method for producing an oriented sintered body according to claim 1 , wherein a principal component of the fine raw-material powder and a principal component of the plate-like raw-material powder are both alumina.

Assignees

• Ngk Insulators Ltd

Inventors

• Sato Kei
• Maeda Takahiro
• Watanabe Morimichi
• Nanataki Tsutomu

Classifications

• C30B1/12 Primary

  by pressure treatment during the growth · CPC title

• C30B1/04

  Isothermal recrystallisation · CPC title

• C30B28/02

  directly from the solid state · CPC title

• C30B29/20

  Aluminium oxides · CPC title

• C04B35/6342

  Polyvinylacetals, e.g. polyvinylbutyral [PVB] · CPC title