Composite ceramic and method for producing same

A composite ceramic and a manufacturing method technology, applied in the field of composite ceramics and its manufacturing method, can solve the problems of reduced flexural strength, low mechanical strength, low hot water resistance, etc., and achieve the suppression of flexural strength reduction and wear resistance Excellent, high hot water resistance effect

Active Publication Date: 2008-01-16
KYOCERA CORP
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Problems solved by technology

[0006] The zirconia-based composite ceramics described in Patent Document 1 is a zirconia-rich sintered body containing 3 to 60% by weight of alumina per stabilized zirconia, and has an average crystal grain size of 3 μm or less. and high resistance to hot water deterioration, but low hardness, which is not conducive to wear-resistant materials
[0007] On the other hand, although the alumina-zirconia composite ceramics disclosed in Patent Document 2 has high toughness, due to the abnormal grain growth of the alumina crystal phase, the mechanical strength is low, especially the hot water resistance is low, and there are defects after the hot water deterioration test. The flexural strength is greatly reduced such disadvantages

Method used

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  • Composite ceramic and method for producing same

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Effect test

experiment example 1

[0087] First, alumina powder with an average crystal grain size of 0.3 μm and a purity of 99.9% by mass and various additives shown in Table 1 were mixed, and calcined at 800° C. for 1 hour. Next, zirconia powder having an average crystal grain size of 0.3 μm and a purity of 99.9% by mass was mixed with the calcined powder in the ratio shown in Table 1 to prepare a molding powder.

[0088] In addition, the mixing of alumina powder and various additives, as well as the mixing of zirconia powder and calcined powder, all use high-purity wear-resistant alumina balls and polyethylene containers, using isopropyl alcohol (IPA) as a solvent Wet ball mill mixing (mixing time 100 hours) was performed.

[0089] The powder for molding obtained above was dried, followed by extrusion molding, and calcined at 1400 to 1550° C. for 2 hours in the air to prepare a rod-shaped sintered body sample.

[0090] Next, under the conditions (atmosphere and temperature) shown in Table 1, hot hydrostatic...

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Abstract

Disclosed is a composite ceramic which is composed of a bulk alumina crystal phase (A) having an aspect ratio of not more than 3, a bulk zirconia crystal phase (B) having an aspect ratio of not more than 3 and a columnar crystal (C) of a complex oxide containing an alkaline earth metal and aluminum element which has an aspect ratio of more than 3. This composite ceramic has excellent flexural strength, excellent toughness, high hardness, excellent hot water resistance, and high transverse strength after thermal degradation resistance test.

Description

technical field [0001] The present invention relates to a high-strength, high-toughness, high-wear-resistant composite ceramic and a method for producing the same, and particularly to a composite ceramic suitable for use as various structures or parts thereof and a method for producing the same. Background technique [0002] In recent years, ceramics have been applied to various structures and components thereof for reasons such as excellent mechanical properties and corrosion resistance. For example, there are various knives and tools, mechanical parts such as bearings, and living body members such as human joints. As a ceramic suitable for the above application, Patent Document 1 discloses a zirconia-based composite ceramic containing CeO 2 and Y 2 o 3 Stabilized zirconia crystalline phase and alumina crystalline phase. This composite ceramic is mainly composed of a zirconia crystal phase and is composed of tetragonal crystals, and is excellent in mechanical properties...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/119
Inventor 四方邦英王雨丛濑野裕明鬼塚修吾
Owner KYOCERA CORP
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