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Alpha-sialon composite ceramic material and preparation method thereof

A technology of composite ceramics and ceramic materials, which is applied in the field of ceramic materials and their preparation processes, can solve problems such as high-temperature performance degradation, and achieve the effect of simple preparation processes

Inactive Publication Date: 2007-03-14
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the residual glass phase in α-sialon ceramics leads to a significant decline in its high-temperature performance, the present invention provides an α-sialon composite ceramic material and its preparation method

Method used

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  • Alpha-sialon composite ceramic material and preparation method thereof
  • Alpha-sialon composite ceramic material and preparation method thereof
  • Alpha-sialon composite ceramic material and preparation method thereof

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specific Embodiment approach

[0016] Specific embodiments: the α-sialon composite ceramic material of this embodiment adopts BAS as an additive to generate a self-toughening α-sialon material, and the weight percentage of BAS is 0.1% to 30%, and the optimum value is 5% to 10%.

[0017] Barium feldspar can be used as an additive, BAS amorphous powder synthesized by solution chemical method [Ye Feng Northwestern Polytechnical University Postdoctoral Research Work Report, May 1997], its particle size is about 0.1 μm ~ 50 μm, preferably less than 5 μm; with BaCO 3 (or BaSO 4 ), Al2O 3 , SiO 2 The powders react in situ during the sintering process to generate BAS, and the purity of each powder is preferably greater than 99.5%, and the particle size is less than 5 μm. A small amount of Al can also be added to the BAS additive 2 o 3 , and the excess SiO in the system 2 The reaction produces mullite, which can improve the high temperature strength of the material. These Al 2 o 3 The mole percentage of BAS ...

specific Embodiment approach 2

[0020] Embodiment 2: In this embodiment, the α-sialon composite ceramic material described in Embodiment 1 is prepared according to the following steps: a. Mix the raw material powders uniformly according to the above ratio, and the mixing time is 2 to 36 hours; b. The uniform powder is cold-pressed at room temperature first, and then hot-pressed and sintered, or directly hot-pressed and sintered without cold-pressing. The sintering temperature is 1600°C-2000°C, the pressurization method is one-way or two-way pressurization, the applied pressure is 10-45MPa, and the sintering holding time is 0.5-2 hours. The sintering atmosphere is nitrogen or vacuum.

[0021] This embodiment can adopt following several mixing processes:

[0022] (1) Mix the powders evenly, the mixing method is wet mixing, and the mixing medium can be ethanol, isopropanol, etc. Ceramic balls (alumina balls or silicon nitride balls, etc.) can be added to improve mixing efficiency. The mixed powder and the mi...

specific Embodiment approach 3

[0024] Embodiment 3: This embodiment is different from Embodiment 2 in that the homogeneously mixed powder is sequentially subjected to cold pressing and pressureless sintering. The sintering temperature is 1600°C-2000°C, and the sintering holding time is 0.5-2 hours. The sintering atmosphere is nitrogen or vacuum.

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Abstract

The present invention relates to ceramic material, is alpha-Sialon composite ceramic material and its preparation process, and aims at solving the problem that residual glass phase in alpha-Sialon ceramic degrades the high temperature performance obviously. The alpha-Sialon composite ceramic material of the present invention has BAS in 0.1-30 wt% as additive to create self-toughened alpha-Sialon material, and is prepared through a powder metallurgy process. The present invention adds barium feldspar glass ceramic to Sialon ceramic to realize the in-situ growth of rod-shaped alpha-Sialon crystal grain and the complete crystallization of barium feldspar and to synthesize alpha-Sialon material with excellent performance, especially bending strength not degrading up to 1500 deg.c.

Description

technical field [0001] The invention relates to a ceramic material and a preparation process thereof. Background technique [0002] The European Eureka Advanced Automotive Gas Turbine Project [Journal of the European Ceramic Society19 1999 2367-2373] and the Japanese 100kW Automotive Ceramic Gas Turbine Project [Composites Science and Technology 59 1999 861-872] respectively selected hot isostatic pressing sintered crystal whisker to enhance sialon Ceramic matrix composites have made important achievements in making engine hot-end parts. [0003] α-sialon (Sialon) has high hardness (H vl0 , 19-22GPa), good thermal and chemical stability and other unique properties, it is the most potential high-temperature structural ceramic material. [0004] In order to overcome the problems of low strength and high brittleness of α-sialon materials, a lot of research work has been done at home and abroad. By adding high melting point substances to reinforce and toughen α-sialon, althou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/599C04B35/622
Inventor 叶枫周玉刘利盟
Owner HARBIN INST OF TECH
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