Method for extruding frozen camphene/silicon nitride body to prepare oriented porous silicon nitride ceramic
A technology for preparing silicon nitride ceramics and green bodies, which is applied in ceramic products, applications, household appliances, etc., can solve the problems of preparing highly oriented porous silicon nitride ceramics that have not yet been disclosed, and achieve easy control of pore structure and ceramic quality. The effect of high porosity and uniform distribution of pore structure
Active Publication Date: 2015-11-25
西安晶科立芯半导体设备有限公司
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The prior art has not disclosed the preparation of highly oriented porous silicon nit
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[0038] The morphology of the directional porous silicon nitride ceramic prepared in Example 4 is as figure 2 As shown, it can be seen that the microstructure is mainly rod-shaped β-Si3N4 grains with high aspect ratio, which is beneficial to the improvement of mechanical properties.
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The invention discloses a method for extruding a frozen camphene/silicon nitride body to prepare oriented porous silicon nitride ceramic. The preparation method comprises the steps that firstly, solid powder obtained by mixing a sintering additive and silicon nitride powder and a certain amount of molten camphene dissolved with an organic addition agent are mixed to obtain uniform systematic slurry; secondly, the uniform systematic slurry is subjected to oriented freezing to obtain the frozen body, the obtained frozen body is subjected to heat treatment and then is extruded at certain rate, and then vacuum drying is performed to obtain a green body of the highly-oriented porous silicon nitride ceramic; sintering is performed in the nitrogen protection atmosphere to obtain the oriented porous silicon nitride ceramic after heating and glue discharging. The preparation method has the advantages that a preparation process is simple, the orientation degree of a prepared sample is high, porosity is high and the quality of the ceramic is easy to control.
Description
technical field [0001] The invention relates to the field of porous silicon nitride ceramics, in particular to a method for preparing oriented porous silicon nitride ceramics by extruding a camphene / silicon nitride frozen body. Background technique [0002] Oriented porous materials have attracted attention from various fields in recent years because of their functionality that traditional materials do not have. Among them, freezing the liquid ceramic slurry to grow "ice crystals" along the freezing direction, and then removing the "ice crystals" is currently the most effective method for preparing oriented porous materials. At present, it has been reported that oriented porous alumina and silicon carbide materials have been successfully prepared by freeze-drying with water, camphene, tert-butanol, etc. Different from the traditional freeze-drying technology, the plasticity and rheological properties of the camphene-based frozen body can further improve the orientation of t...
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Login to view more IPC IPC(8): C04B38/06C04B35/584C04B35/632
Inventor 于方丽白宇倪澍李杨吴兴萍徐海
Owner 西安晶科立芯半导体设备有限公司
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