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Method for preparing silicon carbide-aluminum nitride (SiC-AlN) solid solution ceramic powder

A ceramic powder and solid solution technology, which is applied in the field of non-oxide ceramic powder preparation, can solve the problems of uneven composition of precursors, high sintering temperature, and long reaction time, and achieve the effects of fine particle size, lower reaction temperature, and low production cost

Active Publication Date: 2012-06-27
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a new method for preparing SiC-AlN solid solution ceramic powder, which solves the problems of uneven precursor composition, high sintering temperature, long reaction time and high preparation cost caused by the traditional mixing method of mechanical blending and drying and crushing.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0014] Weigh 0.2 mol of glucose, 0.1 mol of aluminum nitrate, 0.1 mol of silica sol, 0.2 mol of urea, and 8 g of polyacrylamide. The various water-soluble raw materials mentioned above are dissolved in the aqueous solution to obtain a mixed solution. The mixed solution is heated on a temperature-controllable electric furnace at 300°C, and the solution undergoes a series of processes such as volatilization, concentration, and bubbling to obtain precursors. After the precursor was pulverized, it was reacted for 5 hours at 1400° C. with an argon flow rate of 1 l / min to obtain an argon-passed calcined product. The argon-passed calcined product was reacted for 10 h under the conditions of 1800° C. and a nitrogen gas flow rate of 5 l / min to obtain a nitrogen-passed calcined product. The nitrogen-passed calcined product was decarbonized in air at 650° C. for 2 hours to obtain a SiC-AlN solid solution ceramic submicron powder.

Embodiment 2

[0016] Weigh 0.2 mol of glucose, 0.05 mol of aluminum nitrate, 0.1 mol of silica sol, 0.2 mol of urea, and 10 g of polyacrylamide. The various water-soluble raw materials mentioned above are dissolved in the aqueous solution to obtain a mixed solution. The mixed solution is heated on a temperature-controllable electric furnace at 400°C, and the solution undergoes a series of processes such as volatilization, concentration, and bubbling to obtain precursors. After the precursor was pulverized, it was reacted for 4 hours at 1500° C. with an argon flow rate of 2 l / min to obtain an argon-passed calcined product. The argon-passed calcined product was reacted for 5 hours under the conditions of 1400° C. and a nitrogen flow rate of 5 l / min to obtain a nitrogen-passed calcined product. The nitrogen-passed calcined product was decarbonized in air at 650° C. for 2 hours to obtain a SiC-AlN solid solution ceramic submicron powder.

Embodiment 3

[0018] Weigh 0.2 mol of glucose, 0.1 mol of aluminum nitrate, 0.05 mol of silica sol, 0.1 mol of urea, and 5 g of polyacrylamide. The various water-soluble raw materials mentioned above are dissolved in the aqueous solution to obtain a mixed solution. The mixed solution is heated on a temperature-controllable electric furnace at 300°C, and the solution undergoes a series of processes such as volatilization, concentration, and bubbling to obtain precursors. After the precursor was pulverized, it was reacted for 8 hours at 1400° C. with an argon flow rate of 0.5 l / min to obtain an argon-passed calcined product. The argon-passed calcined product was reacted for 4 hours at 1800° C. and a nitrogen flow rate of 4 l / min to obtain a nitrogen-passed calcined product. The nitrogen-passed calcined product was decarbonized in air at 650° C. for 2 hours to obtain a SiC-AlN solid solution ceramic submicron powder.

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Abstract

A method for preparing silicon carbide-aluminum nitride (SiC-AlN) solid solution ceramic powder belongs to the field of ceramic powder preparation, which enables submicron with small particle size to be directly contacted reacted through improvement of a raw material mixing method to improve reactivity of a precursor, and is favorable to preparation of the SiC-AlN solid solution ceramic submicron powder which is high in purity, fine in particle size, and good in uniformity and the reactivity under the condition of low temperature. An aluminum source is aluminum nitrate, a silicon source is silica solution, a carbon source is dextrose, and an annexing agent is urea, polyacrylamide and nitric acid. Molar ratio between the aluminum source and the silicon source is Si:Al=1: (0.2-5), molar ratio between the aluminum source and the silicon source and the carbon source is (Si+Al): C=1: (5-16), molar ratio between +5 valent nitrogen and -3 valent nitrogen is N+5:N-3=1: (0.1-10), and mass ratio between the polyacrylamide and the silica solution is (0.5-2):1. The method for preparing the SiC-AlN solid solution ceramic powder is wide in raw material source and low in prize and production cost, and prepared SiC-AlN solid solution ceramic submicron powder is stable in performance, simple in production process and capable of achieving mass production.

Description

technical field [0001] The invention belongs to the technical field of preparation of non-oxide ceramic powder, and in particular provides a method for preparing SiC-AlN solid solution ceramic submicron powder. Background technique [0002] SiC-AlN solid solution ceramic material is a new type of composite ceramic. Because of its good mechanical properties, oxidation resistance, high temperature strength, etc., it has attracted widespread attention. [0003] Since the 1990s, the research on SiC-AlN composite ceramics has focused on the ceramic sintering process and ceramic oxidation resistance. Because hot pressing or hot isostatic pressing equipment is expensive, the process is complicated, and the cost is high, in recent years, people's research on this composite ceramic has gradually turned to atmospheric pressure (no pressure) sintering. At present, the research of pressureless sintered SiC-AlN composite ceramics is mainly to investigate the type and content of sinte...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/582C04B35/626
Inventor 曲选辉秦明礼储爱民鲁慧峰贾宝瑞
Owner UNIV OF SCI & TECH BEIJING
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