Method for preparing highly-pure beta-Sialon ceramic powders

A ceramic powder, high-purity technology, applied in the field of ceramic materials, can solve problems such as high content, high requirements, and inevitable impurities

A ceramic powder, high-purity technology, applied in the field of ceramic materials, can solve problems such as high content, high requirements, and inevitable impurities

CN101698610AInactive Publication Date: 2010-04-28SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Method for preparing highly-pure beta-Sialon ceramic powders
  • Method for preparing highly-pure beta-Sialon ceramic powders
  • Method for preparing highly-pure beta-Sialon ceramic powders

Examples

Experimental program
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Effect test

Embodiment 1

[0041]The molar ratio of silicon and aluminum in the initial proportion is 1:1, and the molar ratio of silicon and sucrose is 1:0.42. First dissolve 4.45g of anhydrous aluminum trichloride into 10g of deionized water, then add 3.0g of sucrose, stir for a while to completely dissolve the sucrose, then add 0.34g of sulfuric acid, then slowly add 2.0g of SBA-15 to the above solution, stir Evenly, the obtained product was dried at 80°C for 6 hours to allow the water to evaporate completely, and then the temperature was raised to 160°C for 6 hours of heat treatment for pre-carbonization. In the second step, continue to add a solution consisting of 1.8g of sucrose, 0.2g of sulfuric acid and 10g of deionized water to the above-mentioned pre-carbonized product, and repeat the drying at 80°C and heat treatment at 160°C. The third step is to calcine at 800°C for 6 hours under the protection of argon with an argon flow rate of 0.2 L / min to complete the entire carbonization process and ob...

Embodiment 2

[0043] The molar ratio of silicon and aluminum in the initial proportion is 1:1, and the molar ratio of silicon and sucrose is 1:0.5. First dissolve 4.45g of anhydrous aluminum trichloride into 10g of deionized water, then add 3.6g of sucrose, stir for a while to completely dissolve the sucrose, then add 0.4g of sulfuric acid, then slowly add 2.0g of SBA-15 to the above solution, stir Evenly, the obtained product was dried at 80°C for 6 hours to allow the water to evaporate completely, and then the temperature was raised to 160°C for 6 hours of heat treatment for pre-carbonization. In the second step, continue to add a solution consisting of 2.16g of sucrose, 0.24g of sulfuric acid and 10g of deionized water to the above-mentioned pre-carbonized product, and repeat the drying at 80°C and heat treatment at 160°C. The third step is to calcine at 800°C for 6 hours under the protection of argon with an argon flow rate of 0.2 L / min to complete the entire carbonization process and o...

Embodiment 3

[0045] The molar ratio of silicon and aluminum in the initial proportion is 1:1, and the molar ratio of silicon and sucrose is 1:0.58. First dissolve 4.45g of anhydrous aluminum trichloride into 10g of deionized water, then add 4.2g of sucrose, stir for a while to completely dissolve the sucrose, then add 0.48g of sulfuric acid, then slowly add 2.0g of SBA-15 to the above solution, stir Evenly, the obtained product was dried at 80°C for 6 hours to allow the water to evaporate completely, and then the temperature was raised to 160°C for 6 hours of heat treatment for pre-carbonization. In the second step, continue to add a solution consisting of 2.52g of sucrose, 0.3g of sulfuric acid and 10g of deionized water to the above-mentioned pre-carbonized product, and repeat the drying at 80°C and heat treatment at 160°C. The third step is to calcine at 800°C for 6 hours under the protection of argon with an argon flow rate of 0.2 L / min to complete the entire carbonization process and ...

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Abstract

The invention provides a method for preparing highly-pure beta-Sialon ceramic powders, which combines a carbothermal reduction nitridation process and nano-pouring technology and comprises the following specific steps: firstly, taking ordered mesoporous silicon dioxide as a main raw material, taking soluble inorganic aluminum salt as an aluminum oxide precursor, taking an organic small molecular compound as a carbon source, and preparing a compound of mesoporous carbon / silicon oxide / aluminum oxide through nanometer pouring; then performing carbothermal reduction nitridation on the compound of the mesoporous carbon / the silicon oxide / the aluminum oxide to prepare a sample; and finally, calcining the sample in air to remove residual carbon, and cooling the sample after residual carbon is removed to prepare a product. The method has the advantages that the synthesis temperature of the preparation method is relatively low, and is favorable for reducing the required energy consumption in production; and the purity of the prepared beta-Sialon ceramic powders is high, and the particle shapes are mainly in a long rod-like shape. The preparation method can be widely used in fields of space flight, metallurgy, chemical industry and the like.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a preparation method for synthesizing high-purity β-Sialon ceramic powder by using a carbothermal reduction nitriding process combined with a nano-casting technology and the β-Sialon ceramic powder prepared by the method. Background technique [0002] and high performance nitride material Si 3 N 4 The structure is similar to that of Sialon as Si 3 N 4 The solid solution can also be divided into two crystal forms, the low-temperature phase α-Sialon and the high-temperature phase β-Sialon. Wherein β-Sialon is β-Si 3 N 4 Z Si-N bonds in the structure are replaced by Z Al-O bonds, and its composition can be expressed as Si 6-z Al z o z N 8-z (where 0<Z≤4.2). Since β-Sialon is easy to grow into a columnar shape, it produces a whisker-like toughening effect, which makes β-Sialon have higher fracture strength and fracture toughness than α-Sialon. Due ...

Claims

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Application Information

Patent Timeline
28 Apr 2010
Publication
CN101698610A
IPC
C04B35/626; C04B35/599
Inventors
刘茜; 颜强