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BULLETIN OF THE CHINESE CERAMIC SOCIETY ›› 2024, Vol. 43 ›› Issue (7): 2680-2684.

Special Issue: 耐火材料

• Refractory Materials • Previous Articles     Next Articles

Preparation of Si2N2O/SiC Composite Powders Using Carbothermal Reduction Nitridation Method for Diatomite

WAN Gan1, KUANG Meng2,3, HUANG Siyuan4, ZHANG Jinjun3, WANG Ping4, ZHANG Shengzhou1   

  1. 1. College of Materials Engineering, Ganzhou Polytechnic, Ganzhou 341000, China;
    2. Shenzhen Institute of Standards and Technology, Shenzhen 518033, China;
    3. China Building Materials Academy Co., Ltd., Beijing 100024, China;
    4. School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
  • Received:2023-12-07 Revised:2024-01-30 Online:2024-07-15 Published:2024-07-24

Abstract: Silicon oxynitride (Si2N2O) is a high-performance refractory and high-temperature structural material, which has advantages such as excellent creep resistance, corrosion resistance, and oxidation resistance. In this work, diatomite was used as silicon source, acetylene carbon black was used as reducing agent, and the Si2N2O/SiC composite powders were synthesized in situ on the surface of diatomite through carbothermal reduction nitridation method. The samples were characterized by X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), and N2 adsorption/desorption isotherms. The results indicate that under the condition of raw materials ratio m(diatomite)∶m(acetylene carbon black)=1∶1, the SiO2 completely transforms into Si2N2O and β-SiC after calcination at 1 450 ℃ for 4 h, and the sample shows a spherical morphology with mesoporous structure, while a large number of layered small particles distribute around the large particles. As a high-performance high-temperature structural material, Si2N2O/SiC composite powders could be a promising candidate for application in the field of structural composite materials.

Key words: Si2N2O/SiC, diatomite, carbothermal reduction nitridation method, porous structure, high-temperature structural material, composite powder

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