碳热还原氮化硅藻土制备Si_(2)N_(2)O/SiC复合粉体  

Preparation of Si_(2)N_(2)O/SiC Composite Powders Using Carbothermal Reduction Nitridation Method for Diatomite

作　　者：万赣 匡猛 黄思源 张琎珺 王平 张声洲 WAN Gan;KUANG Meng;HUANG Siyuan;ZHANG Jinjun;WANG Ping;ZHANG Shengzhou(College of Materials Engineering,Ganzhou Polytechnic,Ganzhou 341000,China;Shenzhen Institute of Standards and Technology,Shenzhen 518033,China;China Building Materials Academy Co.,Ltd.,Beijing 100024,China;School of Materials Science and Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]赣州职业技术学院材料工程学院,赣州341000 [2]深圳市标准技术研究院,深圳518033 [3]中国建筑材料科学研究总院有限公司,北京100024 [4]江西理工大学材料科学与工程学院,赣州341000

出　　处：《硅酸盐通报》2024年第7期2680-2684,共5页Bulletin of the Chinese Ceramic Society

基　　金：江西省教育科学“十四五”规划2023年度课题(23GZYB097)。

摘　　要：氧氮化硅(Si_(2)N_(2)O)是性能优良的耐火材料和高温结构材料,具有优异的抗蠕变性、耐腐蚀性和抗氧化性等优点。本工作利用硅藻土作为硅源,乙炔炭黑作为还原剂,通过碳热还原氮化法在硅藻土表面原位合成Si_(2)N_(2)O/SiC复合粉体。采用X射线衍射(XRD)分析、扫描电子显微镜(SEM)和N_(2)吸附/脱附等温线对样品进行表征。结果表明,在原料配比m(硅藻土)∶m(乙炔炭黑)=1∶1条件下,1 450℃煅烧4 h后,SiO_(2)完全转变成Si_(2)N_(2)O和β-SiC物相,样品整体呈球状形貌,大颗粒周围分布大量片层状小颗粒,并存在介孔结构。Si_(2)N_(2)O/SiC复合粉体作为性能优良的高温结构材料,有望在结构复合材料中得到广泛的应用。Silicon oxynitride(Si_(2)N_(2)O)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 Si_(2)N_(2)O/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 N_(2) adsorption/desorption isotherms.The results indicate that under the condition of raw materials ratio m(diatomite)∶m(acetylene carbon black)=1∶1,the SiO 2 completely transforms into Si_(2)N_(2)O andβ-SiC after calcination at 1450℃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,Si_(2)N_(2)O/SiC composite powders could be a promising candidate for application in the field of structural composite materials.

关 键 词：Si_(2)N_(2)O/SiC 硅藻土 碳热还原氮化法 多孔结构 高温结构材料 复合粉体 

分 类 号：TQ424.22[化学工程]