碳热还原氮化硅藻土制备Si2N2O/SiC复合粉体
Preparation of Si2N2O/SiC Composite Powders Using Carbothermal Reduction Nitridation Method for Diatomite
万赣 1匡猛 2黄思源 3张琎珺 4王平 3张声洲1
作者信息
- 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;中国建筑材料科学研究总院有限公司,北京 100024
- 3. 江西理工大学材料科学与工程学院,赣州 341000
- 4. 中国建筑材料科学研究总院有限公司,北京 100024
- 折叠
摘要
氧氮化硅(Si2N2O)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Si2N2O/SiC复合粉体.采用X射线衍射(XRD)分析、扫描电子显微镜(SEM)和N2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,SiO2完全转变成Si2N2O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.Si2N2O/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.
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 Si2 N2O 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.
关键词
Si2N2O/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Key words
Si2N2O/SiC/diatomite/carbothermal reduction nitridation method/porous structure/high-temperature structural material/composite powder引用本文复制引用
基金项目
江西省教育科学"十四五"规划2023年度课题(23GZYB097)
出版年
2024
国家科技期刊平台
NSTL
万方数据