还原气氛下红柱石基材料的损毁机理研究  

Study on Marring Mechanism of Andalusite Based Material in Dense Reductive Atmosphere

作　　者：廖桂华[1] 李柳生[1] 蒋明学[2] LIAO Guihua;LI Liusheng;JIANG Mingxue(Henan Provincial Engineering Laboratory for Development and Utilization of Solid Waste Resource,Luoyang Institute of Science and Technology,Luoyang,Henan 471003,China;School of Materials Science and Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]洛阳理工学院固体废弃物开发利用河南省工程实验室,洛阳471023 [2]西安建筑科技大学材料科学与工程学院,西安710055

出　　处：《中国陶瓷》2020年第2期27-31,共5页China Ceramics

基　　金：国家自然科学基金资助项目(51672255);武汉科技大学耐火材料与冶金重点实验室开放基金(G201604)。

摘　　要：针对还原气氛条件下红柱石基材料的使用情况,实验研究了高纯度红柱石基材料试样在1300℃下经受强还原气氛热处理前后的气孔率、体积密度、耐压强度等物理性质变化,采用EDAX、XRD、SEM等手段分析了试样热处理前后的化学矿物组成和显微结构,从而探讨了强还原气氛下受热时红柱石基材料的损毁机理,并从热力学方面论证了其可能性。研究结果表明,在1300℃下的强还原气氛中保温处理时,CO对红柱石基材料发生的侵蚀反应主要是使其中的莫来石相和玻璃相中的SiO2被还原成SiO气相,从而造成红柱石基材料在化学矿物组成和显微结构方面逐渐产生变化,具体表现为化学组成上SiO2含量减少、Al2O3含量增多;矿物组成上莫来石和玻璃相含量减少、刚玉相含量增多;显微结构方面则由于SiO的挥发逸失,造成了结构空洞化现象。After being heated at 1300℃ for 216 hours in dense reductive atmosphere, the changes of bulk densi-ty, apparent porosity and cold crush strength of the high-purity andalusite based material samples were investigated. At the same time, the chemical composition, phase composition and microstructure of the samples before and after being heated in reductive atmosphere were also probed by EDAX, XRD and SEM. On the basis of these experime-ntal results, the marring mechanism of the andalusite based material that was being heated in dense reductive atmos-phere was analyzed and discussed, and the possibility of marring mechanism was demonstrated by thermodynamics. The research results show that, while the andalusite based material was being heated at 1300℃ in a dense reductive atmosphere, the marring reaction of CO on it would make SiO2 in mullite and glass phase inside the material reducedinto SiO gaseous phase, and thereby cause a gradual change in chemical composition, phase composition and micro-structure of the andalusite based material, as it stands, which could be described as the decrease of SiO2 content and increase of Al2O3 content, the reduction of mullite and glass phase content and increase of corundum phase, and occur-ring of a hollowing phenomenon in the material microstructure due to volatilization loss of SiO in the material.

关 键 词：红柱石基材料 还原气氛 热处理 损毁机理 

分 类 号：TQ174.75[化学工程—陶瓷工业]