煤熔渣对SiC-CA6复合材料的侵蚀机制分析  

Corrosion mechanism analysis of coal slag on SiC-CA6 composites

作　　者：司瑶晨 夏淼 孙红刚[1] 李红霞[1] 杜一昊 赵世贤[1] 尚心莲 Si Yaochen;Xia Miao;Sun Honggang;Li Hongxia;Du Yihao;Zhao Shixian;Shang Xinlian(State Key Laboratory of Advanced Refractories,Sinosteel Luoyang Institute of Refractories Research Co.,Ltd.,Luoyang 471039,Henan,China)

机构地区：[1]中钢集团洛阳耐火材料研究院有限公司先进耐火材料国家重点试验室,河南洛阳471039

出　　处：《耐火材料》2021年第1期40-43,共4页Refractories

基　　金：NSFC-河南联合基金重点支持项目(U1604252)。

摘　　要：采用静态坩埚法,在埋碳气氛中对SiC-CA6复合材料进行了1 500℃保温3 h的抗煤熔渣侵蚀试验,通过XRD、SEM、EDS等分析了煤熔渣对SiC-CA6复合材料的侵蚀机制。结果表明:1)在还原气氛下,SiC-CA6复合材料中未发现明显的侵蚀层,形成的渗透层较薄且比较致密,表明Si C-CA6复合材料具有较好的抗煤熔渣性能。2)煤熔渣对Si C-CA6复合材料的侵蚀主要包括渣层界面处的Si C颗粒被渣中的铁氧化物氧化,以及基质中的CA6与渣中的SiO2、Al2O3、CaO反应生成CAS2。CAS2溶入渣中使得界面处局部区域内的熔煤渣黏度增大,抑制了熔渣向材料内部的进一步渗透。The coal slag corrosion resistance of SiC-CA 6 composites was tested using the static crucible method under carbon embedded atmosphere at 1500℃for 3 h.The corrosion mechanism of coal slag on SiC-CA 6 composites was studied by means of XRD,SEM and EDS.The results show that:(1)in the reducing atmosphere,no obvious corrosion layer is found in the SiC-CA 6 composites;the formed permeation layer is relatively thin and dense,indicating that SiC-CA 6 composites have good slag corrosion resistance;(2)the corrosion mechanism of coal slag on SiC-CA 6 composites mainly includes two aspects:the oxidation of SiC particles at the slag/sample interface by iron oxide in the slag and the reaction of CA 6 in sample matrix with the SiO 2,Al 2O 3 and CaO in the slag to form CAS 2;the formed CAS 2 can dissolve into the slag and increase the viscosity of the local slag at the slag/sample interface,therefore suppressing the further penetration of the slag into the material.

关 键 词：SiC-CA6复合材料 煤熔渣 静态坩埚法 侵蚀机制 煤气化 

分 类 号：TQ175[化学工程—硅酸盐工业]