干熄炉用碳化硅耐火材料抗CO侵蚀性研究  

CO resistance of SiC refractories for CDQ furnace

作　　者：李杰[1] 曹会彦[1] 黄志刚[1] Li Jie;Cao Huiyan;Huang Zhigang

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实验室

出　　处：《耐火材料》2019年第6期464-467,共4页Refractories

摘　　要：研究了SiAlON(主要为Si 4Al 2O2N 6)结合SiC、复相氮化物(Si 2N 2O/Si 3N 4)结合SiC和β-SiC结合SiC材料在1000℃、CO气氛(C+CO22CO)中分别侵蚀100、200、300和400 h后其质量、显气孔率、常温耐压强度以及物相组成和显微结构的变化。结果表明:1、复相氮化物结合SiC材料抗CO侵蚀性最好,CO侵蚀后其常温耐压强度大幅度增大,达到363 MPa;SiAlON结合SiC的次之,为200 MPa;β-SiC结合SiC的最差,为136 MPa。2、复相氮化物结合SiC材料被CO侵蚀后,其致密度增大较多;SiAlON结合SiC材料被CO侵蚀后,SiAlON发生Al 2O3脱溶,有新生针状产物;β-SiC结合SiC材料被CO侵蚀后,生成了少量方石英或石英。SiAlON(mainly Si 4Al 2O2N 6)bonded SiC,multi-nitride(Si 2N 2O/Si 3N 4)bonded SiC andβ-SiC bonded SiC after 100 h,200 h,300 h or 400 h corrosion in CO atmosphere(C+CO22CO)at 1000℃were investigated in terms of the mass change,the apparent porosity,the cold crushing strength as well as the phase composition and the microstructure.The result shows that:(1)multi-nitride bonded SiC presents the best CO resistance with 363 MPa of cold crushing strength after CO corrosion,followed by SiAlON bonded SiC(200 MPa),andβ-SiC bonded SiC(136 MPa);(2)the bulk density of multi-nitride bonded SiC increases the most after CO corrosion;Al 2O3 exsolves out of SiAlON bonded SiC after CO corrosion and forms needle-like products;a small quantity of cristobalite or quartz forms inβ-SiC bonded SiC after CO corrosion.

关 键 词：干熄炉 SIC材料 CO侵蚀 

分 类 号：TQ175[化学工程—硅酸盐工业]