二氧化硅微粉对炭素捣打料显微结构及性能的影响  

Effects of microsilica addition on the microstructure and properties of carbon material

作　　者：辛占武[1,2] 顾华志[1] 朱晶晶[1] 杨林 王小军 

机构地区：[1]武汉科技大学耐火材料与高温陶瓷国家重点实验室培育基地,湖北武汉430081 [2]太钢不锈钢股份有限公司,山西太原030003 [3]北京瑞普同创科技发展有限公司,北京102400

出　　处：《武汉科技大学学报》2011年第4期270-273,共4页Journal of Wuhan University of Science and Technology

基　　金：湖北省自然科学基金重点项目(2009CDA050)

摘　　要：以冶金焦粉为主要原料,改性中温沥青粉为结合剂,添加二氧化硅微粉混合成型,于220℃下干燥、1 550℃下埋炭烧成炭素捣打料。测定烧成样的耐压强度、体积密度和导热系数,采用XRD和SEM分析试样物相及显微结构。结果表明,添加了二氧化硅微粉的试样经1 550℃热处理,可原位反应生成碳化硅晶须,二氧化硅微粉初期添加量越大,所生成的碳化硅晶须越多,试样的体积密度、耐压强度和导热系数越高;当二氧化硅微粉添加量为8.5%时,试样的碳化硅晶须生成量减少,导热系数降低。Carbon material was prepared by using waste coke powder as main raw material,modified middle temperature asphalt powder as binder,and microsilica as additive,which were mixed,molded,dried at 220 ℃,embedded in carbon and then fired at 1 550 ℃ for 3 h.The main physical properties of the specimens after firing were investigated,and the phase composition and microstructure of the specimens were characterized by XRD and SEM.The results show that,in-situ synthesized SiC whisker can be generated in the specimens sintered at 1 550 ℃,and with the microsilica addition increasing,the SiC whisker increases.Consequently,the bulk density and compressive strength of the specimensincrease,andthethermalconductivityimproves,butwhentheadditionofmicrosilicais8.5%,the SiC whisker decreases and the thermal conductivity of the specimens decreases.

关 键 词：二氧化硅微粉 炭素材料 原位反应 碳化硅晶须 

分 类 号：TB383[一般工业技术—材料科学与工程]