纳米SiC陶瓷的氧化特性的研究  

Research on Oxidation Characteristics of SiC Nano Ceramics

作　　者：陈文怡[1] 

机构地区：[1]武汉理工大学材料研究与测试中心,武汉430070

出　　处：《中国陶瓷》2016年第5期20-23,共4页China Ceramics

基　　金：湖北省自然科学基金项目(2013CFB340)

摘　　要：采用差示扫描量热DSC研究了在不同的升温条件下的聚碳硅烷PCS热解产物纳米Si C粉末在空气环境中的氧化反应动力学,并结合X射线衍射和拉曼光谱技术探讨其氧化特性。结果表明:升温速度对PCS热解产物纳米Si C粉末的氧化过程有较大的影响,随着升温速度的增加,1100℃左右的放热氧化峰向高温方向偏移。动力学研究表明微米Si C氧化活化能为115.90 k J/mol,PCS热解产物纳米Si C粉末氧化活化能为485.73 k J/mol,表明PCS热解产物纳米Si C粉末具有较好的抗氧化性能。DSC thermal analysis technique combined with X-ray diffraction and Raman spectroscopy were used to study the oxidation characteristics and oxidation reaction kinetic of polycarbosilane（PCS）pyrolysis products（nano Si C powders）and commercial Si C powders in the air environment.The results showed that the heating rate of oxidation process had a greater impact on the oxidation reaction of Si C nano powders,with the increase of heating rate,exothermic oxidation peak around 1100 ℃ shifted to a higher temperature.Kinetic studies revealed that the oxidation reaction activation energy of commercial SiC powders was about 115.90 k J/mol and the oxidation reaction activation energy of PCS pyrolysis products is 485.73 k J/mol,which indicated PCS pyrolysis products had a good antioxidant property.

关 键 词：SIC 聚碳硅烷PCS 动力学 氧化 DSC 

分 类 号：TB383[一般工业技术—材料科学与工程]