摘要
利用钨极氩弧熔敷技术以钛合金为基底制备了Ti_3SiC_2基复合材料,研究了第二相对复合材料抗氧化性能的影响.高温氧化试验分析结果表明,样品在1 100℃以下的抗氧化性良好;当温度升高到1 200℃时,复合材料的氧化速率变得迅速,符合抛物线-线性氧化规律.XRD,SEM和EDS分析结果表明,复合材料中的主要物相为Ti_3SiC_2,第二相为TiB_2,SiC和TiSi_2相,并且均匀分布在Ti_3SiC_2基体中.热力学分析结果表明,TiB_2和SiC相作为第二相可以提高Ti_3SiC_2的抗氧化性,而TiSi_2相作为第二相则降低Ti_3SiC_2的抗氧化性.
Ti_3SiC_2 based composites were prepared by argon tungsten arc welding on the titanium alloy substrate. The oxidation resistance of matrix and the effect of the second phases on it were investigated. The results of high temperature oxidation experiments showed that the oxidation resistance of the sample was good below 1 100 ℃. However,as the temperature rose up to 1 200 ℃,the oxidation behavior became very rapid and the oxidation kinetics of the sample fitted the parabolic-linear law.The results of XRD,SEM and EDS analyses showed that the main phase of composites was Ti_3SiC_2 and the second phases were TiB_2,SiC and TiSi_2. Furthermore,these second phases distributed uniformly in the matrix. Thermodynamic analysis showed that TiB_2 and SiC as the second phases could improve the oxidation resistance of Ti_3SiC_2,but the role of TiSi_2 was on the contrary.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2017年第10期89-92,共4页
Transactions of The China Welding Institution
基金
湖北省教育厅青年基金资助项目(Q20141103)
关键词
Ti3SiC2基复合材料
钨极氩弧熔敷
第二相
抗氧化性
Ti3SiC2 based composites
argon tungsten arc depositing method
second phases
oxidation resistance
