原位自生钛基复合材料高温氧化表面分析  

Surface Analyses of High-Temperature Oxidized In-situ Synthesized Titanium Matrix Composites

作　　者：王悔改[1,2] 陈慧敏[1,2] 王非[3] 魏尊杰[3] 宋延沛[1,2] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471003 [2]河南省有色金属材料科学与加工技术重点实验室,河南洛阳471003 [3]哈尔滨工业大学金属精密热加工国防科技重点实验室,黑龙江哈尔滨150001

出　　处：《铸造》2009年第1期39-42,共4页Foundry

摘　　要：利用海绵钛、高纯铝与TiC/Al中间合金的反应，采用非自耗电弧熔炼工艺，原位合成Ti—11Al-1．5C复合材料。将复合材料置于700-900℃的静止空气中氧化不同的时间，分析氧化时间、温度等因素对复合材料氧化动力学行为的影响。用配有能谱分析仪的扫描电镜对氧化层表面的显微结构及成分进行分析。结果表明，复合材料的氧化动力学曲线主要为抛物线类型；从低温短时氧化到高温长时氧化，氧化表面由接近基体本身的浅黄绿色逐步向深黄色转变，氧化产物则由TiO2和Al2O3的不均匀混合物层逐步转化为均匀的TiO2柱状六方晶层。The in-situ synthesized Ti matrix composites of Ti-11Al-1.5C has been successfully fabricated using the reaction between titanium （Ti） sponge, high purity aluminum （AI） and TiC/AI master alloy with non-consumable arc melting technique. The composites were oxidized at 700-900℃ in still air for different time. The influences of oxidation time and temperature on oxidation kinetics of composites were analyzed. The surface morphologies and components of the oxidation surface were examined using scanning electron microscope （ SEM ） with energy dispersive spectrometer （ EDS ）. The results show that the isothermal oxidation kinetic curves of composites mainly follow parabolic rate law. When the composites oxidized at low temperature for short time, the color of oxidation surface is shallow olivine which is similar to the color of the matrix and the oxides exist in non-uniform mixture state of TiO2 and Al2O3. While as the composites oxidized at high temperature for long time, the color of oxidation surface is transferred to deep yellow and the oxides are mainly columnar hexagonal TiO2.

关 键 词：钛基复合材料 高温氧化 氧化动力学 表面分析 

分 类 号：TB33[一般工业技术—材料科学与工程]