摘要
采用粉末冶金法制备Cu/V0.97W0.03O2复合材料,通过场发射扫描电镜及能谱分析研究复合材料的表面形貌与成分组成,用X-ray衍射分析复合材料中各相在室温下的晶体结构,并利用涡流电导仪测试在变温过程中不同V0.97W0.03O2粉体含量的复合材料电导率的变化情况。结果表明:Cu/V0.97W0.03O2复合材料在0℃附近表现出电导率突变的特性,而且随复合材料中V0.97W0.03O2粉体添加量的增加,复合材料电导率突变的效果明显增加;同时,在室温下Cu/V0.97W0.03O2复合材料中V0.97W0.03O2的晶体结构与VO2高温相的结构基本相同,说明在复合材料的烧结过程中Cu与V0.97W0.03O2的晶体结构没有相互影响,但V0.97W0.03O2有少量发生分解。
CH/V0.97W0.03O2 composite materials were prepared by powder metallurgy. The composition and surface microstructure were analyzed by SEM and EDS, the crystals structure in room temperature was detected by XRD, the conductivity of different V0.97W0.0302 doping rates composite during changing temperature was tested by Eddy current electric conductance meter. The results indicate that Cu/V0.97W0.03O2 composite materials exhibit an abrupt change of conductivity when the temperature is near 0℃ the range of change increases with increasing the amount of V0.97W0.03O2. Meanwhile, the crystal structure of V0.97W0.03O2in Cu/V0.97W0.03O2 composite materials is the same as tetragon phase VO2, which indicates that there is no interaction on crystal structure between Cu and V0.97W0.03O2, however, a small amount of V0.97W0.03O2 decomposes in the sintering process.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2013年第1期53-58,共6页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金重点项目(No.50834003)
陕西省重点学科建设专项资金资助项目
关键词
复合材料
VO2
掺杂
相变
composite material
VO2
doping
phase transition
