强激光与粒子束, 2005, 17 (12): 1839, 网络出版: 2006-04-28
金属间化合物Cu4Al纳米微粉的热稳定性研究
Thermal stability of nanocrystalline intermetallic compound Cu4Al powder
纳米Cu4Al微粉 金属间化合物 热稳定 结构相变 ICF靶材料 Powder of nanocomposite Cu4Al Intermetallic compound Thermal stability Structure phase transition ICF target materials
摘要
对采用自悬浮定向流法制备的Cu4Al纳米微粉进行了差热分析(DTA),发现在258,423和537℃存在不同量值的吸热峰.参照DTA曲线上吸热峰所对应的温度,分别对粉末样品进行了模拟退火实验,热处理后样品的X射线衍射(XRD)分析证实258和423℃处无结构相变发生,537℃处的吸热峰则对应于从Cu4Al向Cu3Al的相转变,并且伴随着Cu3Al晶粒的长大.对比实验结果表明,Cu4Al纳米微粉在440℃以下具有非常好的热稳定性,超过537℃将发生结构相变.
Abstract
Thermal stability of nanocrystalline intermetallic compound Cu4Al obtained from flow-levitation method is studied by means of DTA(Differential Thermal Analysis) and XRD(X-Ray Diffraction).By DTA experiments on Cu4Al nanopowder,three endothermal peaks at 258 ℃,423 ℃ and 537 ℃ on DTA curve were found.By XRD experiments on original sample and its heat-treating samples,the results show that the endothermal peak at 537 ℃ is related to the structure phase transition from nanostructure Cu4Al to Cu3Al,accompanying growing up of Cu3Al crystalline grain.The test results are compared and it can be seen that Cu4Al nanopowder possess a nice thermal stability below 440 ℃,and it will bring about phase transition above 537 ℃.
韦建军, 唐永建, 王朝阳, 吴卫东, 王小琴. 金属间化合物Cu4Al纳米微粉的热稳定性研究[J]. 强激光与粒子束, 2005, 17(12): 1839. WEI Jian-jun, TANG Yong-jian, WANG Chao-yang, WU Wei-dong, WANG Xiao-qin. Thermal stability of nanocrystalline intermetallic compound Cu4Al powder[J]. High Power Laser and Particle Beams, 2005, 17(12): 1839.
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