高能球磨制备Mo-3%Cu纳米晶复合粉末特性

Characteristics of high energy milled Mo-3%Cu nanocomposite powders

利用机械合金化法制备出Mo-3%Cu(质量分数,以下同)超细复合粉末,采用X射线衍射、BET氮吸附法和DTA差热分析方法对球磨后的Mo-6%Cu纳米晶复合粉的组织结构变化、表面特性和热稳定性进行了系统的研究。结果表明,高能球磨可以制取纳米晶复合粉末,晶粒内部产生很大的晶格畸变,同时球磨产生的晶体缺陷使原子扩散加快,形成Mo-Cu超饱和固溶体和扩大Mo在粘结相中的溶解度,BET氮吸附结果证实了球磨使粉末产生大量微孔,且比表面、中孔表面和孔径降低。

Mo-3wt%Cu ultrafine composite powder was prepared by mechanical alloying process, systematic investigeation were carried out on the structural change. Surfacial characteristic and thermal stability of the Mo-3wt%Cu high energy milled powders using a combination of X-ray powder diffraction, brunauer-emmett-teller （BET） nitrogen adsorption technique and differential thermal analysis assited by DTA. The experimental results showed that ball-milled could produce an ultrafine composite powedrs in which large lattice distortion, supersolidus solution and solubility extension of Mo in phase were occurred due to the fast diffusion induced by high density of lattice defects and nanograin boundaries. BET results provide a further evidence that milling led the specific surface area of powedrs surface meso pore, pore size to decrease and micro pores to produce.