【作者】 王树林； 李生娟； 童正明； 李来强；

【Author】 WANGShu- tin, LI Sheng-juan, TONG Zheng- ming,LI Li- qiang(Department of Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093, China)

【机构】 上海理工大学化工过程机械研究所；

【摘要】 纳米颗粒制备、机械合金化、以及化学反应磨这三大研究方向,构成了机械方法制备纳米粉体的研究核心,在纳米科技发展中占有十分重要的地位。根据振动混沌控制和应力释放原理,本文中成功地在室温下利用容积为2.5 L的滚压振动磨干法高效节能地制备了纳米锌片。经过5h振动加工后,得到了几何形状均匀、形貌规则、界面清晰和透明的锌纳米片,其厚度在10μm左右。径向尺度在100-250nm之间,成片率达100%。根据锌的晶体结构特征,纳米片的这一转变过程主要是沿着最密排晶面[0001]的长大和延伸。同时,本文中还成功地在室温和无冷却状态下制备了铝钛非晶合金,X射线衍射分析表明,经过300h振动球磨后,铝钛粉末基本完全非晶化,而且合金化程度很高。非晶化动力主要源自原子的界面扩散和材料的热力学不稳定状态。更多还原

【Abstract】 Playing a very important part in the development of nano - science and technology, vibro - nanoscience containing nano - particle vibration manufacturing and mechanical alloying as well as chemical reaction milling has been attracting more and more interest and attention of researchers in various disciplines. Here we show that zinc nano - flakes can be cost - effectively manufactured in dry operation mode and at room temperature by the inventive rolling vibration mill of container volume 2.5 L without any cooling measure.In 5 hours milling all the initial 150 - gram Zinc powder of mean diameter 3 - 10 μm is transformed into geometric uniform,morphological homogenous,boundary clear, and transparent nano- flakes of about 10 nm thin and 100:250 nm wide.Furthermore,with the same device and procedure we also succeeded in amorphous alloying from the blend of Ti - 64 % and Al - 36% elemental powder. X - ray diffraction pattern and electron microscopy observations revealed that the alloying degree is high, and the amorphism is thoroughly, which seems to originate from boundary diffusivity of atoms and the thermodynamic unstable state of the materials.更多还原