激光扫描金属粉末的“球化效应”及其应用  

Laser scanning to fabricate spherical powder by "balling effect"

作　　者：欧阳鸿武[1] 刘卓民[1] 黄誓成[1] 王琼[1] 张新[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《激光技术》2008年第6期572-575,共4页Laser Technology

基　　金：国家自然科学基金资助项目(50574103)

摘　　要：为了利用激光束扫描金属粉末时的"球化效应"将异形金属粉末球化,通过采用正交实验法,系统探明了获得球化效果的激光工艺参量,得到相应的球形粉末。结果表明,金属粉末的球化能力决定于金属粉末的粒径、导热性、熔点和激光吸收率等因素,可用球化因子K表征;当激光扫描速度与激光功率(高于临界功率后)的比值大致等于K时,可获得球形粉末。This study is carried on to explore a feasible approach to transfer the irregular powder, such as Ti powder and bronze powder,into spherical powder by ＂balling effect＂. The results indicate that： （ 1 ） the balling ability of mental powder can be ranked by a balling factor K which accounts for the influence of particle size, density, special thermal property, boiling point as well as laser absorbing rate ; （ 2 ） when the scanning speed v equals laser power P multiplying K, the irregular particle will be transformed into spherical powder.

关 键 词：激光技术 金属球形粉末 球化效应 钛 青铜 

分 类 号：TG156.99[金属学及工艺—热处理]