Laser scanning to fabricate spherical powder by “balling effect”
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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。Abstract: 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 vequals laser power P multiplying K,the irregular particle will be transformed into spherical powder.
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Keywords:
- laser technique /
- metal powder /
- balling effect /
- Ti /
- bronze
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