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Diagnostics of powder particle parameters under laser radiation in direct material deposition

机译:直接材料沉积激光辐射下粉末粒子参数的诊断

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摘要

A comparative analysis is presented for the particle velocity and temperature in the light field of a continuous wave (CW) or pulsed CO2-laser in a coaxial jet gas flow. The problems of measuring the particle velocity and temperature in the light field are solved using noncontact registration methods based on a spectrometer and a combination of laser and optical devices. Alumina, molybdenum, nickel and aluminum powders are used with standard size distributions of the particles. It is shown that, in the field of laser radiation, powder particles get an extra acceleration due to the reactive force resulting from the recoil pressure in evaporation from particles. Laser radiation essentially influences the in-flight velocity of particle velocity and temperature.
机译:在同轴射流气流中,呈现对比较分析的连续波(CW)或脉冲CO2-激光器中的颗粒速度和温度。 利用基于光谱仪和激光和光学装置的组合,使用非接触式配准法来解决测量光场中的粒子速度和温度的问题。 氧化铝,钼,镍和铝粉配上颗粒的标准尺寸分布。 结果表明,在激光辐射领域,由于来自颗粒的蒸发中的反应性导致的反应力,粉末颗粒由于反应性而获得额外的加速度。 激光辐射基本上影响粒子速度和温度的飞行速度。

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