采用图像分析技术对球形Ti-6Al-4V粉末粒形的定量分析

Quantitative Analysis for the Shape Indicator of Spherical Ti-6Al-4V Powder by Image Analysis Method

摘要:

本研究采用图像分析技术对四种不同方法制备的球形Ti-6Al-4V粉末进行粒形的定量分析，分别测量了粉末的球形度、椭圆率、赘生物指数及粗糙度数据。结果表明：4种方法制备的粉末平均球形度均在90%以上。等离子旋转电极雾化法（PREP）、等离子火炬雾化法（PA）、等离子惰性气体雾化法（PIGA）、电极感应熔炼气雾化法（EIGA）制得粉末球形度依次降低，粗糙度依次增加。PREP、PA、EIGA、PIGA法制得粉末的表面卫星球粘附依次增加。对于PREP法制得粉末，粉末粒径范围越细，球形度越高，平均粗糙度越小。粉末粒形指标的差异与其制备方法的原理有关。采用图像分析技术可以实现对金属粉末粒形指标的科学定量分析。

Abstract:

The shape indicators of sperical Ti-6Al-4V powders prepared by four kinds of method were quantitatively analyzed by image analysis technology, The sphericity, ellipticity, outgrow and roughness were measured . The results show the mean sphericity of powders is all above 90%. Sphericity of powders reduces sequentially from plasma rotating electrode process(PREP),plasma torch atomization(PA), plasma inert gas atomization(PIGA) to electrode inert gas atomization(EIGA), while the corresponding roughness successively increases. Satellite ball adhesion on the powder surface increases in turn from PREP, PA, EIGA to PIGA.For powders prepared by PREP method, the finer the particle size range, the higher the sphericity and the smaller the average roughness.The difference of shape indicator is related to the principle of preparation methods. The shape indicator of metal powder can be scientific quantitative analyzed by image analysis technology.