非接触式测试技术在气雾化制粉研究中的应用-中国材料进展

文章信息/Info

Title:: Application of NonContact Measurement Techniques in Gas Atomization Powder Preparation Research

Author(s):: LIU Yang; ZHANG Guoqing; LI Zhou; XU Wenyong; ZHENG Liang; YUAN Hua; LIU Na; (Science and Technology on Advanced High Temperature Structural Materials Laboratory, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China)

Keywords:: non-contact measurement; gas atomization; flow field morphology; velocity distribution; droplet size distribution; temperature

摘要:: 气雾化制粉是目前大规模制备高品质合金粉末的主流工艺，在粉末冶金、增材制造、热喷涂、钎焊等领域具有广泛的应用价值。雾化过程决定最终粉末的品质，因此开展气雾化过程研究具有重要的意义。传统研究气雾化制粉过程的方法多采用接触式测试技术，通过设计实验间接进行研究，存在周期长、成本高、与实际工况差别较大、无法进行瞬态研究等缺点，对气雾化机理研究和气雾化系统结构设计的指导价值非常有限。近年来，国内外学者借鉴流体力学领域的一些测试技术，开展了气雾化过程非接触式测试实验研究。根据研究对象分类，对适用于流场形貌、速度分布、液滴粒径分布以及温度场研究的非接触式测试技术进行了综述，阐述了这些技术的原理以及应用，并对气雾化过程测试技术的未来发展方向进行了展望。

Abstract:: Nowadays gas atomization is the main technology for large-scale preparation of high-quality alloy powder. The gas-atomized powders possess the advantages of homogeneous composition, narrow particle size distribution, low impurity gas content, low inclusion level and high sphericity. It is widely applied in the fields such as powder metallurgy, additive manufacturing, thermal spraying and brazing. The atomization process determines powder quality, therefore it is significant to study the atomization process. The traditional methods mostly use the contact measurement technology through indirect experiments, which have many disadvantages such as time consuming, high cost, difference with actual conditions, and difficulty of carrying out transient process research, and bring less guidance to the study of atomization mechanism and the structure design of atomization system. In recent years, scholars have utilized some non-contact measurement experiments used in the field of hydrodynamics. According to the classification of the research objects, the non-contact measurement techniques adaptive for the study of flow field morphology, velocity distribution, droplet size distribution and temperature field are summarized, the principles of these techniques and some related applications are introduced, the future development direction of the measurement techniques for gas atomization process is prospected.