摘要
在冷喷涂过程中,粉末颗粒被超音速压缩气流加速以固态沉积到基体上获得涂层,且只有颗粒速度高于临界速度且低于冲蚀速度时才能与基体成功结合。临界速度的概念对冷喷涂过程中涂层结合、涂层质量、优化工艺过程等问题的研究有重要意义。然而文献中对临界速度的定义及估算方法不一,导致同一种材料的临界速度差异较大(如Cu/Cu的临界速度从310m/s到580m/s)。本文综述了临界速度的各种定义与判据方法,并总结了影响临界速度的因素。
During cold spray process,the coating is obtained when powder particles are accelerated to high velocity with solid state by using a supersonic compressed gas.The combination of particle/substrate can be successfully realized only when the particle velocity ranges from critical velocity to erosion velocity.Critical velocity concept plays a significant role in the research on coating bonding,coating quality and optimization of the technological process.However,there are various definition and estimation methods for critical velocity in the literatures.As a result,the critical velocities of the same material obtained by different methods have great differences(for example,the critical velocity of Cu/Cu can vary from 310m/s to 580m/s).In the text,various concepts and calculation methods of critical velocity are reviewed,and the influence factors of critical velocity are also summarized.
出处
《热喷涂技术》
2015年第4期1-16,共16页
Thermal Spray Technology
关键词
冷喷涂
临界速度
影响因素
综述
Cold spray
Critical velocity
Influence factor
Review
