冷喷涂特性  

Characteristics of Cold Spray Process

作　　者：李文亚[1] 李长久[1] 

机构地区：[1]西安交通大学机械工程学院焊接研究所,陕西西安710049

出　　处：《中国表面工程》2002年第1期12-16,共5页China Surface Engineering

基　　金：2001年国家自然科学基金(50171052)

摘　　要：冷喷涂技术是近年来发展起来的新型喷涂技术,该方法通过低温(< 600 ℃)的高速固态粒子与基体发生塑性碰撞而实现涂层沉积,可以避免喷涂材料在喷涂过程中受热影响而发生氧化、分解等,可以将喷涂材料的组织结构在不发生变化的条件下移植到基体表面。简要介绍了冷喷涂技术的原理与特点、冷喷涂层的组织结构与性能以及涂层沉积特性与行为的研究现状。粒子的速度对于涂层的沉积起着决定性作用,对于一定的材料存在一临界速度,约为500～600 m/s,当粒子速度超过该临界速度后,随着速度的增加,沉积效率增加,最高可以达到80%以上。迄今的研究表明,冷喷涂可以实现大多数金属材料甚至金属陶瓷材料的沉积。Cold spray is a rapidly emerging coating technology, in which the spray particles in solid state can be deposited through the plastic impact on substrate with high velocity under a low temperature (< 600℃). During deposition, spray materials experience only little change in microstructure and can avoid evident oxidation or decomposition. The principle of cold spray and the characteristics of particle deposition were reviewed. Particle velocity is an important parameter in cold spray process. There exists a critical velocity at 500-600m/s depending on spray materials. When particle velocity exceeds the critical velocity, the deposition efficiency is increased with an increase of particle velocity, and can reach 80%. Most metallic materials, even cermet materials can be deposited by cold spray process.

关 键 词：冷喷涂 临界速度 沉积效率 金属刀涂层 

分 类 号：TG174.442[金属学及工艺—金属表面处理]