碰撞对喷涂陶瓷涂层粒子的影响

Influence of Collision on Particles Flame Sprayed Ceramic Coatings

通过Ti-B4C-C喷涂体系的自蔓延反应火焰喷涂TiC-TiB2复相陶瓷涂层试验,研究了喷涂过程中处于自蔓延反应状态的飞行粒子与基体的碰撞行为,分析了飞行粒子的反应中间状态及其与基体碰撞变形形态,揭示了碰撞造成粒子自蔓延反应终止的本质原因。结果表明,飞行粒子的自蔓延反应是由表向内进行的,碰撞极大地影响飞行粒子的自蔓延反应进程,由于碰撞压缩弹性波作用、接触物理介质突变和热传导快速凝固等三方面作用导致飞行粒子的自蔓延反应终止。

Based on SHS reactive flame spraying TiC-TiB2 multiphase ceramic coating technology, the collision behavior of the flying particles with the substrate was investigated. Different morphologies of the collided particles were observed and their causes of formation were analyzed. The results show that the SHS reaction of the flying particles undergo from surface to inside. Collision gives remarkable influences on flying combustion and solidification and structure transformation. The SHS reaction of the flying particles can be terminated by the effects of dense elastic wave, mutation of physical medium and rapid solidification for heat exchange.