等离子喷涂碳化钨涂层组织与喷涂条件的关系

Tungsten Carbide Coatings Prepared by the Low Power Internal Injection Powder Thermal Plasma Spray

将粉末直接输送到低功率等离子喷枪内部阴、阳极之间 ,携带粉末气体转变为等离子体 ,在输入电功能 1 8～ 5 6kW条件下 ,利用低能等离子喷涂铸造 -破碎和烧结 -破碎两种碳化钨粉末 ,沉积效率达到 80 %以上。同时研究了Ar N2 、Ar H2 两种不同等离子气体和不同等离子工艺参数下涂层的组织结构、硬度等的关系。Ar N2 气体成分对涂层硬度的影响大于Ar H2 。

The coatings of tungsten carbide metal were prepared by the low power internal injection plasma spray torch under input power of 1 8～5 6kW The powders were directly fed to the region between the cathode and anode nozzle intake inside the plasma torch, and the carrier gases were transformed to plasma flame The effects of the plasma gases composed of Ar N 2, Ar H 2 on the phases and hardness of the coatings were investigated The results indicated that the effect of Ar N 2 on the change of hardness for the coating was greater than that of Ar H 2 gas The parameters of spraying were suggested