高速电弧喷涂电流波动对涂层性能的影响

电弧喷涂时的电压和电流是对喷涂层性能有重要影响的两个电参数。由于喷涂过程中电压的波动范围不大 ,而电流的波动范围较大 ,因此喷涂电流的波动对电弧喷涂过程的稳定性及涂层质量的影响更为突出。在保持其它参数 (如雾化气体压力、喷涂距离、喷枪角度等 )不变的前提下 ,研究了高速电弧喷涂时的电流波动率对涂层的孔隙率、显微硬度、耐磨性等方面的影响 ,当电流波动幅度减小时 ,涂层的综合性能将会得到提高。文中从理论上对电流波动影响涂层性能的机理进行了分析 ,认为电流波动造成电弧喷涂雾化粒子尺寸、温度、空间分布等不均是造成涂层综合性能不高的主要原因。

Influences of Current Fluctuation on Properties of HVAS Coating

The voltage and the current are the two main parameters in high velocity arc spray (HVAS) system.The fluctuation of current is larger than that of voltage in arc spray process.So the fluctuation of current is of importance to the quality of coatings and the stability of arc spray process. In this paper,the influences of the current fluctuation to the porosity,hardness and abrasiveness of coatings are studied under the condition of the other parameters keeping constant.The fluctuation of current can induce the reduction in hardness and abrasiveness of coating,and the increase in porosity of coatings.So the properties of coating will be worse.The reason is that the larger fluctuation of current causes the larger nonuniformity in the size,temperature and distribution of spraying particles.