高能机械化学法制备微纳米MoC粉体及涂层磨损试验研究

Micro/Nanometer MoC Powders Prepared by High-Energy Mechanochemistry Method and Coating Abrasion Test

室温下利用自行设计的高能机械化学球磨机,将钼粉在煤气气氛中通过高能球磨得到了微纳米碳化钼粉体。利用XRD和SEM对制得粉体的物相及粒度分析表明:在球料比为8∶1,球磨时间为30 h条件下,得到了微纳米MoC粉体,粉体平均粒度在100 nm以内。将不同比例的微纳米MoC粉体掺入N i60金属合金喷涂粉,利用等离子喷涂在40C r钢基体表面形成金属陶瓷涂层。磨损试验表明,用掺入微纳米MoC粉体的喷涂粉喷涂样品表面,样品耐磨性显著提高。

Micro/nano-meter MoC powder was prepared by using a high-energy self-designed mechanochemistry ball mill machine, through the reaction of molybdenum and CO at room temperature. The phase and the particle size of powders were investigated by XRD and SEM. Results showed that when the weight ratio between the balls and the powder charge was 8： 1, and after 30 h of millings, the micro/nanometer MoC powders were obtained. The average particle size was within 100 nm. The ceramal coating was formed on the 40Cr steel base using plasma spray method by mixing micro/nano-meter MoC powder and Ni60 alloy powder with different ratio. Coating abrasion test showed that the wear-resisting property of samples could be improved greatly.