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利用CO2激光对火焰喷涂制备的Ni-WC复合涂层进行了重熔实验,通过扫描电镜(SEM)观察了其重熔后表面形貌,测试了含有不同WC体积分数样品重熔前后的涂层显微硬度,并分析了WC含量对涂层组织及耐磨性的影响。实验结果表明,火焰喷涂制备的涂层气孔随着WC颗粒含量增大而增多,经激光重熔后气孔明显减少;激光重熔后的涂层显微硬度比火焰喷涂的涂层显微硬度提高约20%,WC体积分数为6%时涂层显微硬度达到最大值;激光重熔处理后的涂层耐磨性随着WC含量的增加而增大,WC体积分数为6%时,其耐磨性达到最佳值。
The CO2 laser was used to remelt the Ni-WC composite coating prepared by flame spraying. The surface morphology after remelting was observed by scanning electron microscopy (SEM). The coatings before and after remelting with different WC volume fraction The microhardness was analyzed. The effect of WC content on the microstructure and wear resistance of the coating was analyzed. The experimental results show that the porosity of the coating prepared by flame spraying increases with the increase of the content of WC particles, and the porosity decreases remarkably after laser remelting. The microhardness of laser remelted coating is higher than that of flame sprayed coating About 20%, and the volume fraction of WC is 6%, the microhardness of the coating reaches the maximum value. The wear resistance of the coating after laser remelting increases with the increase of WC content. When WC volume fraction is 6% Wear resistance to achieve the best value.