【作者】 潘邻； 高万振； 潘春旭； 陶锡麒； 夏春怀；

【Author】 PAN Lin;GAO Wan-zhen;PAN Chun-xu;TAO XI-qi;XIA Chun-huai;Wuhan Research Institute of Materials Protection;School of Physical Science and Technology,Wuhan University;

【机构】 武汉材料保护研究所； 武汉大学物理科学与技术学院；

【摘要】 本文系统研究了钴基合金激光熔覆层和钴基合金/WC激光熔覆复合涂层的组织、硬度梯度及摩擦学特性,并与钴基合金等离子喷焊层进行了对比。研究表明,钴基合金的激光熔覆层和等离子喷焊层均具有凝固组织特征,碳化钨加入后,激光熔覆复合涂层的凝固组织的基本特征没有改变;随着钴基合金加入中碳化钨颗粒,凝固组织的尺寸减小,硬度提高。激光熔覆钴基合金层比等离子喷焊钴基合金层具有较低的摩擦系数和较高的耐磨损性能;碳化钨的加入,能有效地降低涂层的摩擦系数、减小磨损率;随着试验温度的提高,涂层的摩擦系数降低,耐磨损性能提高。更多还原

【Abstract】 In this paper, the micostructures, microhardness and tribological properties of laser cladding Co-based alloy layer and laser cladding Co-based alloy / WC complex coating were studied, and comparative studied of plasma transferred arc layer. The results show that laser cladding Co-based alloy layer and plasma transferred arc layer was consistent with the feature of solidification structure, and the basic solidification microstructure of the laser cladding layers was not altered, but the WC particles affected the solidified pattern of eutectic structure in the dendrite when the WC particles were added. When it was added into the Co-based alloy, the size of the solidification microstructure was decreased and the microhardness was improved. The laser cladding coatings with a lower friction coefficient and higher wear resistance than plasma transferred arc(PTA) coating; the friction coefficient and wear rate of the coatings can are reduced effectively when adding WC particle; the friction coefficient is reduced and wear resistance is improved for the coatings as the testing temperature increase.更多还原