【摘要】 研究了铸造WCP/Ni基合金梯度复合涂层组织与摩擦磨损特性。结果表明,梯度复合涂层与基材实现了良好的冶金结合,涂层内有γ-Ni枝晶组织,γ-Ni+M23C6共晶组织以及凝固结晶析出的M6C、M23C6、M7C3等块状或条状组织;随着铸造WCP体积分数的增加,复合涂层摩擦系数减小,耐磨性增加。19-4试样的耐磨性最高值为4.61,是基材的3倍以上。梯度涂层的磨损机理为磨粒磨损与粘着磨损的复合作用。更多还原

【Abstract】 In order to eliminate cracks produced in the process of laser cladding, a new kind of gradient composite coating is designed. The experimental results indicate that the excellent metallurgical bonding is formed between the gradient composite coating and substrate. There are γNi dendrite structure, γNi+M23C6 eutectic structure and M6C,M7C3,M23C6 in the composite coating. With increment of cast WCP volume fraction,the friction coefficient of the composite coating decreases,but the wear resistance of the coating increases.The wear resistance value of 194 sample is 4.61,and is increased by three times on an average as compared with that of the substrate.The wear mechanism of coatings results from a composite action of abrasive wear and adhesive wear.更多还原