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通常就金属表面处理所获得的复层来说,可以分为三类:表面转化复层、转移镀层和沉积涂层。所谓沉积涂层,就是采用热喷涂方法将预先选择的涂层材料加热熔融后以高速喷射到基材表面,使之产生强烈变形而堆积形成涂层的一种工艺方法。形成的涂层与基材间除机械式啮合外,由于颗粒以高温、高速对基材的瞬时作用,还有着冶金相的熔合和物理粘结。除纯钼涂层外,它还包括钼基合金、铬基合金、陶瓷及金属陶瓷涂层等等。获得的涂层以提高初期磨合性和耐磨损、耐腐蚀等为主要目的。 按热源形式分类,该工艺方法主要有火焰喷涂、电弧喷涂和等离子体喷涂。火焰喷
Usually for metal surface treatment of the obtained complex, can be divided into three categories: surface conversion layer, transfer coating and deposition coating. The so-called deposition coating, is the use of thermal spraying method pre-selected coating material heated to melt high-speed jet to the surface of the substrate, resulting in intense deformation and accumulation of a coating process. The formation of the coating and the substrate in addition to mechanical meshing, due to the particles at high temperature, high speed transient effect on the substrate, there are metallurgical phase fusion and physical bonding. In addition to pure molybdenum coating, it also includes molybdenum-based alloys, chromium-based alloys, ceramic and cermet coatings and more. The obtained coating is mainly for the purpose of improving initial run-in, wear resistance, corrosion resistance and the like. According to the form of heat sources, the main methods of flame spraying, arc spraying and plasma spraying. Flame spray