【作者】 赵燕伟；

【导师】 侯俊英；

【作者基本信息】 青岛科技大学 ， 材料加工工程， 2010， 硕士

【摘要】 Ni-P-SiC化学复合镀是在化学镀溶液中加入不溶性的SiC粒子,使其分散于溶液中,实现SiC粒子与基质金属的共沉积,制备硬度高、耐磨性好的复合镀层的一种化学复合镀技术。复合镀层性能的优劣取决于粒子在镀层中的分布和复合量等因素,而粒子能否共沉积取决于粒子在化学镀液中的分散程度。然而如何使SiC粒子较好的分散于溶液中,一直是人们研究的热点。采用盐酸活化、加入表面活性剂和预镀三种手段对SiC粒子进行了预处理,改变了SiC粒子的表面状态,并将经过上述三种处理的SiC粒子分别加入到化学镀液中进行复合镀试验。用XJP-6A型金相显微镜进行了镀层外观和镀层金相组织的观察,用弯曲试验法测定了镀层与基体的结合力,用HVS1000型数显显微硬度计测定了镀层的显微硬度,用贴滤纸法测定了镀层的孔隙率,用SEM和EDS对镀层的形貌和元素组成进行了分析。结果表明,预处理过的SiC粒子在Ni-P-SiC化学复合镀中较好地实现了SiC粒子在化学镀溶液中的分散,粒子在镀层中分布均匀,粒子的复合量良好;其中预镀后所得到的复合镀层性能最优良。对MPX-2000型盘销式摩擦磨损试验机进行了改装,使其对耐磨性的测试更加便捷、高效。用改装后的摩擦磨损试验机对SiC粒子未经处理所得到的复合镀层、SiC粒子经盐酸活化处理所得到的复合镀层、SiC粒子经表面活性剂处理所得到的复合镀层、SiC粒子经预镀处理所得到的复合镀层的耐磨性进行了试验,研究了镀层耐磨的原因及磨损机理。结果表明添加经预镀处理后SiC粒子后所得到的复合镀层耐磨性更优。更多还原

【Abstract】 Ni-P-SiC composite plating is a technology to form composite coatings with high hardness and high wear resistance, in which insoluble SiC particles are added and dispersed in plating solution to realize the codeposition of SiC particles and Ni-P base metal. The performances of composite coatings depend on many factors such as the distribution of particles and the particles content in composite coatings, while the particle deposition depends on the dispersion of particles in the chemical plating bath. But how to get a good deposition of SiC particles in the solution still remains a focus for researchers.Three pretreatment methods such as HCl activation, surface active agents and pre-plating are used to change the surface morphology of SiC particles, and then composite plating experiments are performed by adding the particles into composite plating solution, respectively. The appearance and microstructure of coatings are observed by XJP-6A type metallurgical microscope. The bonding strength between coatings and the matrix is determined by bending tests. The micro hardness of coatings is measured by HVS1000 type digital micro hardness tester. The porosities of coatings are determined by posts filter paper method. The morphology of coatings is observed by SEM, and elements were analyzed by EDS. Results show that, better dispersion of SiC particles in the chemical plating solution are achieved by adding the pretreated SiC particles using all the three methods into Ni-P-SiC composite plating. The particles are evenly distributed in coatings and better composite quantities are obtained. Among the three methods, the plating coatings obtained by adding pre-plating particles have the best performance. The MPX-2000 type plate pin friction and abrasion tester is modified, which made the abrasion test of the tester more convenient and efficient. The wear resistances of composite coatings obtained with different treatment methods are tested by this modified tester. The cause of coatings with good abrasion performance and the abrasion mechanism of the coatings are investigated. Comparison between test results indicates that the composite coatings with the best wear resistance are obtained by adding pre-plating SiC particles.更多还原