【作者】 张吉阜； 刘敏； 邓畅光； 周克崧； 邓春明； 宋进兵；

【Author】 Jifu Zhang;Min Liu;Changguang Deng;Kesong Zhou;Chunming Deng;Jinbing Song;Guangzhou Research Institute of Nonferrous Metals;

【机构】 广州有色金属研究院；

【摘要】 航空和海洋工程的关键部件在遭受磨损的同时受到海洋苛刻气氛的腐蚀破坏,而采用超音速火焰喷涂(HVOF)金属陶瓷涂层已成为一种新兴防护技术。为考察碳化物类金属陶瓷涂层的在海洋气氛下的抗腐蚀磨损性能,采用超音速火焰喷涂技术制备了WC-10Co4Cr和Cr3C2-NiCr两种典型的金属陶瓷涂层。在自制盐雾喷射腐蚀-磨损装置中,研究了涂层的腐蚀-磨损失效行为,同时与传统的硬铬镀层作对比试验。结果表明,干燥大气条件下铬镀层主要表现为黏着磨损失效行为,Cr3C2-NiCr涂层同时出现黏着磨损与磨粒磨损失效行为,而WC-10Co4Cr则表现为单一的磨粒磨损失效行为。在盐雾气氛条件下,试样易形成液相薄膜,使试样摩擦系数与磨损量均呈下降趋势。摩擦载荷对磨损失效行为的变化具有重要影响,增大摩擦载荷会使Cr3C2-NiCr涂层磨损失重率增加显著,但WC-10Co4Cr涂层的磨损失重率不增反。更多还原

【Abstract】 HVOF cermet coatings have been widely used in aviation and marine fields of key components. Those parts often serve in rigorous environment characterized with salt- fog atmosphere. In order to enhance the wear- and corrosion- resistance of those components, two kinds of cermet coating, that is WC- 10Co4 Cr and Cr3C2- NiCr coating, were prepared by HVOF and then their tribology properties were investigated by a reconstructive friction testing machine equipped with an artificial salt- fog spraying apparatus. As well as, similar research was performed on traditional chrome plating(Cr- plating) for contrasting. Scanning electron microscopy(SEM) and energy dispersive spectroscopy(EDS) were utilized to characterize the wear surface. The results indicated that various coatings exhibited different wear mechanisms. Cr-plating displayed mainly adhesive- wear mechanism, Cr3C2- NiCr coating displayed both adhesive- wear and abrasive- wear mechanism,while WC- 10Co4 Cr displayed mainly abrasive- wear mechanism. At the salt- fog atmosphere, liquid membrane was considered as a factor to reduce the friction- coefficient and wear- rate of the coatings. It was also indicatied that when the contacting pressure of the friction pair was increased, the wear- rate of Cr- plating and Cr3C2- NiCr coating are significantly enhanced, but that of WC- 10Co4 Cr coating is reduced at the opposite way. The phenomenon can ben ascribed to different transformation mechanism of abrasion for various coating at high contacting pressure.更多还原