表面硅颗粒整形对高硅铝合金缸套摩擦磨损性能的影响  

Effects of Shaping Silicon Particles on Friction and Wear Properties of Al-Si Alloy Plated Cylinder Liner

作　　者：李承娣 徐佳子 沈岩[1] 金梅[1] 徐久军[1] LI Cheng-di XU Jia-zi SHEN Yan JIN Mei XU Jiu-jun(Key Lab of Ship-Machinery Maintenance ＆ Manufacture, Dalian Maritime University, Dalian 116026, Liaoning)

机构地区：[1]大连海事大学船机修造工程交通行业重点实验室,辽宁大连116026

出　　处：《中国表面工程》2016年第6期8-14,共7页China Surface Engineering

基　　金：国家重大基础研究发展计划(973计划)(2010);国家自然科学基金(51509029);辽宁省教育厅基金(L2015065);中央高校基本科研业务费专项资金(3132015032)

摘　　要：研究了一种新型的高硅铝合金缸套表面处理技术,采用橡胶圈+金刚石颗粒的方式研磨缸套表面,这种表面硅颗粒整形技术可以使硅颗粒凸出表面并且边角圆化。整形处理缸套表面2 min,可制备出凸出高度约为1.2μm,边角轮廓自然圆化过渡的硅颗粒。摩擦磨损试验结果表明,相对于未整形,整形处理后的高硅铝合金缸套的摩擦因数可从0.14降低到0.12,降幅约为14%;磨损量从0.7 mg降低到0.2 mg,降幅约为71%。未整形的硅颗粒表面覆盖一层铝,或与缸套表面保持同一高度。当活塞环与缸套对磨时,铝作为软金属易发生塑性流变,被碾压覆盖到硅颗粒表面上,发生黏着磨损,所以摩擦因数及磨损量较大。而整形后的硅颗粒凸出缸套表面以承担载荷,加强了表面支承力,而且与铝基体共同形成的凹陷处储油,增大润滑效果,同时其边角圆化,避免了应力集中。所以整形技术可以有效地降低高硅铝合金缸套的摩擦因数及磨损量,改善摩擦磨损性能。A new surface treatment technology about A1-Si alloy cylinder liner was studied. By grinding the surface with rubber ring and diamond particles, the silicon particles protruded above the surface and the edges were rounded. When shaping the silicon particles for 2 min, the protrusion height was 1.2 μm with rounded edges. Results of wear test show that compared with the unshaping samples, the friction coefficient of shaping samples can be reduced from about 0.14 to 0.12 （a decline of 14%）, and the weight loss decreases from about 0.7 nag to 0.2 nag （a decline of 71%）, Some unshaping silicon particles are covered by the aluminum layer, and some as high as the surface. When the cylinder liner wears against the piston ring, aluminum as soft metal is easy to generate plastic deformation. Then, aluminum covers above the silicon particles with adhesive wear during friction. This leads to a higher friction coefficient and weight loss. The shaping silicon particles are exposed above the surface to bear load, which strengthens the surface bearing force. The formation of the aluminum matrix can be filled with oil to increase lubrication. The romaded edges can avoid stress concentration. Therefore, shaping silicon particles can effectively reduce the friction coefficient and weight loss to improve the wear behavior.

关 键 词：缸套 边角圆化 摩擦磨损 

分 类 号：TG580.68[金属学及工艺—金属切削加工及机床] TG115.58