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日本发明一种喷钼活塞环,其喷钼层兼有优良的耐熔着磨损特性和耐磨性。以下简要介绍此种喷钼活塞环及其制造方法。 为改善活塞环的耐磨性,人们给活塞环表面镀上硬铬层。此硬铬层硬度高,具有优良的耐磨性。可是,硬铬层保油性差,加上铬的熔点低（1863℃）,滑动中容易熔着拉伤气缸。近年来,人们以喷钼环代替镀铬环。 金属钼本身具有良好的摩擦特性,特别是喷钼层表面为多孔质的,有良好的保油性,而且,钼的熔点高（2623℃）,不容易引起熔着磨损。但是,钼的硬度比硬铬层低,其耐磨性也远不及硬铬层强,人们期望能有一种耐磨性强而又不会产生熔着磨损的活塞环。
Japan invented a spray molybdenum piston ring, the molybdenum spray layer both excellent wear resistance and abrasion resistance. The following is a brief description of such a molybdenum piston ring and its manufacturing method. In order to improve the wear resistance of the piston ring, the piston ring surface is coated with a hard chromium layer. This hard chrome layer high hardness, with excellent wear resistance. However, the hard chrome layer of poor oil, plus the low melting point of chromium (1863 ℃), easy to melt sliding friction cylinder. In recent years, people replace molybdenum rings with molybdenum rings. Metallic molybdenum itself has good friction properties, especially molybdenum sprayed surface is porous, good oil-conserving, and, high melting point of molybdenum (2623 ℃), not easy to cause melting wear. However, the hardness of molybdenum is lower than that of hard chromium layer, and its wear resistance is far less than that of hard chromium layer. It is expected that there will be a piston ring with strong abrasion resistance and no weld wear.