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活塞环是内燃机中重要的摩擦元件之一,它的耐磨性、气密性、润滑和传热作用等直接影喻着发动机的功率、油耗和修理周期。目前国外汽车的活塞环使用寿命可以达20万公里以上,在我国使用的进口新汽车的原厂活塞环其使用寿命也可以达18万公里以上;而国产解放牌汽车活塞环先进水平是十万公里,不镀铬的活塞环仅为5—6万公里,国内外差距很大。使用寿命短的原因,除了环的磨损和折断外,材质的热稳定性差也是一个很重要的因素,即活塞环在缸体内高温工作一段时间以后,弹力衰减严重,起
Piston ring is one of the most important friction elements in internal combustion engine. Its wear resistance, airtightness, lubrication and heat transfer directly affect the power, fuel consumption and repair cycle of the engine. At present, the service life of piston rings of foreign cars can reach more than 200,000 km. The original piston rings of imported new cars used in China also can reach the service life of more than 180,000 km. The advanced level of domestic-made Jiefang brand car piston rings is 100,000 Km, non-chrome-plated piston ring is only 5-6 million km, a great gap at home and abroad. Short life reasons, in addition to ring wear and tear, the poor thermal stability of the material is also a very important factor, that is, after the piston ring in the cylinder at high temperature for some time after the elastic attenuation serious