油膜的英文

Although one of the mian purposes of lubrication is to reduce friction ,any substance—liquid,solid,or gaseous—capable of controlling friction and wear between sliding surfaces can be classed as a lubricant. 虽然润滑的主要目的是减少摩擦，但任何物质——不管液态、固态还是气态，只要能减少滑动面之间的摩擦和磨损，都可以称之为润滑剂。 Varieties of lubrication 润滑的种类 Unlubricated sliding. Metals that have been carefully treated to remove all foreign materials seize and weld to one another when slid together. In the absence of such a high degree of cleanliness, adsorbed gases, water vapor, oxides, and contaminants reduce friction and the tendency to seize but usually result in severe wear; this is called “unlubricated” or dry sliding. 无润滑摩擦。在摩擦过程需要对金属进行严格处理以除去润滑过程中所有外来物质。由于无法实现如此高的清洁度，摩擦面中的气体，水蒸汽，氧化物及其他污染物会在此过程中减少摩擦力及咬合的趋势，但也往往导致更严重的磨损；这种情况被称为“无润滑”或干摩擦。 Fluid—film lubrication. Interposing a fluid film that completely separates the sliding surfaces results in fluid—film lubrication .The fluid may be introduced intentionally as the oil in the main bearings of an automobile, or unintentionally, as in the case of water between a smooth rubber tire and a wet pavement . Although the fluid is usually a liquid such as oil, water, and a wide range of other materials, it may also be a gas .The gas most commonly employed is air. 流体膜润滑。在摩擦面中插入流体膜并将摩擦面完全分隔开这样形成流体膜润滑。流体膜可能是故意引入的，例如汽车主轴承中的机油，也有可能是无心引入的，例如光滑的橡胶轮胎与湿路面之间的水。尽管流体膜大部分时候采用的是机油，水，和其他各种材料的液态物，实际上也可以采用气体来做流体膜。通常用的最多的是空气。 PS：fluid film 大部分时候都被翻作“油膜”或“液膜”，但这里既然最后提到了气体来做润滑，所以我只能采用了“流体膜”这种翻法...