High temperature solid lubricants are required for use on silicon nitride bearings with application temperatures of 600℃ and beyond. Research on cesium oxythiomolybdate, Cs2MoOS3 was initiated as a response to the requirement for a high temperature solid lubricant for lightweight single-use engines. These engines would most likely use ceramic bearings. Ceramics are a natural choice for engine components due to their lower density, higher melting points, and greater oxidation resistance than typical metals w1x. In aerospace applications, silicon nitride became a leading candidate for ceramic bearings because of its excellent high temperature properties. Lubricants for these bearings were required for operation between -50 and +800 ℃. Cesium oxythiomolybdate has been shown to be an effective high temperature solid lubricant when used in a coating with a sodium silicate binder, giving a coefficient of friction of below 0.2 at 650 ℃. The purpose of the solid lubricant is to protect the underlying substrate for the life of the engine. The lubricant must have low shear strength and adhere well to the substrate over the temperature range of interest.
本文由桑尧热喷涂网收集整理。本站文章未经允许不得转载；如欲转载请注明出处，北京桑尧科技开发有限公司网址：http://www.sunspraying.com/
|
