At the same time, the turn-around ring of the hammer head is made of special composite material, with the qualities of wear-resisting, self - lubricating, non-maintaining, easy changing etc.
同时锤头回转圈采用特殊复合材料，具有耐磨、自润滑、免维护、易更换等特点。
Self-lubricating composite which possesses superior antifriction and wear resistance has been one of the central issues for advanced material research.
具有优良减摩耐磨性能的自润滑材料是材料研究的热点领域之一。
This means that rectorite is a good material for preparation of the thickening agent of lubricating grease and is a new high heat-resistance lubricating grease.
研究表明，累托石是制备润滑脂稠化剂的好原料，累托石润滑脂是一种新型高温润滑脂。
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