In the construction process of oil and gas drilling, the joint drill wear, eccentric wear and threaded partial adhesion caused drilling damage and then evolved into the major mine accidents.
在石油天然气钻井施工过程中，常常造成钻具接头磨损、偏磨及丝扣粘连，这是引起钻具损坏进而演化为井下事故的主要原因之一。
The wear mechanism of C/C composites in braking have been inquired , they were abrasion, delamination of part of the friction film, oxidation wear and adhesion wear.
探讨了C／C复合材料的磨损机理，主要有磨粒磨损、剥层磨损、氧化磨损、粘着磨损。
The experimental results showed that the blackening film possessed strong adhesion, uniformity in color, excellent luster and better corrosion-and wear resistance.
结果表明：该工艺着色时间短、环境污染小、黑膜附着力强、光泽性好；
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