中南工业大学学报(自然科学版)2001，Vol.32Issue(1)：78-80,3.
热压碳化硼表面自润滑膜的生成
Formation of self-lubricating surface films on hot-pressed boron carbide
吴芳 1王零森 1张金生 1樊毅 1刘伯威 1高游1
作者信息
摘要
Abstract
In this paper, the authors describe the formation and self-lubricating mechanisms of a surface film on hotpressed boron carbide ceramic. Under the test condition, the sliding friction coefficients of as-received B4 C/B4 C ring-onring pair are quite high at 0.35～0.40 and then decrease with sliding distance to 0.25 as the tribochemical reaction produces B2O3/H3 BO3 film on sliding surface. To induce a complete film forming on the sliding surface can make the friction coefficients decrease further. The annealing heat-treatment is a simple method. B4C undergoes oxidation and forms a layer of boron oxide ( B2 O3 ) in the upper surface. While cooling to room temperature, the B2 O3 reacts with moisture in the air to form a secondary film, boric acid (H3BO3). The sliding friction coefficient of B4C pair after annealing is as low as 0.08. The low-friction mechanism of boron acid is associated with its layered-triclinic-crystal structure. The atoms on each layer are closely packed and strongly boned to each other but the layers are widely separated and are held together by van der Waals force. During sliding, these atomic layers can align themselves parallel to the direction of relative motion and slide over one another to provide low friction coefficients reported here.关键词
碳化硼/摩擦因数/自润滑/表面膜分类
化学化工引用本文复制引用
吴芳,王零森,张金生,樊毅,刘伯威,高游..热压碳化硼表面自润滑膜的生成[J].中南工业大学学报(自然科学版),2001,32(1):78-80,3.
