碳化铬金属陶瓷SHS熔覆层的磨料磨损机理研究

Abrasive Wear Mechanism of SHS Coatings of Chromium Carbide Cermet

研究了用自蔓延高温合成技术获得的碳化铬金属陶瓷熔覆层在两体干摩擦状态下的磨料磨损性能。结果表明，该熔覆层具有致密的网状碳化物结构，在硬性磨料的切削作用下，磨屑自碳化物网间的软基体组织开始形成，而以撕裂方式终止于碳化物网壁处，因而其磨损机制为显微切削＋微观撕裂。据此，本文提出将撕裂形成功作为磨料磨损能量的第４分量的建议，对试验结果作出了合理的解释。

Abrasive wear of cermet coatings of chromium carbide formed by SHS technology is controlled by both a micro cutting procedure and a micro tearing one. Wear chip morphology has offered a powerful evidence to the mechanism. Based on it, a revision to the classical energy equation for abrasion was suggested.In the revised equation, tearing work was added as the fourth energy component. As a result, a rational explanation of the results can be obtained that under the same test condition, brittle materials behave as less wear loss, narrower groove width and less changed subsurface deformation compared with ductile materials.