降低渗硼层本质脆性对其摩擦磨损特性的影响

以固体与分子经验电子理论（EET理论）为指导,采用MM—200型磨损试验机对比研究了称为渗硼层的Fe2B相和含铬Fe2B相的价电子结构以及它们的摩擦磨损特性。结果表明,与Fe2B相相比,含铬Fe2B相的价电子结构发生了变化,导致弱键B—B键的成键能力得以提高、渗硼层的本质脆性得以改善;渗硼层本质脆性的下降提高了它的承载能力和耐磨性,而且还具有一定的减摩作用。同时对磨损机理进行了分析讨论。

EFFECT ON DECREASING THE EIGEN-BRITTLENESS OF BORIDE LAYER ON ITS FRICTION AND WEAR BEHAVIOR

On the basis of Yu's empirical electron theory of solids and molecules, the valence electron structures of Fe2B phase and Cr-containing Fe2B phase (known as boride layers) are researched. At the same time, the effect on decreasing the eigen-brittleness of the boride layer, by pack RE-chrome-boronizing, on its friction and wear behavior is studied using an MM-200 wear tester. Compared with that of Fe2B phase, the valence electron structure of Cr-containing Fe2B phase has been changed, which results in the improvement of the eigen-brittleness of the boride layer and the enhancement of the weak bond B-B in the Fe2B phase. The drop of eigen-brittleness of boride layer can increase its load bearing capacity, wear resistance and friction-reducing. The friction and wear mechanism of the boride layers is too analyzed.