ART对灰铸铁试样摩擦表面自修复的研究

A Study of the Effect of ART Reagent on Surface Modification and self-repairing of Cast Iron

运用改装的摩擦实验机对灰铸铁HT150—45钢摩擦副做旋转对磨实验,主要探索ART对灰铸铁摩擦副表面自修复改性的机理和耐磨规律。在摩擦副中加入ART试剂,在定载荷、定转速条件下在大气环境中进行试验。用Kevex能谱仪和S440扫描电镜等,通过测定试样的磨损率,表面显微硬度、粗糙度的测定和显微形貌的观察及表面成分分析与试样镜像组织观察,试验发现灰铸铁摩擦试样表面有一层光滑、平坦的乳白色膜生成,微观发现试样表面有大量灰色光滑块状物生成,表面微区亦增添了大量来自ART粉体中的元素,显微硬度明显提高,其中灰色区尤为显著,局部区域最高可达原来4倍;同时,表面粗糙度显著降低,有的试样Ra值为原来的14%,起到了良好的减摩耐磨效果。

The effects of organic silicate on the friction performance of HT150/45 steel pair are studied by using an improved friction apparatus. Emphases are mainly put on the mechanisms of surface self - repairing, modification and abrasion - resistant rule . The reagent of ART is added to the pair, and then the friction experiment is carried out under constant load, constant velocity in atmospheric environment. Restoration agent is analyzed by using kevex TEM, $440 SEM etc. The abrasion rate of cast iron is tested, meanwhile, by the test of sample surface microcosmic rigidity and the roughness, observation of the microcosmic appearance and the surface elements analysis and the observation of the metallographic phase organization, the results show that there is an ivory - white film on the surface of HT150. Investigation by microscope indicates that many grey blocks are observed on the specimen surface and some elements of ART are embedded into the surface. The micro - penetration hardness and surface roughness are greatly increased, which are four times as large as the original ones in some parts. At the same time, the surface roughness is obviously decreased, some sampleg Ro is 14% of the original one, which demonstrates the pronounced abrasion - resistant effects of organic silicate.