复合型稀土添加剂对刚玉系高温自润滑材料组织结构与性能的影响

Effect of Rear-Earth Oxide Composite Additives on the Microstructure and Properties of Al_2O_3-Based Self-Lubricating Materials

借助于XRD、SEM、AFM等的测试结果,系统的研究了稀土氧化物添加剂对刚玉系高温自润滑材料组织结构与性能的影响。结果表明:复合型稀土添加剂可改善和优化其组织结构,起到细化晶粒,促进致密化作用,可有效地提高材料高温摩擦状态下的强度、韧性和蠕变能力,促进表层结构的有利转变,形成纳米结构层,出现流体动力润滑,使摩擦磨损进一步降低,呈现出良好的高温自润滑性能。

The effects of rare--earth oxide additives on the microstructure and properties of A12 O3 --based self--lubricating materials were systematically studied by means of XRD,SEM and AFM. The experimental results indicate that rare--earth oxide composite ad- ditives can modify the materials microstructure, reduce the crystal size and make the body more compact, effectively improve the inten- sity,toughness and creep resistance under frication condition at high temperature, and it can promote the transformation of surface structure to nanophase--structural layer, exhibit hydrodynamic lubrication so that friction and wear behaviors decreased obviously and the materials possess favorable self--lubricating properties at high temperature.