摘要
采用粉末冶金工艺制备基体致密、表层多孔含油的复层铁基含油材料,利用SEM、EDX和XRD分析材料微观组织形貌、组元和物相组成及断口形貌,并基于HDM-20端面摩擦磨损试验机评价其摩擦磨损性能.结果表明:在铁基粉末冶金材料中添加适量TiH2可有效提高材料的孔隙率,同时在孔隙附近内生TiC硬质相,有效弥补孔隙对力学性能削弱;添加TiH2后,材料的硬度提高,压溃强度有所降低,材料的断裂机理逐渐由韧性断裂转变为脆性断裂;随着TiH2含量增加,材料的摩擦学性能呈现先变好后恶化趋势,含质量分数3%TiH2材料的综合力学和摩擦学性能较好,能实现较高强度与良好自润滑特性的统一.研究工作为研制高性能铁基含油轴承材料提供新的思路.
The iron-based bearing materials with dense matrix and porous surface layer were made by powder metallurgy process.The microstructure and morphology were analyzed by scanning electron microscopy,energy dispersive spectroscopy and X-ray diffraction.The friction and wear properties of the composites were evaluated by an HDM-20 end-face friction tester.Results show that addtion of appropriate TiH2 effectively improved the porosity of the iron-based powder metallurgy materials.And TiC phase,endogenous near the pore,can effectively compensate the weakening due to the pores.The addition TiH2 increased the hardness but decreased the crushing strength.The fracture mechanism gradually changed from ductile fracture to brittle fracture.With the increase of TiH2 content,the tribological properties became better first and then worsen.The comprehensive mechanical and tribological properties of the materials containing 3%TiH2 were better,and the combination of high strength and good self-lubricating properties can be realized.This work provides a new idea for the development of high-performance iron-based oil bearing materials.
作者
张国涛
尹延国
李蓉蓉
童宝宏
刘聪
ZHANG Guotao;YIN Yanguo;LI Rongrong;TONG Baohong;LIU Cong(School of Mechanical Engineering,Anhui University of Technology,Anhui Ma’anshan 243002,China;Institute of Tribology,Hefei University of Technology,Anhui Hefei 230009,China)
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
2019年第5期619-627,共9页
Tribology
基金
国家自然科学基金项目(51575151,51975005)
安徽省自然科学基金项目(1908085QE195)资助~~
关键词
铁基含油轴承材料
粉末冶金
复层孔隙
力学性能
摩擦磨损
iron-based oil bearing materials
powder metallurgy
laminated pores
mechanical properties
friction and wear
