孔隙结构对铁基含油滑动轴承材料摩擦学性能的影响  

Effects of Pore Structure on Tribological Properties of Iron-Based Oil-Containing Plain Bearing Materials

作　　者：李蓉蓉 尹延国[1] 苗继琳 方小亮 LI Rongrong;YIN Yanguo;MIAO Jilin;FANG Xiaoliang(Institute of Tribology,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学摩擦学研究所,合肥230009

出　　处：《轴承》2024年第5期78-83,共6页Bearing

基　　金：国家自然科学基金面上项目(51575151)。

摘　　要：分别将TiH2和聚酰胺-66短纤维作为高温和低温分解造孔剂,通过粉末冶金方法制备了铁基含油滑动轴承材料。TiH2分解产生的H2从材料中逸出,在基体内留下大孔洞,嵌入基体的聚酰胺-66短纤维低温分解后可在基体中生成连通的纤维状孔隙通道,有助于基体储存与释放润滑油。研究了造孔剂对铁基含油滑动轴承材料性能的影响,结果表明:有造孔剂的基体含油率比无造孔剂的基体含油率提高了33.9%,在摩擦热的作用下,可以将润滑油迅速释放到含油材料表面,与对偶件之间形成一个稳定的固-液-固界面,从而减少材料的摩擦磨损;当载荷为300 N(接触压强为1.2 MPa)时,含油材料的摩擦系数为0.078;适当增加载荷,有利于润滑油的释放;当载荷较大时,润滑油膜易被压溃破损,材料减摩性能变差。The iron-based oil-containing plain bearing materials are prepared by powder metallurgy using TiH2 and polyamide 66 short fibers as pore forming agents under high and low temperature respectively.H2 generated by decomposition of TiH2 escapes from the materials,leaving large pores in matrix.The polyamide 66 short fibers embedded in matrix could be decomposed under low temperature to form interconnected fiber-like pore channels in matrix,helping the matrix to store and release lubricating oil.The effect of pore forming agents on properties of the materials is studied.The results show that the oil content of matrix with pore forming agent is 33.9%higher than that of matrix without pore forming agent.Under the action of friction heat,the lubricating oil can be quickly released to surface of oil-containing materials,and a stable solid-liquid-solid interface is formed between counterparts,thus reducing the friction and wear of the materials;when the load is 300 N(contact pressure is 1.2 MPa),the friction coefficient of the materials is 0.078;appropriate increase in load is conducive to release of lubricating oil;when the load is large,the lubricating oil film is easy to be crushed and broken,and the antifriction performance of the materials deteriorates.

关 键 词：滑动轴承 多孔材料 聚酰胺-66 自润滑轴承材料 摩擦系数 含油率 

分 类 号：TH133.31[机械工程—机械制造及自动化] TH117.2