高强度镶嵌自润滑材料的设计及摩擦实验

铜基镶嵌型自润滑轴承的承栽压强大约为50MPa，难以满足重型工程机械对自润滑轴承的要求。本项研究利用赫兹接触理论及摩擦的粘着理论，导出了摩擦因数随栽荷变化的定量关系，提出了以轴承钢代替传统镶嵌型复合材料的铜合金的设计方案，研制出新型轴承钢／聚四氟乙烯镶嵌型复合材料。摩擦实验结果表明，这种新型复合材料的承栽压强可达到90MPa，摩擦因数低于0．15，能够满足苛刻工况条件下工程机械对重栽自润滑轴承的要求。

Design and Tribological Experiment of Steel-Based Inserted Self-Lubricating Composites Under Heavy Loading Conditions

The brass-based inserted self-lubricating composite is difficult to meet the requirements for self-lubricating bearings of heavy engineering machines due to its maximum loading capacity of about 50 MPa. In the present research, the quantitative expression between friction coefficient and load-carrying capacity is derived by using Hertz theory and classical theory of adhesion. A new GCr15 steel / PTFE inserted composite is developed by using GCr15 steel as the backing of the new composite instead of that of conventional brass. Experimental results show that the new composite against a mating 40Cr steel shaft exhibits the heavy loading capacity of 90 MPa, and low friction coefficient is less than 0.15 under dry sliding conditions. So the new composite can meet the requirements for self-lubricating bearings of engineering machines under severe load conditions.