磷含量对青铜基含油轴承力学性能与摩擦性能的影响

Effect of phosphorus content on the mechanical and friction properties of oil-impregnated bronze bearings

以青铜作为轴承基体,通过改变磷含量(0~1%,质量分数)和烧结温度,在一定转速和载荷下,测量轴承的摩擦系数和磨损量,并测定了轴承的开环强度,研究了磷含量对青铜基含油轴承的摩擦性能和力学性能的影响,获得一定工作条件下轴承配方和烧结工艺参数。结果表明:随着磷含量的增加,含油轴承的磨损量降低,力学性能提高,但磷含量过高时,轴承的含油率降低并低于轴承最低标准;随着烧结温度的增加,试样力学性能提高,但摩擦因数不稳定。当磷质量分数为0.7%、烧结温度为650℃时,含油轴承拥有良好的综合性能,开环强度和含油率分别为22 MPa和13.52%,摩擦因数稳定,呈最佳烧结状态。

Oil-impregnated bronze bearings with the different phosphorus contents(0~1%,mass fraction)were produced at the different sintering temperatures.To study the effect of P content on the friction and mechanical properties of the bearings,the friction coefficient and wear loss at the certain speed and load were measured,and the open-loop strength of bearings was examined.In addition,the optimized bearing content and sintering process parameters under the certain working conditions were obtained.The results show that,with the increase of P content,the wear loss of the bearings reduces,while the mechanical performances are improved.However,when the P content is excessed,the oil content reduces which is lower than the minimum standard.As the sintering temperature increases,the mechanical properties of the bearings are improved,but the friction coefficient is unstable.The open-loop strength and oil content of the oil-impregnated bronze bearing samples with 0.7%P content by mass after sintering at 650℃are 22 MPa and 13.52%,respectively,showing the good comprehensive performance as the stable friction factor and the best sintering state.