改性PBT复合材料在水润滑条件下的摩擦学性能研究

Tribological Properties of Modified PBT Composite Materials under Water Lubricated Condition

通过熔融共混法制备聚四氟乙烯(PTFE)/聚对苯二甲酸丁二醇酯(PBT)、硅灰石/PBT复合材料及芳纶质量分数为5%和10%的芳纶/PBT复合材料,对比分析4种改性PBT复合材料在水润滑条件下的摩擦磨损性能。结果表明:在中低速下,4种复合材料摩擦因数比较稳定,高速条件下,PTFE/PBT、硅灰石/PBT复合材料的摩擦因数逐渐上升,芳纶/PBT复合材料摩擦因数逐渐减小,其中芳纶质量分数为5%的改性PBT复合材料在试验时间内平均摩擦因数最小,摩擦因数稳定性最高;芳纶/PBT复合材料在试验时间内的磨损量明显小于PTFE/PBT及硅灰石/PBT复合材料,其中芳纶质量分数为5%的芳纶/PBT复合材料的磨损量最小;芳纶/PBT复合材料磨损机制主要为轻微的疲劳磨损,PTFE/PBT复合材料主要为黏着磨损,并伴随轻微的疲劳磨损,硅灰石/PBT复合材料以磨粒磨损为主。

Four polybutylene terephthalate （PBT） composite materials, Which were modified ：by PTFE, wollastonite, and Kevlar fibers with mass fractions of 5% and 10% respectively, were prepared by melt,blending method. The tribological properties of the modified PBT composite mater, s were analyzed under water lubncated condition.The results show that the prepared PBT composite materials have relatively stable friction coefficient under the medium and low speed.But under the high speed, the friction coefficients of PTFE/PBT and wollastonite/PBT composite materials are increased gradually, while that of Kevlar/PBT composite materials are decreased gradually.Among them, Kevlar/PBT composite materials with a mass fraction of 5% aramid fiber have the smallest average friction coefficient and the highest stability of friction coefficient within the test time.The wear losses of Kevlar/PBT composite materials are significantly smaller than that of PTFE/PBT and wollastonite/PBT composite materials during the test time, and the Kevlar/PBT composite materials With a mass fraction of 5% aramid fiber have the smallest wear loss.The wear mechanism of the Kevlar/PBT composite materials is mainly fatigue wear, PTFE/PBT composite materials are mainly adhesive wear accompanied by a slight fatigue wear, wollastonite/ PBT composite materials are mainly abrasive wear.