PEEK/ZA8复合材料的制备及力学与摩擦学性能研究

Preparation and Mechanical and Tribological Properties of PEEK/ZA8 Composites

采用模压成型法制备了锌铝合金(ZA8)填充聚醚醚酮(PEEK)复合材料,研究了ZA8含量和固体添加剂石墨和聚四氟乙烯(PTFE)对复合材料力学和摩擦学性能的影响。结果表明,复合材料的力学性能随着ZA8含量的增加呈先增加后降低的趋势,冲击强度和拉伸强度在ZA8含量为10%(质量分数,下同)时最大,分别为16.21 kJ/m^2和111.59 MPa,与纯PEEK相比分别增加了10.3%和3.9%;复合材料的摩擦因数随ZA8含量的增加呈持续下降的趋势,在ZA8含量为40%时最低为0.275,与纯PEEK相比降低了38.6%;磨损量呈先减小后增大的趋势,在ZA8含量为10%时最低为7.2 mg,比纯PEEK减小了43.3%;石墨和PTFE的添加能有效减小PEEK/ZA8复合材料的磨损量,其中加入10%的PTFE(未添加石墨)所制得的复合材料的摩擦学性能最好,摩擦因数为0.22、磨损量为4.3 mg,与纯PEEK相比分别降低了50.9%和66.1%。

The zinc aluminum alloy(ZA8)-filled PEEK composites were prepared by a compression molding method,and the effects of ZA8 content and the solid additives of graphite and polytetrafluoroethylene(PTFE)on their mechanical and tribological properties were investigated.The results indicated that the mechanical properties of the composites increased at first and then tended to decrease with an increase of ZA8 content.The composites achieved the maximum impact strength of 16.21 kJ/m^2 and the tensile strength of 111.59 MPa at the ZA8 content of 10 wt%,which increased by10.3%and 3.9%,respectively,compared to pure PEEK.Their friction coefficients exhibited a continuous decrease with an increase of ZA8 content and presented the minimum value of 0.275 at the ZA8 content of 40 wt%,which decreased by 38.6%compared to pure PEEK.Moreover,the friction coefficient decreased by 38.6%when 10 wt%of ZA8 content was incorporated into PEEK.At this content,the composites obtained the lowest abrasion loss of 7.2 mg,which was 43.3%lower than that of pure PEEK.The addition of graphite and PTFE effectively reduced the abrasion loss of the composite.The optimum tribological properties were achieved by the addition of 10 wt%PTFE alone,and the composites gained a friction coefficient of 0.22 and an abrasion loss of 4.3 mg,which were 50.9%and 66.1%lower than those of pure PEEK,respectively.