Structure and tribological behavior of a polyetherimide/polytetrafluoroethylene matrix filled with negative thermal expansion zirconium tungstate particles

IF 5.3 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear Pub Date : 2024-09-12 DOI:10.1016/j.wear.2024.205567

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引用次数: 0

Abstract

Thermal expansion mismatch stresses may be a reason for premature failure of sealing and bearing components made of polymer composites that are rubbed against metallic surfaces at elevated temperatures. It is of particular importance for polymer matrix composites loaded with anti-friction inclusions of polytetrafluoroethylene (PTFE) that possesses high coefficient of thermal expansion. In this regard, a study was undertaken to elucidate the effect of the thermal mismatch on wear and friction of amorphous polyetherimide (PEI) matrix loaded with either polytetrafluoroethylene (PTFE) particles (i) or PTFE particles covered with negative thermal expansion zirconium tungstate (ZT) α-ZrW₂O₈ (ii) at temperatures 23 °C, 120 °C and 180 °C. The ball-on-disk testing scheme was used according to standard with AISI 52100 steel balls rubbed against a polymer composite disks at normal force P = 5 N and sliding velocity V = 0.3 m/s. The PEI/PTFE/ZT composite demonstrated a tendency for wear rate (WR) reduction in sliding at 120 °C and 180 °C as compared to corresponding WR enhancement on the PEI/PTFE. The rationale is provided that the ZT additive effectively reduced thermal expansion of the PTFE in the PEI matrix and thus improved wear resistance of the composite. New thermal expansion-controlled wear and friction instability mechanism has been proposed and discussed.

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填充负热膨胀钨酸锆颗粒的聚醚酰亚胺/聚四氟乙烯基体的结构和摩擦学行为

热膨胀失配应力可能是聚合物复合材料制成的密封和轴承部件在高温下与金属表面摩擦而过早失效的原因。这对于装载了具有高热膨胀系数的聚四氟乙烯（PTFE）抗摩擦夹杂物的聚合物基复合材料尤为重要。为此，我们进行了一项研究，以阐明在 23 ℃、120 ℃ 和 180 ℃ 温度条件下，热失配对装有聚四氟乙烯（PTFE）颗粒（i）或覆盖有负热膨胀锆钨酸盐（ZT）α-ZrW2O8 的 PTFE 颗粒（ii）的无定形聚醚酰亚胺（PEI）基体的磨损和摩擦的影响。根据标准，采用球对盘测试方案，用 AISI 52100 钢球与聚合物复合盘摩擦，法向力 P = 5 N，滑动速度 V = 0.3 m/s。PEI/PTFE/ZT 复合材料在 120 °C 和 180 °C 时的滑动磨损率（WR）呈下降趋势，而 PEI/PTFE 的磨损率则相应提高。理由是 ZT 添加剂有效降低了 PEI 基体中 PTFE 的热膨胀，从而提高了复合材料的耐磨性。提出并讨论了新的热膨胀控制磨损和摩擦不稳定机制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Wear 工程技术-材料科学：综合

CiteScore

8.80

自引率

8.00%

发文量

280

审稿时长

47 days

期刊介绍： Wear journal is dedicated to the advancement of basic and applied knowledge concerning the nature of wear of materials. Broadly, topics of interest range from development of fundamental understanding of the mechanisms of wear to innovative solutions to practical engineering problems. Authors of experimental studies are expected to comment on the repeatability of the data, and whenever possible, conduct multiple measurements under similar testing conditions. Further, Wear embraces the highest standards of professional ethics, and the detection of matching content, either in written or graphical form, from other publications by the current authors or by others, may result in rejection.