The tribological response of PTFE-based composites for mechanical seals can be significantly affected by the nature of the counterface. In this work, glass fibre (GF) and carbon fibre (CF) reinforced PTFE-matrix composites were slid, in a pin-on-disc configuration, against AISI 304 stainless steel, either uncoated or coated with plasma sprayed Cr₂O₃.

When mated with uncoated steel, GF-PTFE composites tended to wear down more, but also produced a thicker and more continuous tribofilm than did CF-PTFE ones. The pulverized glass debris adsorbed humidity and formed a cohesive “skeleton” to keep the PTFE debris in place, thus resulting in comparatively lower friction coefficients of ≈0.20–0.27.

On the other hand, the polished Cr₂O₃ surface, with smooth plateaus and numerous valleys of various sizes, facilitated the retention of transfer material. Therefore, it produced less friction than uncoated steel, both against GF-PTFE and CF-PTFE, although the CF-PTFE pin showed a limited capacity to develop a tribofilm. CF-PTFE, however, suffered more severe wear than did GF-PTFE against Cr₂O₃, because the carbon fibres fractured more frequently.

The bulk temperature of the composites never increased by more than 12 °C during the tests, and the rise in temperature depended more on the friction coefficient than on the thermal conductivity and diffusivity of the mated surfaces.

用于机械密封的 PTFE 基复合材料的摩擦学响应会受到接触面性质的显着影响。在这项工作中，玻璃纤维 (GF) 和碳纤维 (CF) 增强的 PTFE 基复合材料以销钉盘式配置与 AISI 304 不锈钢滑动，未涂覆或涂覆有等离子喷涂的 Cr ₂ O ₃。

当与无涂层钢配合时，GF-PTFE 复合材料往往磨损得更多，但也比 CF-PTFE 复合材料产生更厚、更连续的摩擦膜。粉碎的玻璃碎片吸附湿气并形成一个有凝聚力的“骨架”，将 PTFE 碎片固定在适当的位置，从而导致相对较低的摩擦系数约为 0.20-0.27。

另一方面，抛光的 Cr ₂ O ₃表面具有光滑的平台和众多大小不一的山谷，有利于转移材料的保留。因此，它对 GF-PTFE 和 CF-PTFE 的摩擦都比无涂层钢产生的摩擦小，尽管 CF-PTFE 销显示出形成摩擦膜的能力有限。然而，CF-PTFE 比 GF-PTFE 对 Cr ₂ O _{3 的}磨损更严重，因为碳纤维断裂更频繁。

在测试过程中，复合材料的整体温度从未升高超过 12 °C，并且温度升高更多地取决于摩擦系数，而不是配合表面的热导率和扩散率。