Polytetrafluoroethylene (PTFE) blended with polyimide (PI) and filled with boron nitride (BN) is prepared through cold pressing and sintering for composites with remarkable wear resistance and reduced coefficient of friction (COF). The characterizations show that BN and PI at different levels, improve the hardness, dynamic thermo-mechanical modulus, thermal conductivity, and tribological properties of PTFE. PI boosts the dispersion and bonding of BN in PTFE. In dry sliding friction of a block-on-ring tribometer, the wear rate and COF of 10:10:80 BN/PI/PTFE reduce to almost 1/300 and 80% of those of pure PTFE, respectively, as the wear mechanism transition from being adhesive to partially abrasive. This occurs only when the additives BN and PI induce a synergistic effect, that is, at concentrations that are not higher than ca. 10 wt% and 15 wt%, respectively. The obvious agglomeration at high percentages of added PI and severe conditions (400 N and 400 rpm) induce strong adhesive failure. The variations in the tensile properties, hardness, crystallization, and microstructure of the composites correspond to different effects. The multiple parameters of the plots of wear and friction are transformed into their contour curves. The mechanism transition maps aid in understanding the influence of various test conditions and composite compositions on the contact surfaces in the space-time framework of wear.

聚四氟乙烯（PTFE）与聚酰亚胺（PI）共混并填充氮化硼（BN），通过冷压和烧结制备具有显着耐磨性和降低摩擦系数（COF）的复合材料。表征表明，不同水平的 BN 和 PI 提高了 PTFE 的硬度、动态热机械模量、热导率和摩擦学性能。PI 促进了 BN 在 PTFE 中的分散和粘合。在块环摩擦计的干滑动摩擦中，10:10:80 BN/PI/PTFE 的磨损率和 COF 分别降低到纯 PTFE 的近 1/300 和 80%，作为磨损机制从粘性过渡到部分磨蚀。这仅在添加剂 BN 和 PI 引起协同效应时发生，即浓度不高于约 分别为 10 重量％和 15 重量％。在高百分比添加 PI 和严酷条件（400 N 和 400 rpm）下明显的团聚会导致强烈的粘合失效。复合材料的拉伸性能、硬度、结晶和微观结构的变化对应于不同的效果。磨损和摩擦图的多个参数被转换成它们的轮廓曲线。机理转换图有助于了解各种测试条件和复合材料成分对磨损时空框架中接触表面的影响。