In this study, cryptocrystalline graphite (CG) was investigated as a novel functional filler for acrylonitrile‐butadiene rubber (NBR)/carbon black (CB) composites. NBR/CB/CG composites are characterized by X‐ray diffraction (XRD), scanning electron microscope (SEM) as well as differential scanning calorimetry (DSC). The results showed that NBR/CB/CG‐10 increased by 18.2%, 11.0%, and 10.0% in tensile strength, 300% tensile modulus and tear strength, respectively compared with NBR/CB. Uniform filler dispersion and stronger interfacial interaction contributed to enhancing the mechanical property of NBR/CB/CG composites. It was revealed that the small particle size, rough surface, and defective structure of CG facilitated its exfoliation and intercalation. In addition, the tribological performance of NBR/CB/CG composites was tested on a ring‐on‐block wear tester under dry sliding conditions. The friction coefficient and specific wear rate of NBR/CB/CG‐5 reduced by 50.3% and 51.4%, respectively through the formation of fine lubrication and transfer films. CG enhanced the thermal stability, mechanical, and tribological performance of NBR composites simultaneously and the results of this work proved that CG would be a cost‐effective and resource‐available functional filler especially suitable for rubber seal application.

中文翻译：

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丙烯腈-丁二烯橡胶/炭黑/隐晶石墨复合材料的力学和摩擦学性能

在这项研究中，隐晶石墨（CG）被用作丙烯腈-丁二烯橡胶（NBR）/炭黑（CB）复合材料的新型功能性填料。NBR / CB / CG复合材料的特征在于X射线衍射（XRD），扫描电子显微镜（SEM）以及差示扫描量热法（DSC）。结果表明，与NBR / CB相比，NBR / CB / CG-10的抗张强度，抗张强度和撕裂强度分别提高了18.2％，11.0％和10.0％。均匀的填料分散和更强的界面相互作用有助于增强NBR / CB / CG复合材料的机械性能。揭示了CG的小粒径，粗糙的表面和结构缺陷有助于其剥落和嵌入。此外，NBR / CB / CG复合材料的摩擦学性能在干燥滑动条件下在环上磨损试验机上进行了测试。通过形成精细的润滑膜和转移膜，NBR / CB / CG-5的摩擦系数和比磨损率分别降低了50.3％和51.4％。CG同时提高了NBR复合材料的热稳定性，机械性能和摩擦学性能，这项工作的结果证明CG是一种经济高效且资源丰富的功能性填料，特别适合于橡胶密封应用。