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WS2 of 96 and 205 nm-thick were prepared and the tribological properties of resin-based carbon composites (RCCs) reinforced by WS2 were investigated. The wear rate of the RCCs reinforced with 205 nm-thick WS2 (205-WS2-RCC) was reduced by 36.3% compared with 96-WS2-RCC. Both 205-WS2 and graphite were detected and tightly integrated on the tribo-films formed on the worn surface of 205-WS2-RCC, while 96-WS2 was heavily oxidized. Industrial tests also showed that the wear rate of 205-WS2-CRCC is 21% lower than that of 96-WS2-CRCC. Molecular dynamics simulations showed that the interlayer association energy decreased with the increment of layer numbers (thickness) of WS2, indicating that thicker WS2 is beneficial to achieve the interlayer dissociation to integrate with graphite for forming tribo-films. [ABSTRACT FROM AUTHOR]

The self-sintering of green petroleum coke (GPC) is an important method for the synthesis of high-strength graphite blocks owing to its relatively short production cycle. However, the volatilization of small molecular components in GPC inevitably results in the generation of pores and microcracks which seriously deteriorates the mechanical performance of carbon blocks. Herein, we report a facile quinoline-assisted composition regulation approach to prepare high mechanical strength carbon blocks using GPC as the starting material. Quinoline exhibits three major functions. Firstly, unideal organic volatiles can be effectively removed via quinoline extraction, thereby inhibiting the generation of pores and microcracks. Secondly, the presence of quinoline can promote the polymerization of aryl compounds due to its easy formation of free radicals. Thirdly, the interactions between the graphite layers are enhanced by the polarization of the aromatic rings, which clearly improves the mechanical performance of the carbon blocks. As a result, the obtained carbon block GPC/QI-17-C demonstrates an apparent density of 1.56 g·cm−3, flexural strength of 39.61 MPa and compressive strength of 136.98 MPa, which are 1.16, 3.39 and 4.53 times that of pristine GPC counterparts, respectively. [Display omitted] • A facile quinoline-assisted GPC composition regulation approach is firstly reported to prepare high performance carbon blocks. • Quinoline has 3 major roles, i.e. removing unideal volatiles, promoting aryls polymerization and enhancing polar interaction. • The main chemical components of GPC and their contributions in carbonization process, is systematically investigated. [ABSTRACT FROM AUTHOR]