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      저자 : Yuehu Chen (검색결과 2 건)
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        Study on the lubrication film formation and characteristics of different graphite seal composites

        Qili Wang,Jiarui Sun,Mingquan Yu,Yuehu Chen 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.8

        In order to study the formation and characteristics of the lubricating film of graphite composites in solid lubrication, the mechanical properties, micro-structure, friction and wear properties of graphite and impregnated samples are compared and analysed. Results show that the graphite/antimony composites have compression strength of 300.2 MPa and hardness of 98.3 HS, which has excellent friction performance and exhibits the law of full film lubrication. The graphite/resin composites with compression strength of 244.9 MPa and hardness of 87.0 HS exhibit the law of residual film lubrication. Under the condition that the load is 24.1 MPa (heavy load) and the friction pair is 45# (small hardness), the lubrication state of the composite materials are close to full film lubrication. External environmental factors such as load, speed, and pair of grinding pairs have different effects on the friction coefficient and the formation of lubricating film.

      • KCI등재

        Efficient removal of Cr(VI) by spent coffee grounds: Molecular adsorption and reduction mechanism

        Yue Hu,Meiting Zhi,Shilin Chen,Wenguan Lu,Yinlong Lai,Xiaobing Wang 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.7

        Spent coffee ground (SCG), a byproduct from the soluble coffee industry, is usually discarded as waste. Thereutilization of SCG for the removal of toxic heavy metal ions is a novel research direction. Until recently, the molecularadsorption and reduction mechanism of Cr(VI) on SCG was barely investigated. In this study, SCG was used forthe efficient removal of Cr(VI) at a concentration range of 2-100mg/L, with a maximum Cr(VI) uptake up to 36.2mg/g. Structural characterization and ATR-FTIR analysis indicated that SCG possessed abundant surface O and N- containingfunctional groups. The corresponding adsorption and reduction effects on the Cr(VI) removal were investigatedby the carboxyl and hydroxyl groups elimination experiments and ATR-FTIR characterization, respectively. Theresults revealed that HCrO4 ions were preliminarily adsorbed on SCG surfaced-COOH/-OH/-NH by the formation ofhydrogen bond (SCG surfaced-COOH/-OH/-NH···HCrO4), and quickly reduced to Cr(III) by the electron denoted byphenolic compounds, and then in-situ immobilized on the surface of SCG. The effect of Cr(VI) concentration, coexistingions, and humic acid was systematically studied to optimize the removal of Cr(VI) wastewater. Column experimentsprovided a new substitution to restore the Cr(VI)-containing groundwater for the permeable reactive barrierapplication. Thus, the proposed study uncovered the intrinsic Cr(VI) removal mechanism at the molecular level andexplored the application of SCG for the efficient removal of Cr(VI).

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