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- 저자 : Pingping Gao (검색결과 2 건)
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Study on Metallurgically Prepared Copper-Coated Carbon Fibers Reinforced Aluminum Matrix Composites
Meilian Gao,Pingping Gao,Yu Wang,Yu Wang,Ting Lei,Chun Ouyang 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12
Carbon materials, like carbon fiber, carbon nanotubes and graphene, were widely used as promising reinforcements tostrengthen aluminum matrix composites (AMCs). The dispersion of reinforcement in matrix and interface wettability betweenmatrix and reinforcing phase have been key factors affecting AMCs properties. In this study, electroless copper-coatedcarbon fibers reinforced aluminum (Cu-Cf/Al) composites were prepared by spark plasma sintering processing followedby heat treatment. Microstructure and mechanical properties were investigated. Microstructure observation indicated thatfibers distributed uniformly in the composites containing up to 9 wt% copper-coated carbon fibers (Cu-Cf). In addition, aninterfacial layer of 50 nm thickness was formed between the fiber and Al matrix due to mutual diffusion of Cu and Al atoms. Vickers hardness, tensile strength and bending strength of 9 wt% Cu-Cf/Al composite increased from 40 to 93 HV, 59 to190 MPa and 110 to 326 MPa, respectively, compared to Al matrix. The improved mechanical properties are ascribed to thesynergistic effect of dispersion, precipitation and solution strengthening. However, the elongation of composite decreased ascompared to that of Al matrix. Moreover, Cu-Cf/Al composite exhibits superior corrosion resistance over uncoated carbonfiber/Al composite but less than Al matrix.
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Qinju Sun,Shaohua Lin,Guohua Liu,Yue Xuan,Liping Gao,Pingping Li 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.5
A new amine group functionalized moso bamboo powder adsorbent (AMBP) was prepared using a facile procedure to remove Cd(II) complexes with citric acid (CA) and tartrate acid (TA). The properties of the AMBP were characterized using SEM, FTIR, XPS, BET, and an elemental analysis. The adsorptive performances of the AMBP toward Cd(II)-CA/TA were investigated. The results indicated that amine group was successfully introduced, and the AMBP with a BET specific surface area of 0.463 ㎡/g was effective in adsorbing Cd(II)-CA/TA under pH 4.0–10.0. The removal of Cd(II) increased significantly when the Cd(II)/ligand molar ratio changed from 1:0.5 to 1:2. The adsorption processes of Cd(II)-CA/TA were endothermic and fit well with the pseudo-second-order kinetic model (R² > 0.999). The Langmuir model (qmax of 14.41 and 7.58 mg/g for Cd(II)-CA and Cd(II)-TA, respectively) fit the isotherms better than the Freundlich model. The AMBP could be regenerated by HCl and reused at least 4 times. The uptake mechanisms of Cd(II)-CA/TA were proposed to be physisorption and the chemisorption of the coordination between –NH₂/–NH and the Cd(II). This work shows that the AMBP is an adsorbent with high practical value to remove Cd(II) in water or wastewater containing CA/TA.
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