程先华
研究方向为表面工程及摩擦学,主要包括:纳米表面工程、材料的摩擦磨损、微机电系统(MEMS)中的摩擦学研究、材料表面界面特性研究、新型材料开发研制等。
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- 姓名:程先华
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学术头衔:
博士生导师, 教育部“新世纪优秀人才支持计划”入选者
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学科领域:
机械工程
- 研究兴趣:研究方向为表面工程及摩擦学,主要包括:纳米表面工程、材料的摩擦磨损、微机电系统(MEMS)中的摩擦学研究、材料表面界面特性研究、新型材料开发研制等。
程先华,男,43岁,工学博士,上海交通大学机械与动力工程学院教授,博士生导师,国家重点学科“机械设计及理论”学科负责人之一,工程摩擦学方向学术带头人,入选2001年度国家教育部跨世纪优秀人才培养计划。1982年哈工大金属材料及热处理专业本科毕业;1985年哈工大金属物理化学专业硕士毕业;1990年清华大学材料工程专业(摩擦学国家重点实验室)博士毕业。研究方向为表面工程及摩擦学,主要包括:纳米表面工程、材料的摩擦磨损、微机电系统(MEMS)中的摩擦学研究、材料表面界面特性研究、新型材料开发研制等。获得四项部级以上科研成果奖,其中一项为1999年度国家机械局科技进步二等奖(第一完成者),在SCI、EI收录期刊及一级学报上发表八十余篇论文,申请了十八项发明专利。
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16
程先华, CHENG Xian-hua, XUE Yu-jun
JOURNAL OF RARE EARTHS, 2001, 3 (19): 238-240,-0001,():
-1年11月30日
The friction and wear properties of metal-plastic multilayer composites filled with glass fiber, which is treated with rare earth element surface modifier, under impact load and dry friction conditions were investigated. Experimental results show that the metal-plastic multilayer composite filled with glass fiber exhibits excellent friction and impact wear properties when using rare earth elements as surface modifier for the surface treatment of glass fiber.
rare earths, metal-plastic multilayer composites, friction properties, impact wear properties
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程先华, J.WU, X.CHENG∗
,-0001,():
-1年11月30日
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程先华, Xue Yujun, Cheng Xianhua
JOURNAL OF RARE EARTHS, Vol. 21, No.3, Jun. 2003,-0001,():
-1年11月30日
e measured. The fracture surface morphologies were observed and analyzed by SEM. The results indicate that rare earth elements can effectively promote the interfacial adhesion between the glass fiber and PTFE, owing to the effects of rare earth elements on the compatibility. The tensile properties of GFPPTFE composites can be improved considerably when the content of RE in surface modifier is 0.2 %~014%, and the optimum performance of GFPPTFE composites is obtained at 0.3 %RE content.
GFPPTFE composites, tensile properties, rare earths
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程先华, J. Wu and X. H. Cheng
,-0001,():
-1年11月30日
Solutions of a rare-earth modifier (RES) and the epoxy chloropropane (ECP) grafting modification method are used for the surface treatment of F-12 aramid fibers. The effects of RES concentration on the interlaminar shear strength (ILSS) of F-12 aramid fiber/epoxy composites are investigated in detail, and the fracture surfaces of ILSS specimens are analyzed by SEM. It is shown that the RES surface treatment is superior to the ECP grafting treatment in promoting the interfacial adhesion between aramid fibers and the epoxy matrix. However, the tensile strength of single fibers is almost unaffected by the RES treatment. The optimum ILSS is obtained at a 0.5 wt.% content of rare-earth elements.
aramid fibers,, modification,, rare earths,, composites,, interlaminar shear strength
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程先华, Xianhua Chenga, *, Yujun Xuea, Chaoying Xieb
Materials Letters 57(2003)2553-2557,-0001,():
-1年11月30日
Polytetrafluoroethylene (PTFE) composites were prepared using 60 wt.% Pb and 5 wt.% glass fiber (GF). The surface of GF was modified with a coupling agent, a mixture of coupling agent and rare earths, and rare earths, respectively. The friction and wear properties of the PTFE composites, sliding against 45# carbon steel (AISI 1045 steel) under oil lubrication, were investigated on a pin-on-disc sliding wear machine. It was found that modified GF, which was filled into PTFE, decreased the wear of the PTFE composites compared with that of the PTFE composite filled with unmodified GF. The friction and wear properties of PTFE composite filled with Pb and rare earths-modified GF were greatly enhanced, owing to the effective improvement of the interfacial adhesion between the GF and PTFE.
Polytetrafluoroethylene, Composites, Lead, Glass fiber, Rare earths, Friction and wear properties
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【期刊论文】Tribological Properties of Rare Earth Self-assembled Nanometer Film*
程先华, SHANGGUAN Qian-qian, ), CHEN Xian-hua), XIE Chao-ying)
Journal of Wuhan University of Technology-Mater. Sci. Ed. 2004, 19, 25~26,-0001,():
-1年11月30日
Self-assembled film containing the rare earth (RE) elements was formed on a silicon dioxide substrate, in order to reduce the surface adhesion and the f riction force of micro electro-mechanical systems (MEMS). The film thickness was measured as 2nm. The tribological experiment result shows that the friction coefficient of SiO2 substrate reduces from 0.5 to 0.1 after the formation of RE self-assembled film on its surface. Besides, RE self-assembled film exhibits a high wear resistant ance.
rare earth, self-assembled film, tribology, MEMS
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【期刊论文】Tensile properties of glass fiber reinforced PTFE using a rare-earth surface modifier
程先华, YUJUN XUE, XIANHUA CHENG∗
,-0001,():
-1年11月30日
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程先华, Yu-Jun Xue, Xian-Hua Cheng
Journal of Applied Polymer Science, Vol. 86, 1667-1672(2002),-0001,():
-1年11月30日
Three types of surface modifiers, N-β-aminoethyl-y[1]-aminopropyltrimethoxysilane coupling agent (SGS), a mixture of silane and rare earth elements (SGS/RES), and rare earth elements surface modifier (RES), were used to treat the glass fiber surface. Tensile tests of glass fiber–reinforced polytetrafluoroethylene (GF/PTFE) composites with different surface treatment conditions, surface modifiers, and glass fiber content were carried out. Finally, the fracture surface morphologies of GF/PTFE composites were investigated using scanning electron microscopy. Experimental results showthat the tensile properties of the treated GF/PTFE composite increased compared with those of the untreated one. RES is superior to SGS/RES and SGS modifiers in promoting interfacial adhesion between the glass fiber and PTFE because of the effects of rare earth elements on the compatibility. Meanwhile, the optimum contents of rare earth elements for the improvement of the tensile properties of GF/PTFE composite were obtained for RES and SGS/RES modifiers. The interfacial adhesion of the GF/ PTFE composites treated with RES or SGS/RES modifiers was mainly controlled by the contents of rare earth elements. The tensile properties of the GF/PTFE composites improved considerably when the content of rare earth elements in surface modifiers was 0.2-0.4wt%, and the optimumtensile performance of GF/PTFE composites was obtained at 0.3wt% RE content.
polytetrafluoroethylene, composites, interfaces, adhesion, mechanical properties
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程先华, Shangguan Qianqian, , Cheng Xianhua, *
OURNAL OF RARE EARTHS, Vol. 22, No.3, Jun. 2004, 406~409,-0001,():
-1年11月30日
Effect of rare earth elements (RE) on erosion resistance of nitrocarburized layer of 38CrMoAl steel was investigated. The results indicate that significant improvement occurs in erosion resistance of nitrocarburized 38CrMoAl steel by introducing RE during nitrocarburizing processing as compared with conventional nitrocarburizing processing. Results of mechanical testing show that both hardness and impact toughness of RE-nitrocarburizing layer of 38CrMoAl steel increase as compared with the conventional one. Optical microscopy reveals that there is improvement in the nitrocarburized layer attributed to the introduction of RE, which results in improvement in erosion resistance. Surface morphology observation of tested samples reveals that predominantly furrow2like peelings from plastic deformation are observed for RE nitrocarburizied 38CrMoAl steel, while the furrow-like peeling with initial cross crack and large grinding peelings were observed for conventionally nitrocarburized samples.
metal materials, rare earth elements, nitrocarburizing, erosion resistance, impact toughness, are earths
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【期刊论文】Effect of rare earth elements on the erosion resistance of nitrided 40Cr steel
程先华, Xian-Hua Chenga, ∗, Chao-Ying Xieb
Wear 254(2003)415-420,-0001,():
-1年11月30日
An investigation of the effect of rare earth elements (RE) on erosion resistance of nitrided 40Cr steel is carried out using an erosion test rig in a water-based slurry with quartz particles. Results indicate that a significant improvement occurs in erosion resistance of nitrided 40Cr steel by introducing RE in nitriding processes comparing conventional nitriding processes. Measurement of physical properties exhibits that both hardness and toughness of nitrided 40Cr steel increase in the case using RE-nitriding processes comparing the conventional. Metallurgical microscopy reveals that there is a transformation from a coarse to a fine metallurgical microstructure in the case and an increase in the thickness of white layer on the top of case attributed to an introduction of RE in nitriding, which attributed to an improvement in erosion resistance and physical properties. EDX analysis shows that RE diffuse into the case of 40Cr steel in nitriding process as a result of appearance of micro-alloy. Microscopy revealed that the furrow-like peeling from plastic deformation of material is predominant erosion mechanism of RE nitrided 40Cr steel while the furrow-like peeling with initial cross crack and large grinding peelings takes place predominantly in tests of conventionally-nitrided ones, which results in a significant difference in erosion resistance.
Rare earth elements, Nitriding, Microstructure, Toughness, Erosion resistance, Wear mechanism
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