項目詳細信息 Detalhes de Projeto

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de Projeto

005/2008/A1 澳門大學郭志達鐵路系統的銅基電接觸材料的激光表面

處理

項目摘要

Due to its relatively low cost, excellent electrical and thermal conductivities,

copper is often used as the overhead contact wires for electric railway

systems. However, the low wear resistance attributable to its low hardness

greatly affects its application and service lifespan. In recent years, laser

remanufacturing has been extensively used for surface treating engineering

components with the merits of refined microstructure, strong metallurgical

bond, low dilution ratio, minimum distortion and high processing speed. It

brings great economic & social benefits including lower energy consumption,

reduction of pollution, saving precious materials and high value added to the

components. In order to enhance the wear resistance and hence the lifespan of

copper, surface modification employing various metals such as Cr, Ni, W, Ti

and Al on pure copper was attempted using laser surface modification with a

2.5 kW CW Nd:YAG laser. The microstructure, hardness, electromechanical

wear and corrosion resistance and interfacial contact resistance (ICR) of the

laser-surface modified copper were compared with those of cold-drawn pure

copper. The hardness of the laser-surface modified samples has increased to

at most 7.5 times. All the laser-surface modified samples have ICR values

close to that of the cold-drawn copper, except for laser-alloyed sample with

W. Among all specimens, the laser-surface modified sample with Ti shows

the most significant improvement in both electromechanical wear and

corrosion resistance while the electrical conductivity can be preserved.

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International Journal Paper Effect of pH on Corrosion Behavior of CuCrZr in Solution without and with NaCl

C.T. Kwok (PI) P.K. Wong (PhD student)

C.T. Kwok, P.K. Wong, H.C. Man, F.T. Cheng, ‘Effect of pH on Corrosion Behavior of CuCrZr in Solution without and with NaCl’, Journal of Nuclear Materials, Vol. 394 (2009) 52-62.

Published (SCI)

International Journal Paper

Sliding Wear and Corrosion Resistance of Copper-based Overhead Catenary for Traction Systems C.T. Kwok (PI) P.K. Wong (PhD student)

C.T. Kwok, P.K. Wong, H.C. Man, F.T. Cheng, ‘Sliding Wear and Corrosion Resistance of

Copper-based Overhead Catenary for Traction Systems’, to be appeared in International Journal of Railway (ISSN 1976-9067), No. 2, Vol. 3 (December) 2009. Published International Journal Paper Laser Surface Alloying of Various Engineering Alloys for Sliding Wear and Corrosion Resistance C.T. Kwok (PI) P.K. Wong (PhD student)

C.T. Kwok, P.K. Wong, “Laser Surface Alloying of Various

Engineering Alloys for Sliding Wear and Corrosion Resistance”,

submitted to Journal of Laser Micro / Nanoengineering (ISSN 1880-0688) in 2009. Published (SCI) International Conference Paper Sliding Wear of Copper-based Overhead Contact Wires for Electric Railway System

C.T. Kwok (PI) P.K. Wong (PhD student)

P.K. Wong, C.T. Kwok, H.C. Man, F.T. Cheng, “Sliding Wear of Copper-based Overhead Contact Wires for Electric Railway System”, The International Symposium on Speed-up, Safety, and Service Technology for Railway and Maglev System, June 16 –19, 2009, Niigata, Japan, paper no. 359829.

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International Conference Paper Applications of Laser Remanufacturing for Wear and Corrosion Resistance C.T. Kwok (PI) P.K. Wong (PhD student)

P.K Wong, W.K. Chan, C.T. Kwok, K.H. Lo, ‘Applications of Laser Remanufacturing for Wear and Corrosion Resistance’, 6th International Symposium on Environmentally Conscious Design and Inverse Manufacturing

(EcoDesign 2009), December 7-9, 2009, Sapporo, Japan. Published (SCI) National Conference Paper Electrical Sliding Wear and Corrosion Behavior of Contact Line Materials For Electric Traction Systems C.T. Kwok (PI) P.K. Wong (PhD student)

P.K. Wong, C.T. Kwok, “Electrical Sliding Wear and Corrosion Behavior of Contact Line Materials For Electric Traction Systems”, 1st Nanshan District Academic Forum of PhD Candidates' from Shenzhen, Hong Kong, Macao and Taiwan, 196th PhD Candidates' Academic Forum, November 18-19, 2008, Shenzhen, China (CD-ROM paper).

Published National Conference Paper Enhancement in Wear Resistance of Copper Contact Wire by Laser Surface Treatment for Electric Railway Systems P.K. Wong (PhD student) C.M. Tou* W.S. Kam* C. T. Kwok (PI)

P.K. Wong, C.M. Tou, W.S. Kam, C. T. Kwok , ‘Enhancement in Wear Resistance of Copper Contact Wire by Laser Surface Treatment for Electric Railway Systems’, Proceedings of the 8th Engineers Forum of Guangdong, Hongkong, Macau, Fujian and Taiwan (2010 GHMT), Xiamen, November, 19-20, 2010 (CD-ROM paper).

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National Conference Paper Study on a Wear Resistant Overhead Contact Line Material for Electric Railway Systems C.M. Tou* W.S. Kam* P.K. Wong (PhD student) C. T. Kwok (PI)

C.M. Tou, W.S. Kam, P.K. Wong, C.T. Kwok , ‘Study on a Wear Resistant Overhead Contact Line Material for Electric Railway Systems’, Proceedings of the 8th Engineers Forum of Guangdong, Hongkong, Macau, Fujian and Taiwan (2010 GHMT), Xiamen, November, 19-20, 2010 (CD-ROM paper). Published National Conference Paper A Study on Arc Erosion and Corrosion of Laser-alloyed Copper for Electric Railway Systems P.K. Wong (PhD student) W.S. Kam* C.M. Tou* C. T. Kwok (PI)

P.K. Wong, W.S. Kam, C.M. Tou, C.T. Kwok , ‘A Study on Arc Erosion and Corrosion of Laser-alloyed Copper for Electric Railway Systems’, The 5th Symposium on Sustainable

Development –Cooperation Among Hong Kong, Macau and

Guangdong, Hong Kong, Macau and Guangdong, September 27-30, 2010, pp. 437-441. Published International Conference Paper A Study on Arc Erosion and Corrosion of Laser-alloyed Copper for Electric Railway Systems C. T. Kwok (PI) P.K. Wong (PhD student) C.T. Kwok , P.K. Wong, W. K. Chan, F.T. Cheng, H.C. Man, ‘Laser Surface Alloying of Mn-Ni-Al Bronze for Cavitation Erosion Resistance’, Proceedings of the 29th International Congress on Applications of Lasers &

Electro-Optics 2010 (ICALEO '10), Miami, USA, September 27-30, 2010, (CD-ROM paper no. 1105).

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BSc Final Project Report Studying of High-speed Electrical Sliding Wear of Copper Alloys by a Tribometer Tou Chin Meng, Vong Antonio, Kam Weng Seng (undergraduate students)

Sliding Wear Behavior of

Copper-based Alloys for Electrical Contacts (2007/08) Report submitted to FST/UM BSc Final Project Report Design of a Tribometer for Studying High-Speed Electrical Sliding Wear of Contact Line Materials Ng Sin Man, Wong Wan Wai, Lam Kin

Pang , Leong Sio Long (undergraduate

students)

Design of a Tribometer for Studying High-Speed Electrical Sliding Wear of Contact Line Materials to FST/UM (2008/09) Report submitted to FST/UM BSc Final Project Report Sliding Wear Behavior of Copper-based Alloys for Electrical Contacts Chan Chan U, Chu Hio Cheng

(undergraduate students)