Microstructure and electric conductivity of laser clad TiB2/Cu coating on pure copper

LI Yan; ZHANG Yong-zhong; HUANG Can; GONG Xin-yong; LIU Ming-kun

doi:10.3969/j.issn.1001-3806.2012.05.003

In order to meet the requirement for electromagnetic rails,through presetting powder on pure copper surface,TiB2/Cu coatings with different proportion of TiB2 were prepared by means of laser cladding.The microstructure and phases were investigated with optical microscopy,scanning electron microscopy and X-ray diffraction.The coating composed of Cu and TiB2,when the mass fraction of TiB2 is 0.02,0.05 and 0.1,the micro-hardness of the coating is approximately 95HV0.1,105HV0.1and 152HV0.1,and the electrical conductivity is 22.9MS/m,20.4MS/m and 16.4MS/m respectively.The coating metallurgically bonded with the substrate,free of cracks,and some agglomerated TiB2 particles exist.The clad layer possesses the epitaxial growth of columnar crystal.The results show that with increase of TiB2 content,the micro-hardness of TiB2/Cu coatings increases,and the conductivity decreases.

Microstructure and electric conductivity of laser clad TiB2/Cu coating on pure copper

Corresponding author: ZHANG Yong-zhong, yyzhang@grinm.com;

1. State Key Laboratory of Advanced Design and Manufacturing for Body, Hunan University, Changsha 410082, China;

Received Date: 2011-12-22

Accepted Date: 2012-02-24

Available Online: 2012-09-25

Abstract: In order to meet the requirement for electromagnetic rails,through presetting powder on pure copper surface,TiB2/Cu coatings with different proportion of TiB2 were prepared by means of laser cladding.The microstructure and phases were investigated with optical microscopy,scanning electron microscopy and X-ray diffraction.The coating composed of Cu and TiB2,when the mass fraction of TiB2 is 0.02,0.05 and 0.1,the micro-hardness of the coating is approximately 95HV0.1,105HV0.1and 152HV0.1,and the electrical conductivity is 22.9MS/m,20.4MS/m and 16.4MS/m respectively.The coating metallurgically bonded with the substrate,free of cracks,and some agglomerated TiB2 particles exist.The clad layer possesses the epitaxial growth of columnar crystal.The results show that with increase of TiB2 content,the micro-hardness of TiB2/Cu coatings increases,and the conductivity decreases.

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Reference (15)

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Microstructure and electric conductivity of laser clad TiB2/Cu coating on pure copper

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