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Characterization of electroplated Ni/SiC and Ni/Al2O3 composite coatings bearing nanoparticles

Published online by Cambridge University Press:  31 January 2011

Sheng-Chang Wang  and
Wen-Cheng J. Wei
Sheng-Chang Wang
Affiliation:
Institute of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan 106, Republic of China
Wen-Cheng J. Wei*
Affiliation:
Institute of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan 106, Republic of China
*
a)Address all correspondence to this author. 1 Roosevelt Road, Sec. 4, Taipei, Taiwan 106, Republic of China. e-mail: wjwei@ccms.ntu.edu.tw
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Abstract

Ultrafine SiC and Al2O3 particles with 30–50 nm sizes were used to codeposit with Ni in a sulfamate bath to form composite coatings. The microstructure and mechanical properties of the layers were investigated by x-ray diffractometry, scanning and transmission electron microscopy, high-resolution transmission electron microscopy, microindentation, and wear testing. The microstructural results revealed that 7 vol% of SiC or Al2O3 particles dispersed randomly in the Ni matrix. The addition of the ultrafine SiC or Al2O3powder into the Ni matrix apparently reduced the size of Ni grains during the electroplating and inhibited the grain growth during heat treatment. The microhardness and wear resistance were improved by the addition of SiC and Al2O3 particles, especially for SiC/Ni samples after heat treatment at 400 °C for 24 h. The mechanisms of hardening and wearing of Ni-based electroplated layers are discussed.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 7 , July 2003 , pp. 1566 - 1574
Copyright
Copyright © Materials Research Society 2003

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