Cailiao Baohu (Oct 2022)

Deposition Behavior of Electroless Nickel Coating on High Volume Fraction SiCp/Al Composites Pretreated with Zinc Immersion

  • FENG Li, YANG Xin, PANG Jian, SUN Haoran, CHENG De, CUI Qingxin, TAN Yeshen, XU Junjie

DOI
https://doi.org/10.16577/j.issn.1001-1560.2022.0269
Journal volume & issue
Vol. 55, no. 10
pp. 11 – 16

Abstract

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High volume fraction SiCp/Al composites are widely used in the field of electronic packaging.In this paper,electroless nickel coatings were prepared on the surface of high volume fraction SiCp/Al composites pretreated with zinc immersion,and the growth behavior of the coatings was studied by scanning electron microscope (SEM) and energy dispersive spectrometer (EDS).Results showed that the initial deposition of electroless nickel coating on the substrate preferentially occurred on the surface of Al phase.The coating on SiC particles mainly originated from the two-dimensional growth of electroless nickel layer on Al phase.Moreover,the small-size SiC particles around Al phase were covered by coating in 90 s,while the large-size SiC particles were completely covered by coating after 40 min.Besides,the excellent adhesive strength of coating was mainly due to the mechanical interaction between the coating on Al phase and small-size SiC particles and the substrate,as well as the low internal stress of the initial deposited coating on large-size SiC particles.

Keywords