Journal of the Korean institute of surface engineering (한국표면공학회지)
- Volume 22 Issue 4
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- Pages.161-167
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- 1989
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- 1225-8024(pISSN)
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- 2288-8403(eISSN)
A Study of the Electroless Ni-W-B Depsition on Alumina Ceramics
Alumina Ceramics상의 무전해 Ni-W-B 도금에 관한 연구
Abstract
Effects of bath composition on electroless deposition of Ni-W-B from sulphate solution were invesrigated in terms of deposition kinetics, electro resistivity and composition of deposit film. The microstruigated and crystataine structure of the films were also studied using a scanning electron microscope and X-ray diffractometer. The deposition rate increased linearly with increasing the concentration of nickel sulphate in bath solution, wheras the rate decreasing with sodium citrate. The rate was also affected by sodium tungstate, which was maaximum at the concentration of 0.06 M/1 in sodium tungstate, The content of W in the deposit increased with increased with increasing the sodium citrate had on opposite effect on the composition of W and B in the deposit. The crystal change film from armorphous to cryatallicne nature by heat treatments was proved by the reduction of specific resistance and X-ray diffration.
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