Title: Microstructural and topographical changes of Ni-P plated moulds in glass lens pressing

Authors: Jun Masuda, Jiwang Yan, Takaharu Tashiro, Yasushi Fukase, Tianfeng Zhou, Tsunemoto Kuriyagawa

Addresses: Toshiba Machine Corporation, Ooka 2068-3, Numazu, Shizuoka 410-8510, Japan. ' Department of Nanomechanics, Tohoku University, Aramaki Aoba 6-6-01, Aoba-ku, Sendai, 980-8579, Japan. ' Toshiba Machine Corporation, Ooka 2068-3, Numazu, Shizuoka 410-8510, Japan. ' Toshiba Machine Corporation, Ooka 2068-3, Numazu, Shizuoka 410-8510, Japan. ' Department of Nanomechanics, Tohoku University, Aramaki Aoba 6-6-01, Aoba-ku, Sendai, 980-8579, Japan. ' Department of Nanomechanics, Tohoku University, Aramaki Aoba 6-6-01, Aoba-ku, Sendai, 980-8579, Japan.

Abstract: The changes in microstructure and topography of nickel-phosphorus (Ni-P) plated steel moulds in a glass lens moulding process were investigated by heating tests. The results show that, at a high temperature, Ni atoms diffuse from the inner Ni-P plating layer into the outer release agent coating consisting of precious metals. The atomic diffusion leads to partial surface swelling, which makes the mould surface rough and cloudy. The diffusion is influenced by the temperature, interface structure and stress state of the moulds. These findings provide references for developing new mould materials and for improving the service life of the moulds.

Keywords: glass moulding; mould structure; surface coating; Ni-P plating; atomic diffusion; interface phenomenon; microstructure; topography; nickel-phosphorus plating; plated steel moulds; glass lens; lens moulding.

DOI: 10.1504/IJSURFSE.2009.024363

International Journal of Surface Science and Engineering, 2009 Vol.3 No.1/2, pp.86 - 102

Available online: 01 Apr 2009 *

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