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XPS and micro-mechanical characterisation of nitrogen ion implanted low alloy steel
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作者 a.o.olofinjana Z.Chen J.M.Bell 《Science China Mathematics》 SCIE 2001年第S1期354-361,共8页
The surface composition of low alloy steel after N_2^+ implantation was studied with X-ray photo-electron spectroscopy (XPS). The effect of the implantation on the mechanical hardness was evaluated by ultra-micro hard... The surface composition of low alloy steel after N_2^+ implantation was studied with X-ray photo-electron spectroscopy (XPS). The effect of the implantation on the mechanical hardness was evaluated by ultra-micro hardness indentation. Chemical characterisation of the surface indi- cated that a thin layer rich in N, C and Si was formed. It is shown that Fe played little role in the chemical composition and the structure of the modified surface. The mechanical hardness of N_2^+ implanted surface was 35-50 GPa compared with a value of 10 GPa for the untreated sample. It is thought that the high hardness observed on the surface and in the sub-surface was as a result of chemical modification to form a film of Si doped carbon nitride. There is strong evidence from the XPS and the nanoindentation studies that the bonding structure of the C-N in the near surface is essentially sp^3 types expected in crystalline C_3N_4. The value of nitrogen ion implantation as process for improving the wear resistance of low alloy steels is emphasized. 展开更多
关键词 surface modification ION IMPLANTATION low alloy steels Si doped carbon NITRIDE
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