Abstract
This paper demonstrates the possibility of nitriding of titanium by a forevacuum electron source. We present an original design of the experimental setup and the measurements of the tribological properties and elemental composition of the subsurface layer of the titanium experimental sample. Raster electron microscopy analysis of the nitride sample have demonstrated that titanium and nitrogen are found to be the main chemical elements; oxygen and carbon also present, though their total concentration does not exceed 6 wt. %. The thickness of the modified layer after a 75-minute long process of nitriding was about 8 µm. Wear resistance test of have shown that the nitrided sample has a 500 times less loss of the material as compared with the original titanium sample, meaning a times-fold increase of resistance to wear.
Highlights
The nitriding of metals is a widely known method of improving their operational properties [1]
It is currently generally accepted that the main effect exerted by an electron beam on a solid body, when it is irradiated in high vacuum, consists in heating [2]
Since the sample surface hardening is connected with the presence of nitrogen atoms near the work piece being processed, we performed the mass-charge analysis to determine the constituent composition of the beam plasma ions in order to find optimal parameters of the electron beam for nitriding
Summary
The nitriding of metals is a widely known method of improving their operational properties [1]. The specifics of interaction between the solid sample processed by the beam of the charged particles and the plasma forming within its vicinity will determine the character of changes occurring in the surface layer of the sample. The method of plasma ion nitriding is used to form thin micrometer layers of transition metal nitrides on the surfaces of steel parts. We performed nitriding of titanium using a forevacuum electron source.
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