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Mechanical Surface Properties of CoCr Alloys After Nitrogen PIII
Author(s) -
Eichentopf IngaMaria,
Lehmann Antje,
Lutz Johanna,
Gerlach Jürgen W.,
Mändl Stephan
Publication year - 2007
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.200730304
Subject(s) - materials science , plasma immersion ion implantation , nitrogen , ion implantation , diffraction , diffusion , phase (matter) , immersion (mathematics) , activation energy , layer (electronics) , surface layer , hardness , composite material , metallurgy , ion , chemistry , thermodynamics , optics , physics , mathematics , organic chemistry , pure mathematics
Abstract Initial experiments were performed to improve the mechanical surface properties of CoCr alloys by nitrogen plasma immersion ion implantation (PIII). Fast thermally activated diffusion with an activation energy of 0.6 eV was observed. A detailed investigation of the phase formation by X‐ray diffraction revealed a variable phase composition with CrN and Cr 2 N being dominating at higher temperatures and additional fcc phases being present. The hardness of the surface layer increased from about 300 HV by a factor of 3–5 while the wear rate was reduced by a factor of up to ten as a result of the PIII treatment.