In situ structural evolution of arc-deposited Cr-based coatings

SURFACE & COATINGS TECHNOLOGY

卷:202

Article; Proceedings Paper

Neves, A. M.¹  Severo, V.¹  Cvrcek, L.²  Polcar, T.³  Louro, C.¹  Cavaleiro, A.¹ 

[1] Univ Coimbra, Dept Mech Engn, SEG CEMUC, P-3030788 Coimbra, Portugal

[2] HVM Plasma Ltd, Prague 15800 5, Czech Republic

[3] Czech Tech Univ, Fac Elect Engn, Dept Control Engn, Prague 6, Czech Republic

关键词: Arc evaporation;    Chromium nitride;    Carbonitride coatings;    Thermal stability;    HTXRD;   

DOI  :  10.1016/j.surfcoat.2008.06.102

来源: Elsevier

【 摘 要 】

Cr-based coatings were prepared by cathode arc-evaporation technology using N-2 and C2H2 as reactive gases. Three compositions were investigated, Cr60N40, Cr41N27C32 and Cr67C33. The present investigation is centred on the structural stability via coatings tempering up to 1000 degrees C, by in situ X-ray diffraction in protective atmosphere. As-deposited coatings present low order structure with a medium feature size less then 10 nm. The hexagonal beta-Cr2N phase, characteristic of binary Cr60N40 coating, was stable up to 900 degrees C, before recrystallization and grain growth takes place. For Cr41N27C32 film the phase transition varies from the metastable delta-Cr(N,C) to orthorhombic chromium carbonitride Cr-3(CxN1-x)(2) phase up to 800 degrees C and then to chromium carbide phase. No chromium nitride phases were detected in spite of the similar N and C contents after the deposition. The Cr-C coating recrystallizes into a mixture of carbide phases, mainly Cr3C2 and Cr23C6 after 1000 degrees C annealing treatment. (C) 2008 Elsevier B.V. All rights reserved.

【 授权许可】

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