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Microstructure and thermal stability of arc-evaporated Cr-C-N coatings
Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för fysik, kemi och biologi, Nanostrukturerade material.ORCID-id: 0000-0002-2286-5588
2004 (engelsk)Inngår i: PHILOSOPHICAL MAGAZINE, ISSN 1478-6443, Vol. 84, nr 7, s. 611-630Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The role of C incorporation in the microstructure and thermal stability of arc-evaporated Cr-C-N coatings is explored via reactive growth in a mixed C2H4-N-2 environment. C is found to react more readily than N at both the Cr cathode and the coating surfaces, so that a C2H4-to-N-2 flow ratio of only 1% yields a C-to-N ratio of approximately 10% within the coatings. The as-deposited microstructures consist primarily of the delta-Cr(C, N) phase and possess high compressive residual stresses, which decrease with increasing C content. Post-deposition annealing up to 700degreesC results in depletion of lattice defects, and concomitant reductions in stress and coating hardness, together with phase transformations which suggest metastable phase formation during growth. Apparent activation energies for this lattice defect are found to be in the range expected for bulk diffusion of N and C (2.4-2.8 eV). The results suggest that inclusion of small amounts of C in this system offers the ability to reduce internal stresses while maintaining defect-related hardness increases, permitting growth of thicker and thus more wear-resistant coatings.

sted, utgiver, år, opplag, sider
2004. Vol. 84, nr 7, s. 611-630
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-46285DOI: 10.1080/14786430310001646727OAI: oai:DiVA.org:liu-46285DiVA, id: diva2:267181
Tilgjengelig fra: 2009-10-11 Laget: 2009-10-11 Sist oppdatert: 2013-10-02

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