Effect of plasma nitriding on adhesion strength of CrTiAlN coatings on H13 steels by closed field unbalanced magnetron sputter ion plating

A duplex treatment, i.e. plasma nitriding followed by closed field unbalanced magnetron sputter ion plating, is used to strengthen the bonding of CrTiAlN coatings to H13 steels in the paper. A nitride layer is first formed on H13 steel samples by plasma nitriding and then two chromium transition lay...

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Bibliographic Details
Published in:Surface & coatings technology 2013-08, Vol.229, p.146-150
Main Authors: Ge, P.L., Bao, M.D., Zhang, H.J., You, K., Liu, X.P.
Format: Article
Language:English
Subjects:
Adhesion strength
Adhesive bonding
Adhesive strength
Adhesive wear
Applied sciences
Chromium molybdenum vanadium steels
Coatings
Cross-disciplinary physics: materials science
rheology
CrTiAlN coating
Die steels
Exact sciences and technology
Heat treatment
Hot work tool steels
Ion nitriding
Ion plating
Magnetron sputter
Materials science
Metals. Metallurgy
Physics
Plasma nitriding
Production techniques
Strength
Structural steels
Surface treatment
Surface treatments
Thermochemical treatment and diffusion treatment
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Summary:A duplex treatment, i.e. plasma nitriding followed by closed field unbalanced magnetron sputter ion plating, is used to strengthen the bonding of CrTiAlN coatings to H13 steels in the paper. A nitride layer is first formed on H13 steel samples by plasma nitriding and then two chromium transition layers are prepared on the surface of the nitrided H13 steels using closed field unbalanced magnetron sputter ion plating. The adhesion between the substrate and the coating is evaluated using the Rockwell indentation and scratch tests. Meanwhile, the composition, phase structure and the morphologies for CrTiAlN coatings as well as the worn surfaces are characterized by EDX, SEM and XRD, respectively. Dry sliding wear behavior of the duplex-treated H13 steels is analyzed by using ball-on-disk wear tests compared with those of untreated and plasma-nitrided H13 steels. The results show that the adhesion strength and wear resistance for duplex-treated coatings increase significantly due to a gradient-hardness support, one favorable gradient of chemical composition, an intermediate hardening effect and a diffusion reaction of the nitrided layer-coating interface. ► We combined a CrTiAlN hard coating with plasma nitriding treatment. ► We find that duplex-treatment is effective in enhancing adhesion and wear resistance. ► Surface hardening and gradated hardness lead to good adhesion and tribological properties.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2012.08.002