Abstract
The composition, structure, and properties of coatings obtained by the high-velocity gas-flame spraying of composite powders based on TiCN with additions of SiC, AlN, SiC ― AlN/Al2O3 and a binder of Ni―Cr based alloy were investigated. The working surfaces of coatings were studied by metallographic, petrographic, x-ray diffraction, electron-probe analyses, and scanning electron microscopy. It was determined that coatings ≈200 μm in thickness had a typical finely dispersed lamellar structure with layers enriched in titanium alternating with layers of Ni―Cr alloy. The tribological properties of developed coatings were superior to those of the standard WC + 8% Co alloy: under dry friction at a load of 2 MPa and sliding velocities in the range 5-15 m/sec the coefficient of friction was 0.17-0.11, and wear rate 3.4-8.5 μm/km. The high oxidation resistance of the coatings is due to the presence, in the outer scale layer, of refractory compounds Al2SiO5, (Cr, Al)2O3, and Al2TiO5, which prevent the diffusion of oxygen into the substrate. The mass gain of the coating based on TiCN ― SiC ― AlN was 1.42 mg/cm2 at 1450°C.
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Podchernyaeva, I.A., Frolov, G.A. Wear- and Scaling-Resistant Coatings Based on TiCN. Powder Metallurgy and Metal Ceramics 40, 247–257 (2001). https://doi.org/10.1023/A:1012849331339
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DOI: https://doi.org/10.1023/A:1012849331339