Influence of Temperature on the Phases Changes of HVOF Sprayed Tungsten Carbide Coatings
Keywords:
HVOF, tungsten carbide, coatings, X-ray diffraction, heat treatment, phases, crystallite size, specimens.Abstract
Tungsten carbide coatings (WC + 12 % Co) have been prepared using High Velocity Oxygen Fuel (HVOF) gun. Coatings approximately 300 μm thick were formed on the specimens surface. After deposition coatings have been heated at the temperatures between 200 °C and 1000 °C. X-ray diffraction has been used to analyze the phase transformation after spraying and heat treatment of coatings.
The WC and W6C2.5 phases were found. After the heat treatment above 450 °C the formation of WO3 phase started. Above 600 °C all phases of WC and W6C2.5 transformed into WO3 and CoWO4 phases. Temperature influence on the crystallite size was investigated.
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