Researches on Preparation Techniques and Performance of WC-10Co4Cr Coatings
WC-10Co4Cr coatings,known for their high hardness and excellent performance of wear-resistance,have been widely applied in the aviation industry.In this paper,WC-10Co4Cr coatings were repared on A100 steel by high velocity oxygen fuel spraying.Optimum preparation conditions were btained through the method of orthogonal experiment.WC-10Co4Cr coatings were prepared at optimum conditions.Micro-hardness,residual stress,tensile strength and friction coefficient of WC-10Co4Cr coatings were tested.The results indicate that optimum kerosene flow and oxygen flow are 5.8 SCFH and 1 900 SCFH respectively.Appropriate spraying distance and powder-feed velocity are 350 mm and 9.5 r/min respectively.Average micro-hardness of WC-10Co4Cr coatings pre-pared at optimum conditions is 1 137 which is obviously higher than that of A100 steel substrate.Height of arc caused by residual stress is 0.373 mm.Tensile strength of the coating is higher than 70.9 MPa.Performance of WC-10Co4Cr coatings meets the aviation industry standard in aspects of micro-hardness,residual stress and tensile strength.Wear depth and wear volume of WC-10Co4Cr coatings are obviously lower than those of A100 steel substrate.Performance of wear-resistance for coatings is better than that of A100 steel.The wear mechanism of the A100 alloy steel is adhesive wear,whereas that of the WC-10Co4Cr coating is abrasive wear.
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