Abstract
The effect of heat treatment on hardness and wear resistance of WC-27%NiCr sprayed coating on SUS403 made by High Velocity Oxygen Fuel Spraying (HVOF) has been studied to improve abrasive wear resistance.Specimens were heated to either 573, 673 and 773 K and held at those temperature for various times, up to 45 h. The change in micro-vickers hardness (load 2.94 N) after heat treatment was measured after the samples coold to room temperature. The wear rate of the specimens against α-SiC with the plane-on-plane contact pressure of 0.196 MPa, in water suspending 9 mass% silica powder were measured by a sliding velocity of 0.5 m/s.The results obtained are as follows:(1) Heat treatment increased the hardness of WC-27%NiCr sprayed coatings.(2) The increase of the hardness due to heat treatment was dependent on the void decreasing of the sprayed coatings.(3) The wear rate of the heated WC-27%NiCr sprayed coatings in water suspending silica powder became triple increment against that of the coating before heating.
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