Abstract
The coating on iron castings was prepared using a mixture of ferrochromium alloy powder and self-fused Ni based alloy powder with low melting point as the coating powder on the mold. The temperature of the coating powder layer after casting was measured, and several functional properties of the coated iron castings obtained were tested. The main conclusions drawn are : (1) The highest temperature attained in the coating powder layer, which determines the degree of sintering in this layer, is greatly affected by the thickness of the layer and castings. (2) Alumina powder used as heat-retaining material is very effective for maintaining high temperarure in thick coating powder layers and thin castings. (3) The coated iron castings obtained have substantial hardness and good resistance to wet abrasion. corrosion and oxidation at high temperatures.
