フェロクロム粉と低融点 Ni 基合金粉による鋳鉄の表面被覆法

概要

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Coating of functional and thicker layer on iron castings was prepared by using mixture of ferrochromium alloy powder and three kinds of Ni based alloy powders having low melting point as coating powder on the mold. The main results obtained were as follows : (1) The best coating layer which contains a little amount of porosity and is 2-3 mm in thickness and 800-900 numbers in Vickers hardness, can be obtained by a suitable mixing ratio (ferrochromium powder/self-fused Ni based alloy powder) at each location of the mold. The ratio should be lower in order to get well sintering coating layer powder, thus more liquid can be supplied at such rapid cooling location as edge corner of mold. (2) When Ni-P or Ni-P-Cr powder was mixed, the large pores have a tendency to remain in the coating layer because the liquids have poor wettability with ferrochromium.
Japan Foundry Engineering Societyの論文