ＮｉとＮｉ‐Ｐ混合粉末による厚肉鋳鉄への表面被覆層形成

概要

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The coating on thich iron castings (50 mm in thickness) was prepared using a mixture of Ni powder and low melting point Ni-P powder as the coating powder on the mold. Several properties of the coated iron castings were tested. The main conclusions are :(1) When each Ni/(Ni-P) = 90/10, 75/25, 50/50 powder coated in single phase, no sound coated layer was obtained in spite of coating mass, much or less. (2) When coating with Ni/(Ni-P) = 75/25 powder first and then Ni/(Ni-P) = 90/10 powder at 120 mg/cm2 respectively, a soft surface layer (100∼200 HV1) containing 10∼20 % Ni was obtained. This layer showed good corrosion resistance to spraying NaCl solution. When Ni/(Ni-P) = 50/50 powder was costed followed by Ni/ (Ni-P) = 90/10 powder, a hard surface layer (∼400 HV1) containing 4∼8 % Ni was obtained. This showed good resistance to wet abrasion.(3) The choice of the ratio of Ni/(Ni-P) and double coating powder layers makes it possible to control excessive dissolution and assist surface sintering. The functional phase can be formed on the necessary parts even of the complex castings.
Japan Foundry Engineering Societyの論文