Cu-NiおよびCu-Ni-M系合金の内部硼化

概要

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Nickel boride has relatively high hardness, low electrical resistance and high melting point which are properties required of materials for electrical contacts and welding electrodes.It is well known that composite materials composed of metals and borides can be produced by sintering or melting. While sintering involves high cost and difficulty in achieving uniform distribution of the boride, melting has the disadvantage of crystallizing the boride at the solidification of the molten alloy, causing the formation of borides with particles that are too coarse.On immersion of Cu-Ni (5-95wt%) and Cu-Ni (5-50wt%)-M(0.2-10wt%, M: Ti, Si, Cr and Co) alloys in molten borax containing 30wt% B4C at 800-1000°C for 1-16hrs, boron diffused into the copper alloys to form a nickel boride dispersed layer only in the surface portion of copper alloys.Additions of Ti and Si to the copper alloys were effective to form finer boride particles uniformly.
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