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Surface Hardening of Copper-Nickel Alloys with Boronizing(Materials, Metallurgy & Weldability)

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By means of boronizing method in argon atmospheric furnace with boron powder surface hardening of various copper-nickel alloy have been investigated. Then the minimum alloying amount of nickel in copper which was required to make surface hardening was determined. Moreover the effects of temperature (700 to 1000℃) and time (up to 6 hrs) dependencies for boronizing were also investigated. As a result, the surface hardening with boronizing layer obviously occurred in the alloys more than 30% nickel in copper when heat treating temperature was raised more than 800℃. However in 5% nickel-copper alloy the boronizing layer without hardening was only seen though in commercially pure copper there was neither boronizing nor hardening layer. The minimum alloying amount of nickel in copper for surface hardening was assumed at about 10%. The boronized surfaces of these nickel-copper alloys showed about 1000 VHN in maximum hardness and 150 to 200μm in maximum depth within the range in this investigation, and the precipitation of Ni_2B which was revealed with X-ray diffractive investigation.



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