First-principles Calculations and Experimental Study on Interface Strengthening of Brazed Diamond with Ni-Cr Filler

doi:10.3901/JME.2023.18.228

Abstract

Abstract: The micro-behavior and mechanism of brazed diamond with Ni-Cr filler doped with strong carbide-forming elements X(X=Mn, Ti, V, Zr, Nb, Mo, Hf, Ta, W) were systematically studied through first-principles calculations method, and the obtained results were verified by brazing diamond experiments. The calculation results of insertion energy, interfacial separation work and interface energy show that the strong carbide-forming element X tends to segregate at the interface between Ni-Cr filler and diamond, and the bonding strength and stability of interface between Ni-Cr filler and diamond are enhanced to varying degrees. Among them, Hf, Ta, Zr, Nb and W have the most obvious strengthening effect. Electron structure analyses show that the bonding between Cr atom in Ni-Cr filler and C atom in diamond can be promoted by doping X. The wettability of Ni-Cr filler to diamond is improved effectively, and the catalytic effect of Ni on diamond graphitization is weakened. Brazing diamond experiments based on Nb-doped Ni-Cr filler show that Nb doping makes the climbing effect of Ni-Cr filler on diamond more obvious, and the interfacial metallurgical reaction is more sufficient. Two kinds of carbides Cr₃C₂ and Cr₇C₃ are formed on the diamond surface, which effectively strengthens the interface between filler and diamond. Meanwhile, Nb doping also significantly weakens the catalytic effect of Ni element on diamond graphitization. Thus, the processing performance of brazed diamond specimen is improved, which verifies the theoretical calculation results. The obtained results provide the theoretical basis and reference for the design and development of filler alloy of brazing diamond based on material genome concept.

Key words: brazed diamonds, Ni-Cr filler alloy, interface strengthening, strong carbide-forming elements, first-principles calculations

CLC Number:

TG454

ZHANG Jian, XIAO Ang, ZHANG Ao, LIU Junyi, ZHANG Mingjun, PENG Ping. First-principles Calculations and Experimental Study on Interface Strengthening of Brazed Diamond with Ni-Cr Filler[J]. Journal of Mechanical Engineering, 2023, 59(18): 228-238.

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