Analysis of Laser-Brazed Diamond Particle Microstructures

Zhibo YANG, Aiju LIU, Ruiyun YANG

Abstract


Brazing diamond particles to a steel substrate using Ni-based filler alloy was carried out via laser in an argon atmosphere. The brazed diamond particles were detected by scanning electron microscope (SEM), X-ray diffraction (XRD), and energy dispersive X-ray spectroscopy (EDS). The formation mechanism of carbide layers was discussed. All the results indicated that a high-strength bond between the diamond particles and the steel substrate was successfully realized. The chromium in the Ni-based alloy segregated preferentially to the surfaces of the diamonds to form a chromium-rich reaction product, and the bond between the alloy and the steel substrate was established through a cross-diffusion of iron and Ni-based alloy.

DOI: http://dx.doi.org/10.5755/j01.ms.21.4.9626


Keywords


laser brazing, diamond, Ni-base alloy, interfacial microstructure

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Print ISSN: 1392–1320
Online ISSN: 2029–7289