Abstract
In this study, K30 (W 90 wt%, Co 10 wt%) and DX5 (W 84 wt%, Co 16 wt%) tungsten carbide were used as base metals for transient liquid-phase diffusion bonding (TLPDB). The filler metal was MBF20, a type of nickel alloy used to minimize the residual stresses that occur due to the differences in the expansion coefficients of the metals. MBF20 contained B, Si, and Cr, which reduced the melting point of the nickel alloy and enhanced its mechanical properties. The base metal and filler metal surfaces were cleaned by mechanical polishing and cleaning. Diffusion bonding was performed under vacuum at 1,000–1,500 K under low pressure than buckling load conditions. The microstructure on the localized bonded surface was analyzed using scanning electron microscope (SEM) and optical microscopy. Result of no significant change was observed in the diffusion bonding in the low-to-mid temperature range due to insufficient filler metal or base metal dissolution at the bonding site. However, at high temperatures, the filler completely melted and bonded to the base metal on both sides. Our results showed that temperatures approaching the recrystallization temperature were required to provide high-quality welds for ultra-precision joints and micro polycrystalline diamond (PCD) tool fabrication.
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Recommended by Guest Editor Haedo Jeong
Jeongwoo Park received the B.S., M.S., and Ph.D. degrees in precision mechanical from Pusan National University, Pusan, Korea. In 2013 he joined university of Toyama, Japan as a research professor. He is currently a professor of mechanical Design Engineering at Chosun University, Gwangju, Korea. His research interests are in the fields of ultra precision machining, micro-nano fabrication, and non-traditional machining/systems.
Bawi Jeong received a B.S. in Mechanical Design Engineering, Chosun University, Korea. In 2013 he is currently a M.S. candidate of the Department of Advanced Parts and Materials Engineering at Chosun University. Gwangju, Korea. His research interests are in surface texturing and high tech bonding process.
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Jeong, B., Park, J. Transient liquid phase diffusion bonding for micro PCD tool fabrication. J Mech Sci Technol 27, 3005–3010 (2013). https://doi.org/10.1007/s12206-013-0817-0
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DOI: https://doi.org/10.1007/s12206-013-0817-0