Abstract
An innovative manufacturing method to fabricate tubular parts made of tungsten heavy alloy (THA) by diffusion bonding of sintered semicircular tubes is proposed and characterized in this study. THAs are produced by blending tungsten grains with a lower-melting-point Ni-Fe binder metal. During the liquid phase sintering (LPS) process of THA, the Ni-Fe liquid wets the tungsten and provides a soluble diffusion network for rapid sintering. Multi-phase THAs are usually very difficult to produce as a tubular piece. During the LPS of the powder compact, a gravity-induced slumping leads to some distortion in the bottom of the tubular parts. One possible alternative to handle this problem is to combine the segmented THA pieces by solid-state diffusion bonding to build up tubular piece. Thus, this study proposes combining the semicircular THA tubes using the diffusion bonding technique to manufacture the tubular THA parts. To provide uniform contact pressures along the joining surfaces, horizontal diffusion bonding is performed using a specially constructed supporting apparatus to reduce the gravity effect. An industry-applicable tube manufacturing process has been well characterized, and its feasibility has been demonstrated by bond quality that was assessed by optical metallography and mechanical testing.
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Acknowledgment
This work was partially supported by a National Research Foundation of Korea (NRF) Grant funded by the Korean Government (MSIP) (No. 2012R1A5A1048294).
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Park, Z.S., Han, S.W., Kim, J.H. et al. Manufacture of Tungsten Heavy Alloy Tube by Diffusion Bonding of Semicircular Tubes. J. of Materi Eng and Perform 29, 699–711 (2020). https://doi.org/10.1007/s11665-020-04587-2
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DOI: https://doi.org/10.1007/s11665-020-04587-2