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Die-less manufacturing of tube by diffusion bonding of unit rods made of tungsten heavy alloy

  • Zu Seong Park
  • Chester J. VanTyne
  • Jeong Kim
  • Tae Woo Hwang
  • Yangjin Kim
  • Young Hoon MoonEmail author
ORIGINAL ARTICLE
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Abstract

A die-less method to manufacture tubes by diffusion bonding of rods made of tungsten heavy alloys was developed and characterized. Tungsten heavy alloys are pseudo-alloys of tungsten (W) with small amounts of lower-melting-point binder metals, typically Ni and Fe, and they are widely used in tubular shapes. Due to the excessively high consolidation temperature for W, the fabrication of components is normally done by sintering of powder compacts. During the sintering of W–Ni–Fe alloys, the partially melted Ni–Fe binder metal wets the tungsten powder particles and provides a soluble diffusion network for rapid sintering. However, as the binder metals partially liquefy, this process results in gravity-induced slumping, leading to distortion near the bottom section of the tubular part. This gravity-induced slumping creates significant difficulties during the production of tubular structures. A rod shape is the most stable shape to avoid slumping during sintering. Thus, a method to manufacture tubular tungsten heavy-alloy parts via joining of sintered rods by diffusion bonding was developed. Using an analytical model, the dimensions of the unit rods for fabrication of the target tube shape have been designed. An industry-applicable tube manufacturing process was well characterized, and the feasibility of the process was confirmed.

Keywords

Tungsten heavy alloy Rod Liquid-phase sintering Diffusion bonding Slumping 

Notes

Funding information

This work was partially supported by a National Research Foundation of Korea (NRF) grant, funded by the Korean government (MSIP) (no. 2012R1A5A1048294).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag London Ltd., part of Springer Nature 2019

Authors and Affiliations

  1. 1.R&D CenterGyeongjuRepublic of Korea
  2. 2.Department of Metallurgical and Materials EngineeringColorado School of MinesGoldenUSA
  3. 3.Department of Aerospace EngineeringPusan National UniversityBusanRepublic of Korea
  4. 4.School of Mechanical EngineeringPusan National UniversityBusanRepublic of Korea

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