A net-shape forming process of Ti–6Al–4V sphere joints

Ce Zhang, Yu Pan, Jianzhuo Sun, Xin Lu, Jiazhen Zhang

Research output: Contribution to journalArticlepeer-review

Abstract

Near-net shape forming of the hollow sphere joints (60 mm in diameter) used in large space truss structure of spacecraft was realised by powder injection molding and diffusion bonding. For metal injection molding (MIM) process, two binder systems based on polyoxymethylene (POM) and paraffin wax (PW) are comparatively studied. The powder loading, power law index, viscous flow activation energy and integrated rheological factors of feedstock were systematically studied. Except powder loading, The feedstock based on POM system has a smaller strain and temperature sensitivity (n = 0.368, E = 17.95 kJ mol−1) and better rheological properties (α = 6.3). The lowest interstitials contents of as-sintered samples are 0.05 wt-% for C, 0.28 wt-% for O and 0.046 wt-% for N, which meet the Grade 5 PM (Ti–6Al–4V) specifications according to ASTM B988-13. The tensile strength and ductility reach 978 MPa and 6.3%, respectively, after 1300 °C sintering and capsule-free hot isostatic pressing (HIP).

Original languageEnglish
Pages (from-to)404-411
Number of pages8
JournalPowder Metallurgy
Volume64
Issue number5
DOIs
Publication statusPublished - 2021
Externally publishedYes

Keywords

  • Titanium alloys
  • hollow sphere joints
  • mechanical properties
  • microstructure
  • powder injection molding

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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