Quality improvement of a β-type titanium alloy cast for biomedical applications by using a calcia mold

Harumi Tsutsumi, Mitsuo Niinomi, Toshikazu Akahori, Masaaki Nakai, Tsutomu Takeuchi, Shigeki Katsura

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The applicability of a calcia mold to casting a β-type titanium alloy, Ti-29Nb-13Ta-4.6Zr (TNTZ), was evaluated with focusing on the dimensional accuracy of the casting in this study. Pure zirconium particles were added to a calcia mold to take advantage of the expansion of oxidized zirconium during the baking process in order to compensate for the solidification shrinkage of TNTZ. The morphological characteristics of the casting surface, such as the roughness and dimensional accuracy, of the cast TNTZ were investigated. The dilation ratio of the calcia mold is found to increase with increasing the number of pure zirconium particles. The addition of 12 mass % or 14 mass % pure zirconium particles compensates for not only the solidification of TNTZ but also the occurrence of shrinkage of the calcia mold. In addition, the formation of a surface reaction layer in TNTZ is restrained to a larger extent by casting into a calcia mold than into a magnesia mold, which is the conventional investment mold for titanium casting. Furthermore, the volume fraction and number of casting defects are also restrained to a larger extent by casting into a calcia mold than into a magnesia mold. The results of this study should lead to enhancements in the creation of cast TNTZ for dental products.

Original languageEnglish
Pages (from-to)170-176
Number of pages7
JournalKeikinzoku/Journal of Japan Institute of Light Metals
Volume60
Issue number4
DOIs
Publication statusPublished - 2010 Apr

Keywords

  • Calcia mold
  • Dental precision casting
  • Dimensional accuracy
  • Magnesia mold
  • β-type titanium alloy

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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