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Dent Mater J. 2009 Sep;28(5):587-94.

Grindability of alpha-case formed on cast titanium.

Author information

  • 1Texas A&M Health Science Center, Baylor College of Dentistry, Department of Biomaterials Science, Dallas TX 75246, USA. mkoike@bcd.tamhsc.edu

Abstract

The hardened alpha-case (alpha-case) layer inevitably forms on the surface of titanium castings when prepared by investment casting. Because the hardness of the alpha-case is incomparable to that of the interior structure, the perception exists that the alpha-case is difficult to remove during cutting, grinding and polishing. Grindability (ease of grinding) of cast cpTi and cast Ti-6Al-4V was evaluated by grinding cast specimens incrementally using a SiC abrasive wheel. The present study revealed that the presence of the brittle alpha-case with lower fracture toughness is beneficial in grinding titanium. The alpha-case on the ductile cpTi can be ground much easier than its bulk interior structure. In less ductile Ti-6Al-4V, the grinding rate is much higher than that of cpTi, and the alpha-case and its interior structure are at similar levels since the fracture toughness of its alpha-case and the bulk material is not large enough.

PMID:
19822990
[PubMed - indexed for MEDLINE]
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