title: Casting behavior of titanium alloys in a centrifugal casting machine.
abstract: Since dental casting requires replication of complex shapes with great accuracy, this study examined how well some commercial titanium alloys and experimental titanium-copper alloys filled a mold cavity. The metals examined were three types of commercial dental titanium [commercially pure titanium (hereinafter noted as CP-Ti), Ti-6Al-4V (T64) and Ti-6Al-7Nb (T67)], and experimental titanium-copper alloys [3%, 5% and 10% Cu (mass %)]. The volume percentage filling the cavity was evaluated in castings prepared in a very thin perforated sheet pattern and cast in a centrifugal casting machine. The flow behavior of the molten metal was also examined using a so-called "tracer element technique." The amounts of CP-Ti and all the Ti-Cu alloys filling the cavity were similar; less T64 and T67 filled the cavity. However, the Ti-Cu alloys failed to reach the end of the cavities due to a lower fluidity compared to the other metals. A mold prepared with specially designed perforated sheets was effective at differentiating the flow behavior of the metals tested. The present technique also revealed that the more viscous Ti-Cu alloys with a wide freezing range failed to sequentially flow to the end of the cavity.
authors.affiliation: Department of Oral Health Science, Division of Dental Biomaterials Science, Graduate School of Medical and Dental Science, Niigata University, 2-5274 Gakkouchou-dori, Niigata 951-8514, Japan. watakou@dent.niigata-u.ac.jp
authors.forename: K
authors.initials: K
authors.lastname: Watanabe
authors.forename: O
authors.initials: O
authors.lastname: Miyakawa
authors.forename: Y
authors.initials: Y
authors.lastname: Takada
authors.forename: O
authors.initials: O
authors.lastname: Okuno
authors.forename: T
authors.initials: T
authors.lastname: Okabe
mesh_terms: D000497:Alloys / Q000737:chemistry*; D002498:Centrifugation / Q000295:instrumentation; D003300:Copper / Q000737:chemistry; D003735:Dental Casting Technique / Q000295:instrumentation; D006801:Humans; D066298:In Vitro Techniques; D008422:Materials Testing; D014025:Titanium / Q000737:chemistry*
chemical_list: D000497:Alloys; C070282:Ti-6Al-7Nb alloy; C031462:titanium alloy (TiAl6V4); D003300:Copper; D014025:Titanium