title: Grindability of cast Ti-Hf alloys.
abstract: As part of our systematic studies characterizing the properties of titanium alloys, we investigated the grindability of a series of cast Ti-Hf alloys. Alloy buttons with hafnium concentrations up to 40 mass% were made using an argon-arc melting furnace. Each button was cast into a magnesia-based mold using a dental titanium casting machine; three specimens were made for each metal. Prior to testing, the hardened surface layer was removed. The specimens were ground at five different speeds for 1 min at 0.98 N using a carborundum wheel on an electric dental handpiece. Grindability was evaluated as the volume of metal removed per minute (grinding rate) and the volume ratio of metal removed compared to the wheel material lost (grinding ratio). The data were analyzed using ANOVA. A trend of increasing grindability was found with increasing amounts of hafnium, although there was no statistical difference in the grindability with increasing hafnium contents. We also found that hafnium may be used to harden or strengthen titanium without deteriorating the grindability.
authors.affiliation: Division of Dental Biomaterials, Graduate School of Dentistry, Tohoku University, 4-1, Seiryo-machi, Sendai, 980-8575 Japan. kikuchi@mail.tains.tohoku.ac.jp
authors.forename: Masafumi
authors.initials: M
authors.lastname: Kikuchi
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Takahashi
authors.forename: Hideki
authors.initials: H
authors.lastname: Sato
authors.forename: Osamu
authors.initials: O
authors.lastname: Okuno
authors.forename: Martha E
authors.initials: ME
authors.lastname: Nunn
authors.forename: Toru
authors.initials: T
authors.lastname: Okabe
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry; D003722:Dental Alloys / Q000737:chemistry*; D003735:Dental Casting Technique; D006195:Hafnium / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D014025:Titanium / Q000737:chemistry*
chemical_list: D001672:Biocompatible Materials; D003722:Dental Alloys; D014025:Titanium; D006195:Hafnium