title: Castability and surface hardness of titanium cast plates obtained from experimental phosphate-bonded silica investment molds.
abstract: The effect of 12 different experimental compositions of phosphate-bonded SiO2 investments was examined on cast pure titanium. The mold temperature was 600 degrees C and the casting was conducted with an argon-arc melting and pressure casting machine. Castability was evaluated by the volume of casting porosity, which was calculated from the volume of wax pattern (15 mm x 15 mm x 1.5 mm), the weight of cast plate and the specific density of pure titanium. The existence of inner casting porosities was confirmed by an X-ray non-destructive inspection instrument. Cast plates made in molds with cristobalite had significantly lower castability and higher surface hardness than those in molds with quartz as a refractory material. Cast plates in molds (quartz-cristobalite mixtures) with 20% binder had lower surface hardness and fewer casting porosities than those in molds with 10% binder.
authors.affiliation: Department of Dental Technology, Osaka University Faculty of Dentistry, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Takahashi
authors.forename: J Z
authors.initials: JZ
authors.lastname: Zhang
authors.forename: M
authors.initials: M
authors.lastname: Okazaki
mesh_terms: D000704:Analysis of Variance; D003734:Dental Casting Investment; D003735:Dental Casting Technique; D006244:Hardness; D010710:Phosphates; D016062:Porosity; D011791:Quartz; D012822:Silicon Dioxide; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
chemical_list: D003734:Dental Casting Investment; D010710:Phosphates; D011791:Quartz; D012822:Silicon Dioxide; D014025:Titanium