Development of dental casting and porcelainizing techniques for titanium alloys
Casting of titanium metals has been difficult due to their high chemical reactivity at elevated temperatures. Thus, special melting and mold materials are needed. This study investigated molds, Ti alloys, and porcelain applications, utilizing a new dental casting machine, Castmatic. It involved argon-arc melting and subsequent argon/vacuum pressurized casting. Special refractory oxides such as yttria or Zirconia A were utilized for a face coat under phosphate bonded silica investment. Studies of Ti alloys (Ti, Ti-6Al-4V, Ti-15V, Ti-20Cu and Ti-30Pd) involved metallography, phase identification (XRD), hardness, tensile tests, and electrochemical-corrosion tests. Preliminary porcelain studies included an experimental low fusing porcelain along with commercial low fusing porcelains. The bond was evaluated by three-point bending tests and SEM/EDX observations. The yttria face coat was inert, but lacked the necessary mechanical and thermal stability. The face coat, consisting of Zirconia A and zirconium acetate binder, was stable and resulted in less mold reactivity, good internal soundness, but slightly rough surfaces. Metallographs revealed quite larger grains in the cast structure, than in the wrought forms. XRD analysis showed that quasi-equilibrium phases present.
- Research Organization:
- Northwestern Univ., Evanston, IL (USA)
- OSTI ID:
- 7225881
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
Similar Records
The effect of silica-containing binders on the titanium/face coat reaction
HIGH-STRENGTH LIGHTWEIGHT ENGINES FOR HEAVY-DUTY DIESEL TRUCKS
Related Subjects
ALUMINIUM ALLOYS
CASTING
COPPER ALLOYS
DENTISTRY
PALLADIUM ALLOYS
TITANIUM BASE ALLOYS
PROTECTIVE COATINGS
VANADIUM ALLOYS
YTTRIUM OXIDES
ZIRCONIUM OXIDES
CASTING MOLDS
REFRACTORIES
ALLOYS
CHALCOGENIDES
COATINGS
FABRICATION
MEDICINE
OXIDES
OXYGEN COMPOUNDS
PLATINUM METAL ALLOYS
TITANIUM ALLOYS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
ZIRCONIUM COMPOUNDS
360101* - Metals & Alloys- Preparation & Fabrication
360201 - Ceramics
Cermets
& Refractories- Preparation & Fabrication