title: Mechanical properties and grindability of dental cast Ti-Nb alloys.
abstract: Aiming at developing a dental titanium alloy with better mechanical properties and machinability than unalloyed titanium, a series of Ti-Nb alloys with Nb concentrations up to 30% was made. They were cast into magnesia-based molds using a dental casting machine and the mechanical properties and grindability of the castings were examined. The hardness of the alloys with Nb concentrations of 5% and above was significantly higher than that of titanium. The yield strength and tensile strength of the alloys with Nb concentrations of 10% and above were significantly higher than those of titanium, while the elongation was significantly lower. A small addition of niobium to titanium did not contribute to improving the grindability of titanium. The Ti-30% Nb alloy exhibited significantly better grindability at low grinding speed with higher hardness, strength, and Young's modulus than titanium, presumably due to precipitation of the omega phase in the beta matrix.
authors: Division of Dental Biomaterials, Graduate School of Dentistry, Tohoku University 4-1, Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8575 Japan.
authors: Masafumi
authors: M
authors: Kikuchi
authors: Masatoshi
authors: M
authors: Takahashi
authors: Osamu
authors: O
authors: Okuno
mesh_terms: D003722:Dental Alloys / Q000737:chemistry*; D003735:Dental Casting Technique; D004548:Elasticity; D006244:Hardness; D006801:Humans; D008422:Materials Testing; D019563:Mechanics; D009556:Niobium / Q000737:chemistry*; D044367:Phase Transition; D013499:Surface Properties; D013718:Tensile Strength; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D003722:Dental Alloys; D009556:Niobium; D014025:Titanium