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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/16591

Title: Low melting ternary titanium casting alloys.
Authors: Al-Jabab, A.
Greener, E.
Lautenschlager, E.
Keywords: Low melting; ternary; titanium; casting alloys
Issue Date: 1994
Publisher: Saudi Dental Society
Citation: Saudi Dental Journal; 6(SI): Abstract-013
Abstract: Pure titanium metal has a great potential in dentistry. Its high melting point (1670oC) and reactivity with surrounding oxygen and investment material makes it very difficult to cast accurately. Since the reactivity of molten Ti with oxygen is a direct function of temperature, casts problems could be alleviated if a useful Ti-alloys, with a significantly lower casting temperature (110OoC) were available. The objective of this work was to develop six different new low melting ternary (LMT) x Ti-yAG-zCu alloys (x = 50 or 60, y = 40 to 10, z = 10 - to 30) and evaluate: melting point, density and hardness of, as prepared LMT, Ti-alloy ingots. Microstructures and phase identification using optical, SEM/EDS and X-ray diffraction. Corrosion resistance using polarization hysteresis and atomic absorption spectroscopy. Castability, goodness of fit, mechanical properties and reactivity with investments. Results showed that all LMT Ti-alloys were found to have significantly lower melting temperature, and higher densities than pure Ti. Phase identification analysis shows intermetallic compounds' structure were found in all LMT Ti-alloys. Alloys containing 60 wt.% Ti were found to have spontaneous passivation comparable to pure Ti. Metal release results agree with the electrochemical results. The total cation release of all three elements in the worst conditions did not exceed 2.5 ug/cm2 after six months of storage time. Casting of the (60Ti-yAG-zCu) alloys exceed pure Ti in castability and can produce marginal fit comparable to pure Ti with better marginal fit than the most commonly used dental alloys, Rexillium III and Austena-37. LMT Ti-alloys were found to be less reactive with the conventional dental phosphate bonded silica investment (RemaE) that pure Ti. Microhardness of LMT Ti-alloys were constant from the outermost mold-metal interface surface to the center of the cross-section. Tensile strength and ductility of the LMT Ti-alloys were significantly reduced from those of pure Ti but were equivalent to other dental alloys. In conclusion (60Ti-yAG-zCu) alloys have excellent castability, chemical and acceptable mechanical properties that give them a great potential for future use as dental alloys.
URI: http://hdl.handle.net/123456789/16591
ISSN: 1013-9052
Appears in Collections:College of Dentistry

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