Abstract
The aim of the work was to evaluate the influence of the temperature of investment healting on the tensile strength and Vickers hardness of CP Ti and Ti-6Al-4V alloy casting. Were obtained for the tensile strength test dumbbell rods that were invested in the Rematitan Plus investment and casting in the Discovery machine cast. Thirty specimens were obtained, fiftten to the CP Titanium and fifteen to the Ti-6Al-4V alloy, five samples to each an of the three temperatures of investment: 430°C (control group), 480°C and 530°C. The tensile test was measured by means of a universal testing machine, MTS model 810, at a strain of 1.0 mm/min. After the tensile strenght test the specimens were secctioned, embedded and polished to hardness measurements, using a Vickers tester, Micromet 2100. The means values to tensile tests to the temperatures 430°C, 480 and 530: CP Ti (486.1 – 501.16 – 498.14 –mean 495.30 MPa) and Ti-6Al-4V alloy (961.33 – 958.26 – 1005.80 – mean 975.13 MPa) while for the Vickers hardness the values were (198.06, 197.85, 202.58 – mean 199.50) and (352.95, 339.36, 344.76 – mean 345.69), respectively. The values were submitted to Analysis of Variance (ANOVA) and Tukey,s Test that indicate differences significant only between the materials, but not between the temperature, for both the materias. It was conclued that increase of the temperature of investment its not chance the tensile strength and the Vickers hardness of the CP Titanium and Ti-6Al-4V alloy.
Highlights
Titanium (Ti) and its alloys are increasingly being used in dental applications, such as implants and restorative castings, present as positive characteristics an excellent resistance to the corrosion[9], low thermal conductivity[4], elastic modulus and ductility similar to the golden alloys[7], besides low density (4,5 g/cm3) when compared to other alloys as Co-Cr (8,9 g/cm3) and Gold (19,3 g/cm3)[5]
Considering that the increase of the temperature can improve the castability and, on the other hand, it can increase the reactivity of the titanium with the investment to the sílica base, the objective of the work was to evaluate small increases of the temperature of the investment will influence the tensile strength and the Vickers hardness of the CP Ti and Ti-6Al-4V alloy
The variance analyses for the resistance data to the tensile strength and Vickers hardness (Tables 3 and 4) demonstrated there to be significant differences just among the materials
Summary
Titanium (Ti) and its alloys are increasingly being used in dental applications, such as implants and restorative castings, present as positive characteristics an excellent resistance to the corrosion[9], low thermal conductivity[4], elastic modulus and ductility similar to the golden alloys[7], besides low density (4,5 g/cm3) when compared to other alloys as Co-Cr (8,9 g/cm3) and Gold (19,3 g/cm3)[5]. Silica-based investment is more accessible and have been used for casting of titanium. The reaction layer increases in direct proportion with the temperature of the mold in the moment of the injection of the metal, due to the great reactivity of the silica with the titanium, in temperatures above 600oC14. The castability of the titanium is very low, difficulting the completion of the mold in the moment of the casting, due to the low density, to the difference between the casting temperature of the metal (1700oC) and of the investment, that varies between to room temperature and 600oC
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