Oliveira Pedro César Garcia, Adabo Gelson Luis, Ribeiro Ricardo Faria, da Rocha Sicknan Soares, Avila Fabiano Araújo, do Valle Accácio Lins
Departament of Prosthodontics, Bauru School of Dentistry, University of São Paulo, Bauru, SP.
J Appl Oral Sci. 2007 Feb;15(1):44-8. doi: 10.1590/s1678-77572007000100010.
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, fifteen to the CP Titanium and fifteen to the Ti-6Al-4V alloy, five samples to each an of the three temperatures of investment: 430 degrees C (control group), 480 degrees C and 530 degrees 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 strength test the specimens were sectioned, embedded and polished to hardness measurements, using a Vickers tester, Micromet 2100. The means values to tensile tests to the temperatures 430 degrees 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 Test that indicate differences significant only between the materials, but not between the temperature, for both the materials. It was concluded 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.
这项工作的目的是评估包埋材料加热温度对纯钛（CP Ti）和Ti-6Al-4V合金铸件拉伸强度及维氏硬度的影响。通过在Rematitan Plus包埋材料中包埋并在Discovery机器上铸造，获得用于拉伸强度测试的哑铃形试棒。共获得30个试样，其中15个为纯钛试样，15个为Ti-6Al-4V合金试样，每种合金针对包埋材料的三个温度（430℃（对照组）、480℃和530℃）各制备5个样本。拉伸试验通过MTS 810型万能试验机进行，应变速率为1.0 mm/min。拉伸强度测试后，将试样切片、镶嵌并抛光，以便使用Micromet 2100维氏硬度计进行硬度测量。430℃、480℃和530℃温度下的拉伸试验平均值：纯钛（486.1 - 501.16 - 498.14 - 平均值495.30 MPa）和Ti-6Al-4V合金（961.33 - 958.26 - 1005.80 - 平均值975.13 MPa），而维氏硬度值分别为（198.06、197.85、202.58 - 平均值199.50）和（352.95、339.36、344.76 - 平均值345.69）。对这些值进行方差分析（ANOVA）和Tukey检验，结果表明，对于这两种材料，仅材料之间存在显著差异，温度之间无显著差异。得出的结论是，包埋材料温度的升高不会改变纯钛和Ti-6Al-4V合金的拉伸强度及维氏硬度。
