GI-Ⅱ型着色玻璃渗透后渗透陶瓷的性能测试

目的 :探讨用GIⅡ型着色渗透玻璃渗透后的渗透陶瓷底层材料的热膨胀性能、机械力学性能和密度 ,为材料性能的改进和临床应用奠定基础。方法 :选用GIⅡ型着色渗透玻璃的IG2色玻璃料及GIⅡ型氧化铝粉体 ,制作氧化铝基体及渗透陶瓷样本 ,在TMA2940型热分析仪上绘制样本的热膨胀曲线 ,计算热膨胀系数 ;三点弯曲法测定渗透陶瓷材料的挠曲强度和弹性模量 ,显微压痕法测量断裂韧性和维氏硬度 ;重量体积法测定其密度。结果 :渗透陶瓷的热膨胀系数为 7.620×10(6)℃(-1)（2 5～ 5 0 0℃ ） ,略高于Vitaduralpha饰面瓷的热膨胀系数。材料的三点挠曲强度、弹性模量、维氏硬度、显微断裂韧性和密度分别为 389.6MPa、92GPa、9.409GPa、3.2425MNm3/2和3.662g/cm3 。结论 :用GIⅡ型着色渗透玻璃渗透后的渗透陶瓷底层材料 ,其热膨胀性能与Vitaduralpha饰面瓷匹配 ,机械强度也达到了临床应用的要求。

Properties of GI-ⅡGlass/Alumina Composite Infiltrated with GI-ⅡTinted Infiltration Glass

OBJECTIVE: The purpose of this study was to determine the thermal, mechanical properties and density of the composite infiltrated with GI-II tinted infiltration glass. METHODS: The bar-shaped aluminum oxide and glass/alumina composite specimens with the size of 20 mm x 5 mm x 5 mm were prepared, with two free-end surfaces perpendicular to the long axis of the specimens and parallel to each other. The thermal expansion curves were obtained on a TMA2940 thermal analyzer with heating rate of 5 degrees C/min and temperature range of 25 degrees C to 1000 degrees C. The bar-shaped specimens with the size of 25 mm x 5 mm x 2 mm were fabricated and employed to test the density using Archmede's method. The flexural strength, elastic modulus were measured by means of 3-point bending test with the same specimens. The fractured specimens were indented with Vicker's diamond pyramid under load of 49 N for 15 seconds to determine the hardness and indentation fracture toughness. RESULTS: The thermal expansion coefficient of the glass/alumina composite was 7.620 x 10(-6) degrees C-1 (25-500 degrees C), which was higher than that of Vitadur alpha veneering porcelain. The 3-poit flexural strength, elastic modulus, Vicker's hardness, indentation fracture toughness and density were 389.6 MPa, 92 GPa, 9.409 GPa, 3.2425 MNm-3/2 and 3.662 g/cm3 respectively. CONCLUSION: The thermal expansion of the GI-II glass/alumina composite is compatible with that of Vitadur alpha veneering porcelain, and the material could meet the strength demands for clinical use.