GI-Ⅱ型着色玻璃渗透后渗透陶瓷的性能测试  

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

作　　者：韩晓莉 廖运茂[1] 巢永烈[1] 孟玉坤[1] 

机构地区：[1]四川大学华西口腔医学院,610041

出　　处：《华西口腔医学杂志》2002年第5期364-366,共3页West China Journal of Stomatology

基　　金：国家教委博士点基金资助项目 (编号 9845 )

摘　　要：目的 :探讨用GI_Ⅱ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GI_Ⅱ型着色渗透玻璃的IG2色玻璃料及GI_Ⅱ型氧化铝粉体 ,制作氧化铝基体及渗透陶瓷样本 ,在TMA2 940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 6 2 0× 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 40 9GPa、3 2 42 5MNm_3 / 2 和 3 6 6 2g/cm3 。结论 :用GI_Ⅱ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 。Objective:The purpose of this study was to determine the thermal, mechanical properties and density of the composite infiltrated with GI-Ⅱtinted infiltration glass.Methods: The bar-shaped aluminum oxide and glass/alumina composite specimens with the size of 20 mm×5 mm×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℃/min and temperature range of 25℃ to 1000℃. The bar-shaped specimens with the size of 25 mm×5 mm×2 mm were fabricated and employed to test the density using Archimede'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 7.620×10+{-6}℃+{-1}(25～500℃), 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/cm+3 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.

关 键 词：GI-Ⅱ型着色玻璃 渗透陶瓷 热膨胀 机械性能 全瓷冠桥修复体 

分 类 号：R783.2[医药卫生—口腔医学]