纳米氧化铝玻璃复合体强度及断裂韧性的研究

Research on Bending Strength and Fracture Toughness of Alumina glass Composite

为了研制出一种能被牙科计算机辅助制作技术加工并能被镧硼硅玻璃渗透的多孔氧化铝块，采用α型高纯度、超细氧化铝粉末，经等静压处理，在１３５０℃下烧结成多孔氧化铝坯体，经镧硼硅玻璃渗透，制作氧化铝玻璃复合体，并对其密度、强度、断裂韧性进行测试。结果显示：多孔氧化铝坯体密度为２．１２ｇ／ｃｍ３，三点弯曲强度为１０２ＭＰａ，断裂韧性为１．６１ＭＰａｍ１／２，氧化铝玻璃复合体体积密度为３．８５ｇ／ｃｍ３，三点弯曲强度为３８５ＭＰａ，断裂韧性为４．０５ＭＰａｍ１／２。扫描电镜及Ｘ线能谱分析表明，镧硼硅玻璃在经１１５０℃保持６小时热处理后，能够完全渗透厚３ｍｍ的多孔氧化铝坯体。提示用这种方法制作的氧化铝块可以满足临床的需要。

To develop a new ceramic material that can be machined and infiltrated with glass, a porous alumina blank sintered at 1350℃ was made of high purity, super fine α alumina and then infiltrated with glass in this study. The density, bending strength and fracture toughness of the partially sintered alumina and alumina glass composite were determined. The results indicated that the porous alumina density was 2.12g/cm 3, the three point bending strength 102MPa, the fracture toughness 1 61 MPam 1/2 ; that the alumi na glass composite density was 3.85g/cm 3, the three point bending strength 385MPa, and the fracture toughness 4 05 MPam 1/2 . By SEM and EDXA analysis, lanthanum boroslicate glass was completely infiltrated into the 3mm thick porous alumina blank for 6h at 1150℃. These suggest that the new developed alumina blank is suited for clinical use.