论文部分内容阅读
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。
In order to develop a porous alumina block that can be processed by dental computer-aided manufacturing technology and infiltrated by lanthanum borosilicate glass, the α-type high purity, ultrafine alumina powder is subjected to isostatic pressing to be sintered at 1350 ° C Into a porous alumina body, lanthanum borosilicate glass infiltration, making alumina glass composite, and its density, strength, fracture toughness were tested. The results show that the porous alumina has a density of 2.12g / cm3, a three-point bending strength of 102MPa, a fracture toughness of 1.61MPam1 / 2, an alumina glass composite bulk density of 3.85g / cm3, a three-point bending strength 385MPa, fracture toughness of 4.05MPam1 / 2. Scanning electron microscopy and X-ray energy spectrum analysis showed that the lanthanum borosilicate glass can fully penetrate the porous alumina body with a thickness of 3 mm after the heat treatment at 1150 ° C. for 6 hours. Suggest using this method to make alumina blocks to meet the clinical needs.