华西口腔医学杂志

• 基础研究 • 上一篇    下一篇

GI-Ⅱ型渗透陶瓷氧化铝粉体的研究

王航,巢永烈,廖运茂,朱智敏,巢齐宇,梁星   

  1. 610041 四川大学华西口腔医学院
  • 收稿日期:2002-06-25 修回日期:2002-06-25 出版日期:2002-06-20 发布日期:2002-06-20
  • 基金资助:
    本课题为四川省卫生厅科研基金资助项目(编号970106)

A Study of Alumina Powder Used in Fabrication of GI-ⅡInfiltrated Ceramic

Wang Hang, Chao Yonglie, Liao Yunmao, et al   

  1. West China College ofStomatology, Sichuan University
  • Received:2002-06-25 Revised:2002-06-25 Online:2002-06-20 Published:2002-06-20

摘要:

目的:研究GI-Ⅱ型渗透陶瓷氧化铝粉体和坯体的特征,分析其形成氧化铝多孔结构的机制。方法:X衍射分析氧化铝粉体的晶型,粒度分析仪测试其粒度组成,扫描电镜观察坯体的微观结构。结果:氧化铝晶体是结构最紧密、最稳定的纯A型氧化铝晶型。氧化铝粉体中小于015Lm的细颗粒占9 wt%,粗颗粒集中在115~315Lm,占 75 wt%。扫描电镜观察坯体断面发现许多细小的颗粒均匀地附着在大颗粒表面,大小颗粒分散均匀,堆积较为密实。结论:氧化铝的晶型、粒度分布、颗粒分散,有利于形成多孔可渗透氧化铝骨架,是GI-Ⅱ型渗透陶瓷预制体的材料基础,也是复合体强度提高的关键。

关键词: 牙科陶瓷, 渗透陶瓷, 氧化铝, 多孔结构

Abstract:

Objective:This investigationwas to analyze the mechanism of formation of porous structure by studying some characteristics of the alumina powder used forGI-ⅡInfiltrate Ceramic.Methods:The alumina powder crystal type was analyzed with X-diffractome- ter, and its size distributionwas obtained by powder size analysis device, and fracture surface of alumina adobe was observed under scanning electronic microscope.Results:Alumina crystalswere purelyAtype, with firmest structure and best stability. Fine pow- derwhose size was smaller than 015Lm occupied 9 wt% (mass) and, coarse powder with sizes between 1 to 315Lm occupied 75wt% (mass). The SEM graphs of adobe showed that fine powders were attached to the surface of coarse powders, dispersed evenly, and alumina powders contacted each other firmly.Conclusion:The crystal type, size distribution and even dispersion of the studied alumina powder contributed to the formation of porous structure of alumina sintered body (preform), whichwas the ma- terial prerequisite in forming porous preform and one of the key factors to the rise of strength of GI-ⅡInfiltrated Ceramic.

Key words: dentalmaterial, infiltratedceramic, alumina, porousstructure