华西口腔医学杂志

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可切削渗透陶瓷复合体试件断面的显微结构分析

杨晓喻1 王华英1 雷欣1 廖运茂2 鲜苏琴2 刘长虹1   

  1. 1.广东省口腔医院·南方医科大学附属口腔医院种植中心, 广州510280;2.口腔疾病研究国家重点实验室, 四川大学, 成都610041
  • 收稿日期:2011-12-25 修回日期:2011-12-25 出版日期:2011-12-20 发布日期:2011-12-20
  • 通讯作者: 刘长虹,Tel:020-84408890
  • 作者简介:杨晓喻(1974—),女,四川人,主任医师,博士
  • 基金资助:

    广东省医学科学技术研究基金资助项目(A2009102)

Microstructure analysis of the machinable infiltrated ceramic fracture surface

Yang Xiaoyu1, Wang Huaying1, Lei Xin1, Liao Yunmao2, Xian Suqin2, Liu Changhong1   

  1. 1. Implantology Center, Guangdong Provincial Stomatological ospital, Southern Medical University, Guangzhou 510280, China; 2. State Key Laboratory of Oral Diseases, Sichuan niversity, Chengdu 610041, China
  • Received:2011-12-25 Revised:2011-12-25 Online:2011-12-20 Published:2011-12-20
  • Contact: Liu Changhong,Tel:020-84408890

摘要:

目的比较不同制备条件下形成的可切削渗透陶瓷(MIC)复合体断面显微结构,从显微结构层面提供与陶瓷强度相关的证据。方法制备氧化铝基体,将可切削渗透云母玻璃渗透其中并晶化,根据烧结时间和渗透时间制备条件的不同分为:充分烧结渗透组、烧结时间不足组和渗透时间不足组。制作试件,测定其三点弯曲强度及弹性模量,并在扫描电镜下观察复合体断面。结果渗透时间不足组及烧结时间不足组的三点弯曲强度及弹性模量均低于充分烧结渗透组,并可在断面显微结构上找到典型的结构缺陷。氧化铝中玻璃渗透锋面和玻璃与氧化铝复合体界面分析显示:未渗透玻璃的氧化铝基体断面较已渗透的复合体断面整齐;单一玻璃内部有大而长的裂纹,复合体内则没有。结论足够的烧结和渗透时间是保证MIC材料均一性和强度的关键。

关键词: 可切削渗透陶瓷, 强度, 显微结构

Abstract:

Objective To compare the fracture surface of the machinable infiltrated ceramic(MIC) prepared in different onditions, and to relate its strength and toughness to the differences in their microstructures. Methods The Al2O3 atrix were prepared, infiltrated by the machinable glass and crystallized. Based on sintering and infiltrating time and onditions, the specimens were divided into three groups: Perfect group, insufficiently infiltrated group, mal-sintered substrate roup. Specimens were fabricated, three point flexural strength and elastic modulus were tested, and the microstructure f the MIC fracture surfaces was analyzed by means of scanning electron micrograph(SEM) observation. Results he strength of the insufficiently infiltrated group and mal-sintered substrate group were lower than that of the perfect roup, and faults in the microstructure of these two groups also proved this. The foreland of glass infiltrating in the Al2O3 nd the interface of glass and complex demonstrated that the Al2O3 surface was smoother than the complex and there as a big crack in the glass but not in the complex which proved the crack resistibility of glass and Al2O3 were smaller han that of the complex(MIC). Conclusion Correct preparing process could make the glass infiltrate into properly sintered l2O3 sufficiently which ensured best mechanical properties of the complex.

Key words: machinable infiltrated ceramic, strength, microstructure