可切削渗透陶瓷复合体试件断面的显微结构分析

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...

Microstructure analysis of the machinable infiltrated ceramic fracture surface

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.