高气孔、高强Si_3N_4陶瓷材料的研究  

Fabrication of Si_3N_4 Ceramics with High Porosity and High Strength

作　　者：张晓霞[1] 山玉波[1,2] 张伟儒[2] 李伶[2] 殷盼盼[1] 

机构地区：[1]沈阳建筑大学交通与机械学院,辽宁沈阳100168 [2]山东工业陶瓷研究设计院,山东淄博255031

出　　处：《稀有金属材料与工程》2008年第A01期713-716,共4页Rare Metal Materials and Engineering

基　　金：国家863计划项目(2002AA305510);辽宁省教育科学基金(05L356);辽宁省自然科学基金(20042002)

摘　　要：采用部分烧结工艺,利用复合助剂A作为烧结助剂,成功的制备出了材质比较均匀且有较高强度、高气孔氮化硅陶瓷。借助XRD、SEM等仪器对其物相组成和微观结构进行了研究。实验结果表明:在适当的工艺下可以制得弯曲强度大于160 MPa,气孔率>50%的多孔氮化硅陶瓷。气孔主要是由长柱状β-Si_3N_4晶粒搭接而成的,均匀的气孔分布和高的长径比结构是获得高强度的主要原因。Porous Si3N4 ceramics with high porosity and relatively high strength were obtained by partial sintering using sintering additives. The composition and microstructure of the ceramics were studied by scanning electron microscopy （SEM） and X-ray diffraction （XRD）. Results showed porous SiaN4 ceramics with the strength greater than 160 MPa and the porosity above 55% could be obtained. The pores were generated by the pillar structure ofβ -Si3N4 grains, and the pores distributed uniformly which attributed to the high mechanical performances of the porous ceramics.

关 键 词：部分烧结 气孔率 弯曲强度 氮化硅 

分 类 号：TQ174.6[化学工程—陶瓷工业]