采用凝胶注模成型工艺,成功地制备了具有高强度、结构比较均匀并有较高气孔率的氮化硅多孔陶瓷。本文研究了制得的多孔氮化硅的力学性能和微观结构,并讨论了获得高性能的原因。结果表明,采用适当的成型条件可制备出结构均匀、强度高、加工性能优良的坯体,烧成的多孔氮化硅陶瓷强度均>150MPa,气孔率>50％。SEM照片显示气孔是由长柱状β-Si3N4晶搭接而成的。均匀的气孔分布和柱晶结构是获得高性能的主要原因。
Porous Si3N4 ceramics with high strength, uniform structure and relative high porosity were
obtained by gelcasting. The mechanical performances and micro-structure of the porous Si3N4 ceramics were studied and the reasons were
discussed. It was showed that using proper techniques, green bodies with high strength, uniform structure and good machining proparey
could be got. Results show that the sintered porous Si3N4 ceramics have strength more than 150MPa and porosity up to 50%. SEM shows that porous are formed
by the banding-up of pillar β-Si3N4. The uniform porous distribution and pillar structure are the main reasons for good mechanical performances.
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