凝胶注模成型制备微多孔氮化硅陶瓷  

Investigation of Gel Casting Preparation of Micro-Porous Si_3N_4 Ceramics

作　　者：余娟丽[1] 王红洁[1] 张健[2] 张大海[2] 

机构地区：[1]西安交通大学金属材料强度国家实验室,陕西西安710049 [2]航天材料及工艺研究所先进功能复合材料技术国防科技重点实验室,北京100076

出　　处：《稀有金属材料与工程》2009年第A02期340-343,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(90816018);武器装备预研基金(9140C5602040805);"973"项目(2006CB601201);西安市工业攻关计划(cxy08006(1)

摘　　要：采用凝胶注模法,在无其它添加剂的条件下,通过提高单体含量,成功制备出高性能微多孔氮化硅陶瓷,陶瓷抗弯强度高达137MPa以上,气孔率高达50%以上,孔中径小于1μm。结果表明:随着有机单体含量的增加,氮化硅微多孔陶瓷气孔率单调增加;随着固含量的增大,氮化硅微多孔陶瓷气孔率单调下降,抗弯强度先上升然后又下降,固含量有一优化值,此时陶瓷体抗弯强度最大;随着烧结温度的增加,氮化硅陶瓷强度单调增加,而气孔率单调下降。Gel casting preparation of porous Si3N4 ceramics by merely increasing monomer content in the slurry without other organic additives was investigated. High performance porous Si3N4 ceramics were obtained, and the flexural strength and porosity were over 137 MPa and over 50%, respectively. The median pore diameter of porous Si3N4 ceramics is less 1μm. The experimental results shows that： increasing monomer content makes the porosity of porous Si3N4 ceramics monotonically increase; the porosity of porous Si3N4 ceramics monotonically decreased with increasing solid loading, and the solid loading had an optimum value for the flexural strength which achieved maximum strength; with sintering temperature, the flexural strength monotonically increases, but the porosity monotonically decreases.

关 键 词：凝胶注模 微多孔氮化硅陶瓷 强度 气孔率 

分 类 号：TQ174.758.12[化学工程—陶瓷工业]