多孔Sialon陶瓷的冷冻凝胶法制备与表征  

Fabrication and Characterization of Porous Sialon Ceramics by Freeze Casting Technique

作　　者：王涛[1] 余娟丽[1] 吕毅[1] 郭世峰[1] 裴雨辰[1] 

机构地区：[1]航天特种材料及工艺技术研究所,北京100074

出　　处：《宇航材料工艺》2015年第4期43-46,共4页Aerospace Materials & Technology

摘　　要：采用冷冻凝胶成型和无压烧结工艺制备了多孔Sialon陶瓷材料,通过X射线衍射分析了材料的晶相组成,观察了材料的显微结构形貌,测试了材料的弯曲强度和介电常数。结果表明:z值影响材料的晶相组成,浆料的固相体积分数影响材料的性能,当z=2.5,固相体积分数为60%时,材料的弯曲强度达到116MPa,介电常数为4.79。Porous sialon ceramics was fabricated by freeze casting technique and pressureless sitering process.Crystalline phases of the as-sintered specimens were identified by X- ray diffraction（ XRD）. Microstructures were examined by scanning electron microscopy（ SEM）. Mechanical and dielectric properties of the material were investigated. The crystalline phases and properties are influenced by z value in initial compositions and solids loading of the slurries. The flexural strength and dielectric constant reach 116 MPa and 4. 79,respectively,with z = 2. 5 and solid loading of 60vol%.

关 键 词：冷冻成型 SIALON XRD SEM 

分 类 号：TQ127.2[化学工程—无机化工]