多孔Sialon 陶瓷的冷冻凝胶法制备与表征

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。

Fabrication and Characterization of Porous Sialon Ceramics byFreeze Casting Technique

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%.