晶种增韧Sialon陶瓷材料的制备与性能研究  

PREPARATION AND CHARACTERIZATION OF SIALON CERAMICS REINFORCED WITH SEED CRYSTALS

作　　者：石现友[1] 陈涵[1] 郭露村[1] 

机构地区：[1]南京工业大学材料学院,南京210009

出　　处：《陶瓷学报》2010年第1期54-58,共5页Journal of Ceramics

基　　金：江苏江苏省科技成果转化专项资金项目(编号:BA2006049)

摘　　要：以无压烧结制备了α-Sialon晶种,研究了保温时间对晶种的长径比,以及晶种添加对Sialon材料烧结性能、力学性能和显微结构的影响。实验结果表明,晶种长径比随保温时间的延长而逐渐增加。晶种添加促进了基体材料内柱状晶的形成,明显提高了材料的强度和韧性,基体材料的最佳抗弯强度和断裂韧性达到636MPa和9.7MPa·m1/2,分别提高了13%和68%。High flexural strength and fracture toughness ceramics were prepared by adding elongated α-Sialon grains, which were synthesized by pressureless sintering. The effect of seed addition on the densification, mechanical properties, and microstructure development of the samples was investigated in details. Results showed that the addition of seed crystals can facilitate the growth of elongated grains, and promote the flexural strength and fracture toughness of the ceramics. Compared with matrix materials, the maximum fracture toughness and flexural strength are enhanced by 13% and 68%, respectively, which are up to 9.7MPa. m1/2 and 636MPa.

关 键 词：SIALON 晶种 断裂韧性 长径比 

分 类 号：TQ174.75[化学工程—陶瓷工业]