无机材料学报

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添加β-Si3N4棒晶对氮化硅陶瓷力学性能的影响

陈殿营; 张宝林; 庄汉锐; 李文兰   

  1. 中国科学院上海硅酸盐研究所 上海 200050
  • 收稿日期:2002-08-19 修回日期:2002-09-20 出版日期:2003-09-20 网络出版日期:2003-09-20

Effects of Seeding with β-Si3N4 Rod Crystals on Mechanical Properties of Silicon Nitride Ceramics

CHEN Dian-Ying; ZHANG Bao-Lin; ZHUANG Han-Rui; LI Wen-Lan   

  1. Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China
  • Received:2002-08-19 Revised:2002-09-20 Published:2003-09-20 Online:2003-09-20

摘要: 将由自蔓延燃烧合成法制备的β—Si3N4棒晶加入到α-Si3N4起始原料中,研究了热压烧结氮化硅陶瓷力学性能的变化.随棒晶添加量的增加,材料的韧性提高,抗弯曲强度下降.与不加棒晶相比,加入8wt%的β-Si3N4棒晶可使陶瓷的韧性从4.0MPa·m1/2提高到6.7MPa·m1/2.断口形貌和压痕裂纹的显微结构观察表明,韧性的提高源于长柱状晶粒的拔出和裂纹的偏转.

关键词: β-Si3N4棒晶, 氮化硅, 断裂韧性

Abstract: In this paper, the effects of seeding β-Si3N4 rod crystals prepared by self-propagating high-temperature synthesis on the mechanical
properties of silicon nitride ceramic were investigated. The experimental results showed that with the increase of β-Si3N4 rod crystals
content, the fracture toughness increases, while the flexile strength decreases. The fracture toughness can increase from 4.0MPa·m1/2
to 6.7MPa·m1/2 when 8wt%β-Si3N4 rod crystal was added compared with that without seeding. The improvement of fracture
toughness results from the grain pullout and bridging, branching of elongated grains.

Key words: β-Si3N4 rod crystals, silicon nitride, fracture toughness

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