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.
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.
参考文献
| [1] | |
| [2] | Hoffmann M J, Petzow G.“Microstructure Design of Si3N4 Based Ceramics” |
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