Effect of Nano-Al2O3 on Mechanical Properties and Microstructure of Al2O3/Si3N4 Compound Ceramics

被引：3

作者：

Hao, Shiming ^{[1
]}

Wang, Huifang ^{[2
]}

机构：

[1] Henan Univ Sci & Technol, Sch Phys & Engn, Luoyang, Peoples R China

[2] Henan Univ Sci & Technol, High Temp Mat Inst, Luoyang, Peoples R China

来源：

ADVANCES IN BUILDING MATERIALS, PTS 1-3 | 2011年 / 168-170卷

关键词：

Al2O3/Si3N4 compound ceramics; Pressureless sintering; Mechanical properties; Microstructure; Phase composition; FRACTURE-TOUGHNESS; SI3N4; SIALON; AL2O3;

D O I：

10.4028/www.scientific.net/AMR.168-170.1846

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The specimens of Al2O3/Si3N4 compound ceramics which contain 3%, 6%, 9%, 12%, 15%, and 18% nano-Al2O3 additions respectively were obtained by pressureless sintering at 1650 degrees C in the nitrogen atmosphere. The bending strength and fracture toughness (K-IC) were detected. The microstructure and phase composition of the specimens were analyzed by the means of SEM and X-ray. The results show that Al2O3/Si3N4 compound ceramics can be made only using pressureless sintering. With 9-12% nano-Al(2)O(3)addition, the specimens have the top mechanical properties. The bending strength reach 710.86MPa, K-IC reach 8.61MPa.M-1/2. These excellent properties come from many interwoven nitride distributed uniformly in the Al2O3/Si3N4 compound ceramics matrix, which composed of big and firmly plate-like beta-Si3N4, hexagonal Sialon and sheet Si2N2O.

引用

页码：1846 / +

页数：2

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