Effects of sintering aids on mechanical and dielectric properties of Si3N4 ceramics

被引：13
|
作者：
Zhao, D. L. [1 ]
Zhang, Y. J. [1 ]
Gong, H. Y. [1 ]
Nie, L. F. [1 ]
Zhao, L. [1 ]
机构：
[1] Shandong Univ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Minist Educ, Jinan 250061, Peoples R China
来源：
MATERIALS RESEARCH INNOVATIONS | 2010年 / 14卷 / 04期
关键词：
Si3N4; ceramics; Gas pressure sintering; Sintering aids; Dry gel of YAG; SILICON-NITRIDE; MICROSTRUCTURE; YB2O3; Y2O3;
D O I：
10.1179/143307510X12777574295424
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Si3N4 ceramics with different sintering aids are prepared by gas pressure sintering at 1800 degrees C under 8 MPa N-2 atmosphere. The mechanical and microwave dielectric properties of the Si3N4 ceramics with and without sintering aids are investigated. The results show that the sintering aids have a significant impact on the densification and mechanical properties of Si3N4 ceramics. Of all, the Si3N4 ceramics using the dry gel of yttrium aluminium garnet as sintering aids exhibit the maximum bending strength and fracture toughness, reaching 395 MPa and 4.25 MPa m(1/2) respectively. However, the dielectric properties of Si3N4 ceramics are similar to that using the other two sintering aids. The improved mechanical properties of the Si3N4 ceramics are attributed to the formation of rod-like beta-Si3N4 particles.
引用
收藏
页码：338 / 341
页数：4
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