Dependence of Yb2O3/SiO2 molar ratio on high-temperature characteristics of gas pressure sintered Si3N4

被引：8

作者：

Yamamoto, H

Akiyama, K

Hirata, T

Murakami, Y

机构：

[1] Mitsubishi Heavy Ind Co Ltd, Nagasaki Res & Dev Ctr, Nagasaki 8510392, Japan

[2] Mitsubishi Heavy Ind Co Ltd, Adv Technol Res Ctr, Kanazawa Ku, Yokohama, Kanagawa 2368515, Japan

[3] Mitsubishi Heavy Ind Co Ltd, Yokohama Res & Dev Ctr, Naka Ku, Yokohama, Kanagawa 2318715, Japan

来源：

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN | 2005年 / 113卷 / 1316期

关键词：

silicon nitride; high-temperature strength; grain-boundary phase;

D O I：

10.2109/jcersj.113.325

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

High-temperature characteristics (especially high-temperature strength and oxidation resistance) of gas pressure sintered Si3N4 ceramics using Yb2O3-SiO2 additives were evaluated. The high temperature characteristic of Si3N4 depended on the Yb2O3/SiO2 molar ratio of additives. High 1500 degrees C bending strength of 395 MPa was obtained for sintered bodies with 10.0 mass% addition of additives with Yb2O3/SiO2 molar ratio of 1.0. Also, small weight change (13.2 g/m(2)) during oxidation at 1300 degrees C for 300 h was obtained in this sintered body. This is considered to be due to the precipitation of Yb4Si2N2O7 and Yb2Si2O7 phase in the grain boundary glass phase, as induced by a crystallization process.

引用

页码：325 / 329

页数：5

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