HOT-PRESSED SILICON NITRIDE CERAMICS WITH RARE-EARTH OXIDE ADDITIVES

被引：0
|
作者：
徐友仁
黄莉萍
符锡仁
严东生
机构：
[1] Acadcmia Sinica
[2] Shanghai Institute of Ceramics
来源：
Science China Mathematics | 1985年 / 05期
关键词：
OC; HOT-PRESSED SILICON NITRIDE CERAMICS WITH RARE-EARTH OXIDE ADDITIVES;
D O I：
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学科分类号：
摘要：
A hot-pressed silicon nitride ceramic material with rare-earth oxide additives has been processed. Its bend strength maintains 800—900 Mpa up to 1300℃ and measures 680 Mpa at 1400℃, its fracture toughness at room temperature is 4.38—4.96 mPa mX-ray, SEM, EDS and electron probe analyses reveal that the microstructure of this material is composed of fine β-SiNgrains, α-SiNwhiskers, small tetragonal lanthanide crystals and La-containing glassy phase. Observation on fracture surface shows that the fracture path is mainly transcrystalline up to 1400℃. The effects of additives on strength and fracture toughness of HPSN obtained are also discussed,
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页码：556 / 560
页数：5
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