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OALib Journal期刊
ISSN: 2333-9721
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RE-Si-Al-O-N (RE=Y或Lu)连接Si3N4陶瓷接头的微观组织与性能
DOI: 10.14062/j.issn.0454-5648.2015.03.05
Abstract:
通过添加稀土Y或Lu，设计Si3N4–Al2O3–RE2O3–SiO2(RE-Si-Al-O-N，RE=Y或Lu)混合粉末焊料，原位形成以RE-Si-Al氧氮玻璃为中间层的氮化硅陶瓷接头。研究了连接过程中陶瓷接头微观组织与性能随连接温度、保温时间、稀土类型的变化，并分析了接头高温氧化行为。结果表明，采用Y-Si-Al-O-N焊料时，保温时间延长有利于接头内组织均匀化、焊缝致密化及焊料与母材间的相互扩散，形成良好连接。接头强度随保温时间延长先升高后降低，保温30min时，接头强度出现峰值(218MPa)。接头经1200℃氧化20h后仍保持原始强度的82%。采用Lu-Si-Al-O-N玻璃连接氮化硅，随连接温度升高，焊缝致密化程度提高，b-sialon相增加，连接强度呈现升高趋势。
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