时效对云母/环氧复合材料组织演变、热性能和力学性能的影响

1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319) Pub Date : 1999-10-17 DOI:10.1109/CEIDP.1999.807861

Hee-Dong Kim, Y. Ju, H. Rhew

{"title":"时效对云母/环氧复合材料组织演变、热性能和力学性能的影响","authors":"Hee-Dong Kim, Y. Ju, H. Rhew","doi":"10.1109/CEIDP.1999.807861","DOIUrl":null,"url":null,"abstract":"The mica/epoxy composite used in generator (rated 22 KV and 560 MVA) stator windings was exposed under air or hydrogen atmosphere at 180/spl deg/C for 1000 hours. The measurements of glass transition temperature and storage modulus were conducted using differential scanning calorimeter (DSC) and dynamic mechanical analyzer (DMA). The defect evolution was investigated by scanning electron microscope (SEM) in control and aged specimens. The SEM microstructural analysis showed that the degradation occurred fast aged specimens in air as the size of cavities increases at the mica/epoxy interface. The aged specimens in hydrogen showed retarded generation and growth of cavities. All specimen showed cavities and cracks at the mica/epoxy interface. Which could cause premature failure. The microstructural analysis indicates that reducing defect formation in operation would greatly extend the lifetime of mica/epoxy composite.","PeriodicalId":267509,"journal":{"name":"1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1999-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"5","resultStr":"{\"title\":\"Effect of aging on the microstructure evolution, thermal and mechanical properties of mica/epoxy composite\",\"authors\":\"Hee-Dong Kim, Y. Ju, H. Rhew\",\"doi\":\"10.1109/CEIDP.1999.807861\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The mica/epoxy composite used in generator (rated 22 KV and 560 MVA) stator windings was exposed under air or hydrogen atmosphere at 180/spl deg/C for 1000 hours. The measurements of glass transition temperature and storage modulus were conducted using differential scanning calorimeter (DSC) and dynamic mechanical analyzer (DMA). The defect evolution was investigated by scanning electron microscope (SEM) in control and aged specimens. The SEM microstructural analysis showed that the degradation occurred fast aged specimens in air as the size of cavities increases at the mica/epoxy interface. The aged specimens in hydrogen showed retarded generation and growth of cavities. All specimen showed cavities and cracks at the mica/epoxy interface. Which could cause premature failure. The microstructural analysis indicates that reducing defect formation in operation would greatly extend the lifetime of mica/epoxy composite.\",\"PeriodicalId\":267509,\"journal\":{\"name\":\"1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319)\",\"volume\":\"1 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1999-10-17\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"5\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319)\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/CEIDP.1999.807861\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/CEIDP.1999.807861","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}

引用次数: 5

摘要

将用于发电机(额定22kv和560mva)定子绕组的云母/环氧复合材料在180度/spl℃的空气或氢气气氛下暴露1000小时。采用差示扫描量热仪(DSC)和动态力学分析仪(DMA)测量了玻璃化转变温度和存储模量。用扫描电镜观察了控制试样和时效试样的缺陷演变过程。SEM微观结构分析表明，随着云母/环氧树脂界面空腔尺寸的增大，空气中快时效试样发生降解。经氢处理的老化试样，空腔的产生和生长迟缓。所有试样均在云母/环氧树脂界面处出现空洞和裂纹。这可能会导致过早失效。显微组织分析表明，减少使用过程中缺陷的形成将大大延长云母/环氧复合材料的使用寿命。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

查看原文本刊更多论文

Effect of aging on the microstructure evolution, thermal and mechanical properties of mica/epoxy composite

The mica/epoxy composite used in generator (rated 22 KV and 560 MVA) stator windings was exposed under air or hydrogen atmosphere at 180/spl deg/C for 1000 hours. The measurements of glass transition temperature and storage modulus were conducted using differential scanning calorimeter (DSC) and dynamic mechanical analyzer (DMA). The defect evolution was investigated by scanning electron microscope (SEM) in control and aged specimens. The SEM microstructural analysis showed that the degradation occurred fast aged specimens in air as the size of cavities increases at the mica/epoxy interface. The aged specimens in hydrogen showed retarded generation and growth of cavities. All specimen showed cavities and cracks at the mica/epoxy interface. Which could cause premature failure. The microstructural analysis indicates that reducing defect formation in operation would greatly extend the lifetime of mica/epoxy composite.

求助全文

通过发布文献求助，成功后即可免费获取论文全文。去求助

来源期刊

1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319)

自引率

0.00%

发文量