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ZrSi2-MgO as novel additives for high thermal conductivity of beta-Si3N4 ceramics
Wang, Weide; Yao, Dongxu; Chen, Huanbei; Xia, Yongfeng; Zuo, Kaihui; Yin, Jinwei; Liang, Hanqin; Zeng, Yu-Ping
2019-12-31
Source PublicationJOURNAL OF THE AMERICAN CERAMIC SOCIETY
ISSN0002-7820
SubtypeArticle; Early Access
AbstractA novel ZrSi2-MgO system was used as sintering additive for fabricating high thermal conductivity silicon nitride ceramics by gas pressure sintering at 1900 degrees C for 12 hours. By keeping the total amount of additives at 7 mol% and adjusting the amount of ZrSi2 in the range of 0-7 mol%, the effect of ZrSi2 addition on sintering behaviors and thermal conductivity of silicon nitride were investigated. It was found that binary additives ZrSi2-MgO were effective for the densification of Si3N4 ceramics. XRD observations demonstrated that ZrSi2 reacted with native silica on the Si3N4 surface to generate ZrO2 and beta-Si3N4 grains. TEM and in situ dilatometry confirmed that the as formed ZrO2 collaborated with MgO and Si3N4 to form Si-Zr-Mg-O-N liquid phase promoting the densification of Si3N4. Abnormal grain growth was promoted by in situ generated beta-Si3N4 grains. Consequently, compared to ZrO2-doped materials, the addition of ZrSi2 led to enlarged grains, extremely thin grain boundary film and high contiguity of Si3N4-Si3N4 grains. Ultimately, the thermal conductivity increased by 34.6% from 84.58 to 113.91 W center dot(m center dot K)(-1) when ZrO2 was substituted by ZrSi2.
Keywordsilicon nitride sintering thermal conductivity ZrSi2
DOI10.1111/jace.16902
WOS KeywordBONDED SILICON-NITRIDE ; SI3N4 CERAMICS ; MECHANICAL-PROPERTIES ; ELECTRICAL-PROPERTIES ; OXYGEN-CONTENT ; MICROSTRUCTURAL EVOLUTION ; FRACTURE-TOUGHNESS ; MGSIN2 ADDITION ; PARTICLE-SIZE ; FABRICATION
Language英语
WOS Research AreaMaterials Science
PublisherWILEY
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/27475
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Wang, Weide,Yao, Dongxu,Chen, Huanbei,et al. ZrSi2-MgO as novel additives for high thermal conductivity of beta-Si3N4 ceramics[J]. JOURNAL OF THE AMERICAN CERAMIC SOCIETY,2019.
APA Wang, Weide.,Yao, Dongxu.,Chen, Huanbei.,Xia, Yongfeng.,Zuo, Kaihui.,...&Zeng, Yu-Ping.(2019).ZrSi2-MgO as novel additives for high thermal conductivity of beta-Si3N4 ceramics.JOURNAL OF THE AMERICAN CERAMIC SOCIETY.
MLA Wang, Weide,et al."ZrSi2-MgO as novel additives for high thermal conductivity of beta-Si3N4 ceramics".JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2019).
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