Plastic deformation and effects of water in room‐temperature cold sintering of NaCl microwave dielectric ceramics

Journal of the American Ceramic SocietyVolume 101, Issue 9 p. 4038-4043 ORIGINAL ARTICLE Plastic deformation and effects of water in room-temperature cold sintering of NaCl microwave dielectric ceramics Wen Bin Hong, Wen Bin Hong Laboratory of Dielectric Materials, School of Materials Science & Engineering, Zhejiang University, Hangzhou, ChinaSearch for more papers by this authorLei Li, Corresponding Author Lei Li zjulilei@zju.edu.cn orcid.org/0000-0002-6794-8459 Laboratory of Dielectric Materials, School of Materials Science & Engineering, Zhejiang University, Hangzhou, China Correspondence Lei Li, Laboratory of Dielectric Materials, School of Materials Science & Engineering, Zhejiang University, Hangzhou, China. Email: zjulilei@zju.edu.cn.Search for more papers by this authorMeng Cao, Meng Cao Laboratory of Dielectric Materials, School of Materials Science & Engineering, Zhejiang University, Hangzhou, ChinaSearch for more papers by this authorXiang Ming Chen, Xiang Ming Chen orcid.org/0000-0001-7029-0662 Laboratory of Dielectric Materials, School of Materials Science & Engineering, Zhejiang University, Hangzhou, ChinaSearch for more papers by this author Wen Bin Hong, Wen Bin Hong Laboratory of Dielectric Materials, School of Materials Science & Engineering, Zhejiang University, Hangzhou, ChinaSearch for more papers by this authorLei Li, Corresponding Author Lei Li zjulilei@zju.edu.cn orcid.org/0000-0002-6794-8459 Laboratory of Dielectric Materials, School of Materials Science & Engineering, Zhejiang University, Hangzhou, China Correspondence Lei Li, Laboratory of Dielectric Materials, School of Materials Science & Engineering, Zhejiang University, Hangzhou, China. Email: zjulilei@zju.edu.cn.Search for more papers by this authorMeng Cao, Meng Cao Laboratory of Dielectric Materials, School of Materials Science & Engineering, Zhejiang University, Hangzhou, ChinaSearch for more papers by this authorXiang Ming Chen, Xiang Ming Chen orcid.org/0000-0001-7029-0662 Laboratory of Dielectric Materials, School of Materials Science & Engineering, Zhejiang University, Hangzhou, ChinaSearch for more papers by this author First published: 31 March 2018 https://doi.org/10.1111/jace.15572Citations: 58 Xiang Ming Chen is a Fellow, American Ceramic Society. Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract NaCl ceramics were prepared by room-temperature cold sintering using moistened NaCl powder with 4 wt% water and dry pressing using dehydrated powder. When the applied uniaxial pressure is low, the relative density of dry-pressed NaCl ceramic is significantly lower than that of cold-sintered ceramic, while the former is 98.5%-99.3% and much higher than the latter (94.3%-94.6%) for high applied pressure of 200-300 MPa. The uniaxial pressure-induced plastic deformation dominates the densification of dry-pressed NaCl ceramic, and also plays a role during cold sintering as well as the dissolution-precipitation process. The lower density of cold-sintered NaCl ceramic under high applied pressure is attributed to the trapped water in ceramic body during cold sintering. Besides, the presence of water always promotes the microstructural homogeneity, which is responsible for the much higher Qf value of cold-sintered NaCl ceramic. The optimal microwave dielectric properties with εr = 5.55, Qf = 49 600 GHz, and τf = −173 ppm/°C are obtained in cold-sintered NaCl ceramic under the applied pressure of 300 MPa, indicating that it is a promising candidate as a microwave dielectric material. Citing Literature Volume101, Issue9September 2018Pages 4038-4043 RelatedInformation