PREPARATION AND CHARACTERIZATION OF TiO₂-Ta₂O₅-CaCO₃ VARISTOR CERAMICS BY HOT ISOSTATIC PRESSING (HIP) AND POST-ANNEALING
TiO₂-Ta₂O₅-CaCO₃ varistor ceramics were prepared by hot isostatic pressing (HIP) and annealed in oxygen and nitrogen, respectively. The nonlinear coefficient α, the breakdown voltage EB and the leakage current JL of samples were tested using a varistor dc parameter meter. The average barrier height...
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| Format: | Article |
| Language: | English |
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University of Chemistry and Technology, Prague
2020-12-01
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| Series: | Ceramics-Silikáty |
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http://www.ceramics-silikaty.cz/index.php?page=cs_detail_doi&id=1384
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| _version_ | 1827810000706207744 |
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| author | Kunyong Kang Gang Zhu Chai Xijuan Deng Shuduan Xu Kaimeng |
| author_facet | Kunyong Kang Gang Zhu Chai Xijuan Deng Shuduan Xu Kaimeng |
| author_sort | Kunyong Kang |
| collection | DOAJ |
| description | TiO₂-Ta₂O₅-CaCO₃ varistor ceramics were prepared by hot isostatic pressing (HIP) and annealed in oxygen and nitrogen, respectively. The nonlinear coefficient α, the breakdown voltage EB and the leakage current JL of samples were tested using a varistor dc parameter meter. The average barrier height ΦB of the unannealed samples and the samples annealed in oxygen and nitrogen was calculated. The microstructure of samples was analyzed by STEM-EDS, XRD and SEM. TiO₂-Ta₂O₅-CaCO₃ varistor ceramics with uniform microstructure, fine grains and low porosity was obtained by HIP. By annealing, α increases, while EB and JL decrease. When annealing is performed in oxygen, the oxygen enrichment at the grain boundaries is also helpful to increase α and reduce JL. TiO₂-Ta₂O₅-CaCO₃ varistor ceramics with Ta₂O₅ and CaCO₃ contents of 0.20mol% sintered at 1200°C and annealed at 700°C for 3h in oxygen possesses best varistor performance with α =11.2, EB =22.6V.mm-1 and JL =8.7μA.cm-2. |
| first_indexed | 2024-03-11T22:47:33Z |
| format | Article |
| id | doaj.art-200724b9b5ab42109734d0391553a0ff |
| institution | Directory Open Access Journal |
| issn | 0862-5468 1804-5847 |
| language | English |
| last_indexed | 2024-03-11T22:47:33Z |
| publishDate | 2020-12-01 |
| publisher | University of Chemistry and Technology, Prague |
| record_format | Article |
| series | Ceramics-Silikáty |
| spelling | doaj.art-200724b9b5ab42109734d0391553a0ff2023-09-22T05:21:02ZengUniversity of Chemistry and Technology, PragueCeramics-Silikáty0862-54681804-58472020-12-016511810.13168/cs.2020.003610.13168/cs.2020.0036.20230922051827PREPARATION AND CHARACTERIZATION OF TiO₂-Ta₂O₅-CaCO₃ VARISTOR CERAMICS BY HOT ISOSTATIC PRESSING (HIP) AND POST-ANNEALINGKunyong Kang0Gang Zhu1Chai Xijuan2Deng Shuduan3Xu Kaimeng4 Yunnan Key Laboratory of Wood Adhesive and Glued Product, Southwest Forestry University, Kunming 650224, PR China Yunnan Key Laboratory of Wood Adhesive and Glued Product, Southwest Forestry University, Kunming 650224, PR China Yunnan Key Laboratory of Wood Adhesive and Glued Product, Southwest Forestry University, Kunming 650224, PR China Yunnan Key Laboratory of Wood Adhesive and Glued Product, Southwest Forestry University, Kunming 650224, PR China Yunnan Key Laboratory of Wood Adhesive and Glued Product, Southwest Forestry University, Kunming 650224, PR China TiO₂-Ta₂O₅-CaCO₃ varistor ceramics were prepared by hot isostatic pressing (HIP) and annealed in oxygen and nitrogen, respectively. The nonlinear coefficient α, the breakdown voltage EB and the leakage current JL of samples were tested using a varistor dc parameter meter. The average barrier height ΦB of the unannealed samples and the samples annealed in oxygen and nitrogen was calculated. The microstructure of samples was analyzed by STEM-EDS, XRD and SEM. TiO₂-Ta₂O₅-CaCO₃ varistor ceramics with uniform microstructure, fine grains and low porosity was obtained by HIP. By annealing, α increases, while EB and JL decrease. When annealing is performed in oxygen, the oxygen enrichment at the grain boundaries is also helpful to increase α and reduce JL. TiO₂-Ta₂O₅-CaCO₃ varistor ceramics with Ta₂O₅ and CaCO₃ contents of 0.20mol% sintered at 1200°C and annealed at 700°C for 3h in oxygen possesses best varistor performance with α =11.2, EB =22.6V.mm-1 and JL =8.7μA.cm-2. http://www.ceramics-silikaty.cz/index.php?page=cs_detail_doi&id=1384 titanium oxide (tio₂) varistor ceramis nonlinear coefficient breakdown voltage hot isostatic pressing (hip) post-annealing |
| spellingShingle | Kunyong Kang Gang Zhu Chai Xijuan Deng Shuduan Xu Kaimeng PREPARATION AND CHARACTERIZATION OF TiO₂-Ta₂O₅-CaCO₃ VARISTOR CERAMICS BY HOT ISOSTATIC PRESSING (HIP) AND POST-ANNEALING Ceramics-Silikáty titanium oxide (tio₂) varistor ceramis nonlinear coefficient breakdown voltage hot isostatic pressing (hip) post-annealing |
| title | PREPARATION AND CHARACTERIZATION OF TiO₂-Ta₂O₅-CaCO₃ VARISTOR CERAMICS BY HOT ISOSTATIC PRESSING (HIP) AND POST-ANNEALING |
| title_full | PREPARATION AND CHARACTERIZATION OF TiO₂-Ta₂O₅-CaCO₃ VARISTOR CERAMICS BY HOT ISOSTATIC PRESSING (HIP) AND POST-ANNEALING |
| title_fullStr | PREPARATION AND CHARACTERIZATION OF TiO₂-Ta₂O₅-CaCO₃ VARISTOR CERAMICS BY HOT ISOSTATIC PRESSING (HIP) AND POST-ANNEALING |
| title_full_unstemmed | PREPARATION AND CHARACTERIZATION OF TiO₂-Ta₂O₅-CaCO₃ VARISTOR CERAMICS BY HOT ISOSTATIC PRESSING (HIP) AND POST-ANNEALING |
| title_short | PREPARATION AND CHARACTERIZATION OF TiO₂-Ta₂O₅-CaCO₃ VARISTOR CERAMICS BY HOT ISOSTATIC PRESSING (HIP) AND POST-ANNEALING |
| title_sort | preparation and characterization of tio₂ ta₂o₅ caco₃ varistor ceramics by hot isostatic pressing hip and post annealing |
| topic | titanium oxide (tio₂) varistor ceramis nonlinear coefficient breakdown voltage hot isostatic pressing (hip) post-annealing |
| url |
http://www.ceramics-silikaty.cz/index.php?page=cs_detail_doi&id=1384
|
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