Effect of Two-Step Sintering on the Mechanical and Electrical Properties of 5YSZ and 8YSZ Ceramics
Yttria-stabilized zirconia (YSZ) has been widely used in structural and functional ceramics because of its excellent physicochemical properties. In this paper, the density, average gain size, phase structure, and mechanical and electrical properties of conventionally sintered (CS) and two-step sinte...
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2023-02-01
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| author | Yunpeng Li Hongqian Sun Jing Song Zhiyu Zhang Hao Lan Liangliang Tian Keqiang Xie |
| author_facet | Yunpeng Li Hongqian Sun Jing Song Zhiyu Zhang Hao Lan Liangliang Tian Keqiang Xie |
| author_sort | Yunpeng Li |
| collection | DOAJ |
| description | Yttria-stabilized zirconia (YSZ) has been widely used in structural and functional ceramics because of its excellent physicochemical properties. In this paper, the density, average gain size, phase structure, and mechanical and electrical properties of conventionally sintered (CS) and two-step sintered (TSS) 5YSZ and 8YSZ are investigated in detail. As the grain size of YSZ ceramics became smaller, dense YSZ materials with a submicron grain size and low sintering temperature were optimized in terms of their mechanical and electrical properties. 5YSZ and 8YSZ in the TSS process significantly improved the plasticity, toughness, and electrical conductivity of the samples and significantly suppressed the rapid grain growth. The experimental results showed that the hardness of the samples was mainly affected by the volume density, that the maximum fracture toughness of 5YSZ increased from 3.514 MPa·m<sup>1/2</sup> to 4.034 MPa·m<sup>1/2</sup> in the TSS process, an increase of 14.8%, and that the maximum fracture toughness of 8YSZ increased from 1.491 MPa·m<sup>1/2</sup> to 2.126 MPa·m<sup>1/2</sup>, an increase of 42.58%. The maximum total conductivity of the 5YSZ and 8YSZ samples under 680 °C increased from 3.52 × 10<sup>−3</sup> S/cm and 6.09 × 10<sup>−3</sup> S/cm to 4.52 × 10<sup>−3</sup> S/cm and 7.87 × 10<sup>−3</sup> S/cm, an increase of 28.41% and 29.22%, respectively. |
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| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T07:18:47Z |
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| spelling | doaj.art-acb8407b745c4a4c854f515af5e533762023-11-17T08:06:03ZengMDPI AGMaterials1996-19442023-02-01165201910.3390/ma16052019Effect of Two-Step Sintering on the Mechanical and Electrical Properties of 5YSZ and 8YSZ CeramicsYunpeng Li0Hongqian Sun1Jing Song2Zhiyu Zhang3Hao Lan4Liangliang Tian5Keqiang Xie6National Engineering Research Center for Green Recycling of Strategic Metal Resource, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, ChinaNational Engineering Research Center for Green Recycling of Strategic Metal Resource, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, ChinaNational Engineering Research Center for Green Recycling of Strategic Metal Resource, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, ChinaNational Engineering Research Center for Green Recycling of Strategic Metal Resource, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, ChinaGanjiang Innovation Research Institute, Chinese Academy of Sciences, Ganzhou 341119, ChinaSchool of Electronic Information and Electrical Engineering, Chongqing University of Arts and Sciences, Chongqing 402160, ChinaCollege of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaYttria-stabilized zirconia (YSZ) has been widely used in structural and functional ceramics because of its excellent physicochemical properties. In this paper, the density, average gain size, phase structure, and mechanical and electrical properties of conventionally sintered (CS) and two-step sintered (TSS) 5YSZ and 8YSZ are investigated in detail. As the grain size of YSZ ceramics became smaller, dense YSZ materials with a submicron grain size and low sintering temperature were optimized in terms of their mechanical and electrical properties. 5YSZ and 8YSZ in the TSS process significantly improved the plasticity, toughness, and electrical conductivity of the samples and significantly suppressed the rapid grain growth. The experimental results showed that the hardness of the samples was mainly affected by the volume density, that the maximum fracture toughness of 5YSZ increased from 3.514 MPa·m<sup>1/2</sup> to 4.034 MPa·m<sup>1/2</sup> in the TSS process, an increase of 14.8%, and that the maximum fracture toughness of 8YSZ increased from 1.491 MPa·m<sup>1/2</sup> to 2.126 MPa·m<sup>1/2</sup>, an increase of 42.58%. The maximum total conductivity of the 5YSZ and 8YSZ samples under 680 °C increased from 3.52 × 10<sup>−3</sup> S/cm and 6.09 × 10<sup>−3</sup> S/cm to 4.52 × 10<sup>−3</sup> S/cm and 7.87 × 10<sup>−3</sup> S/cm, an increase of 28.41% and 29.22%, respectively.https://www.mdpi.com/1996-1944/16/5/2019YSZtwo-step sinteringgrain refiningfracture toughnesselectrical conductivity |
| spellingShingle | Yunpeng Li Hongqian Sun Jing Song Zhiyu Zhang Hao Lan Liangliang Tian Keqiang Xie Effect of Two-Step Sintering on the Mechanical and Electrical Properties of 5YSZ and 8YSZ Ceramics Materials YSZ two-step sintering grain refining fracture toughness electrical conductivity |
| title | Effect of Two-Step Sintering on the Mechanical and Electrical Properties of 5YSZ and 8YSZ Ceramics |
| title_full | Effect of Two-Step Sintering on the Mechanical and Electrical Properties of 5YSZ and 8YSZ Ceramics |
| title_fullStr | Effect of Two-Step Sintering on the Mechanical and Electrical Properties of 5YSZ and 8YSZ Ceramics |
| title_full_unstemmed | Effect of Two-Step Sintering on the Mechanical and Electrical Properties of 5YSZ and 8YSZ Ceramics |
| title_short | Effect of Two-Step Sintering on the Mechanical and Electrical Properties of 5YSZ and 8YSZ Ceramics |
| title_sort | effect of two step sintering on the mechanical and electrical properties of 5ysz and 8ysz ceramics |
| topic | YSZ two-step sintering grain refining fracture toughness electrical conductivity |
| url | https://www.mdpi.com/1996-1944/16/5/2019 |
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