INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Influence of Content of Bi0.5Na0.5TiO3 and Bi0.5K0.5TiO3 on the Properties of Lead-free PTC Ceramics of the Ternary Solid Solution System |
ZHAO Ruiyu1,2, OUYANG Qi2, MA Mingsheng2,*, LU Yiqing2, WEI Hongkang1, LIU Zhifu2,*
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1 School of Materials Science and Engineering, Jingdezhen Ceramic University, Jingdezhen 333403, Jiangxi, China 2 Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China |
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Abstract Lead-free PTC thermosensitive ceramics are important electronic ceramic materials to realize green intelligent heating and intelligent protection circuit application. In order to obtain the lead-free PTC thermosensitive ceramics with high Curie temperature and high resistance jump that can be sintered in an air atmosphere, (1-x) BaTiO3-0.5xBi0.5Na0.5TiO3-0.5xBi0.5K0.5TiO3 and 0.98BaTiO3-0.02yBi0.5Na0.5TiO3-0.02(1-y)-Bi0.5K0.5TiO3 ternary solution system ceramics were prepared by the solid phase method, and the effects of different contents of Na and K elements on the sintering behavior and electrical properties of the PTC ceramics were studied. It is found that BNT and BKT formed solid solution with BaTiO3. The average grain size of PTC ceramics decreased with the increase of BNT content. When the contents of BNT and BKT are the same, the semi-conductance of PTC ceramics can be realized in a wide sintering temperature range, and the ceramic samples sintered at 1 200 ℃ in air atmosphere have the best PTC effect, which has a room-temperature resistivity of 128 Ω·cm, resistance jump of about 5 orders, and Curie temperature of 142 ℃.
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Published: 25 May 2023
Online: 2023-05-23
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Fund:Shanghai Youth Science and Technology Star Project (20QA1410200). |
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