카본블랙을 첨가하여 제조한 다공성 BaTiO_3계 세라믹스의 미세구조 및 PTCR 특성 변화
Microstructure and PTCR Characteristics of Porous BaTiO_3-based Ceramics Prepared by Adding Carbon Black
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As a pore precursor, carbon black with different content of 0 to 60 vol% were added to (Ba,Sr)TiO_3powder. Porous (Ba,Sr)TiO_3 ceramics were prepared by pressureless sintering at 1350℃ for 1h under air. Effects of carbon black content on the microstructure and PTCR characteristics of porous (Ba,Sr)TiO_3 ceramics were investigated. The porosity of porous (Ba,Sr)TiO_3 ceramics increased from 6.97% to 18.22% and the grain size slightly decreased from 7.51 μm to 5.96 μm with increasing carbon black contents. PTCR jump of the (Ba,Sr)TiO_3ceramics prepared by adding carbon black was more than 105, and slightly increased with increasing carbon black. The PTCR jump in the (Ba,Sr)TiO_3 ceramics prepared by adding 40 vol% carbon black showed an excellent value of 9.68×105, which was above two times higher than that in (Ba,Sr)TiO_3 ceramics. These results correspond with Heywang model for the explanation of PTCR effect in (Ba,Sr)TiO_3 ceramics. It was considered that carbon black is an effective additive for preparing porous BaTiO3 based ceramics. It is believed that newly prepared (Ba,Sr)TiO_3cermics can be used for PTC thermistor.
Abstract
As a pore precursor, carbon black with different content of 0 to 60 vol% were added to (Ba,Sr)TiO_3powder. Porous (Ba,Sr)TiO_3 ceramics were prepared by pressureless sintering at 1350℃ for 1h under air. Effects of carbon black content on the microstructure and PTCR characteristics of porous (Ba,Sr)TiO_3 ceramics were investigated. The porosity of porous (Ba,Sr)TiO_3 ceramics increased from 6.97% to 18.22% and the grain size slightly decreased from 7.51 μm to 5.96 μm with increasing carbon black contents. PTCR jump of the (Ba,Sr)TiO_3ceramics prepared by adding carbon black was more than 105, and slightly increased with increasing carbon black. The PTCR jump in the (Ba,Sr)TiO_3 ceramics prepared by adding 40 vol% carbon black showed an excellent value of 9.68×105, which was above two times higher than that in (Ba,Sr)TiO_3 ceramics. These results correspond with Heywang model for the explanation of PTCR effect in (Ba,Sr)TiO_3 ceramics. It was considered that carbon black is an effective additive for preparing porous BaTiO3 based ceramics. It is believed that newly prepared (Ba,Sr)TiO_3cermics can be used for PTC thermistor.
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