Abstract
As a pore precursor, carbon black with different content of 0 to 60 vol% were added to (Ba,Sr)<TEX>$TiO_3$</TEX> powder. Porous (Ba,Sr)<TEX>$TiO_3$</TEX> ceramics were prepared by pressureless sintering at <TEX>$1350^{\circ}C$</TEX> for 1h under air. Effects of carbon black content on the microstructure and PTCR characteristics of porous (Ba,Sr)<TEX>$TiO_3$</TEX> ceramics were investigated. The porosity of porous (Ba,Sr)<TEX>$TiO_3$</TEX> ceramics increased from 6.97% to 18.22% and the grain size slightly decreased from <TEX>$7.51\;{\mu}m$</TEX> to <TEX>$5.96\;{\mu}m$</TEX> with increasing carbon black contents. PTCR jump of the (Ba,Sr)<TEX>$TiO_3$</TEX> ceramics prepared by adding carbon black was more than <TEX>$10^5$</TEX>, and slightly increased with increasing carbon black. The PTCR jump in the (Ba,Sr)<TEX>$TiO_3$</TEX> ceramics prepared by adding 40 vol% carbon black showed an excellent value of <TEX>$9.68{\times}10^5$</TEX>, which was above two times higher than that in (Ba,Sr)<TEX>$TiO_3$</TEX> ceramics. These results correspond with Heywang model for the explanation of PTCR effect in (Ba,Sr)<TEX>$TiO_3$</TEX> ceramics. It was considered that carbon black is an effective additive for preparing porous <TEX>$BaTiO_3$</TEX> based ceramics. It is believed that newly prepared (Ba,Sr)<TEX>$TiO_3$</TEX> cermics can be used for PTC thermistor.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
