Conductivity of SiCNO-BN composite ceramics and their application in wireless passive temperature sensor. Issue 10 (15th May 2021)

• Record Type: Journal Article
• Authors: Yu, Yuxi; Xu, Wenlong; Xu, Jie; Zhu, Jian; Cong, Minghui
• Is Part Of: Ceramics international. Volume 47:Issue 10(2021)Part A
• Page Start: 14490
• Page End: 14497
• Publication Date: 2021-05-15
• Subjects: Composites -- Electrical conductivity -- Boron nitride -- Temperature sensor -- Higher temperature; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.02.028
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: SiCNO-BN composite ceramics were synthesized by polyvinylsilazane and hexagonal boron nitride. It was found that the electrical conductivity of SiCNO-BN composites varied nonmonotonically with BN content. According to the scanning electron microscope and Raman spectroscopy analysis, we can conclude that the conductive behavior of SiCNO-BN composites was strongly related to the graphitization degree of free carbon in the SiCNO-BN composites. Compared with SiCNO ceramic, the conductivity of the SiCNO-BN composite decreased from 1.68 × 10 −8 (Ω cm) −1 to 4.41 × 10 −9 (Ω cm) −1 when the content of BN was 15 wt%, and the graphitization degree of free carbon also decreased dramatically. The dielectric loss of SiCNO-BN composites was also reduced as the conductivity of SiCNO ceramic decreased. In addition, one of the potential applications of polymer derived ceramics (SiCNO) is high-temperature sensors. However, its real application process is limited. In order to solve this problem, the wireless passive temperature sensors based on SiCNO-BN composite ceramics were fabricated. The results showed that the maximum measurement temperature of SiCNO-BN temperature sensor with 15 wt% BN can reach up to 1250 °C, which is higher than 900 °C of the SiCNO temperature sensor.