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- Title
Temperature‐Independent Conductive Ceramic for High‐Temperature Strain‐Sensing Applications.
- Authors
Wu, Chao; He, Yingping; Li, Lanlan; Chen, Guochun; Fu, Yanzhang; Zeng, Yingjun; Xu, Lida; Lin, Fan; Pan, Xiaochuan; Chen, Qinnan; Zhao, Yang; Sun, Daoheng; Hai, Zhenyin
- Abstract
Temperature‐independent properties are critical for high‐temperature thin‐film strain gauges (TFSGs). In this study, by controlling the electron scattering and tunneling effects in the TiB2/SiCN composites, the environmental interference of temperature fluctuations is successfully eliminated, and a temperature‐independent TFSG is fabricated. The effects of pyrolysis temperature and TiB2 content on the microstructural evolution and electrical properties of the ceramic films are studied. The temperature insensitivity is mainly attributed to the balance between the intrasheet resistance with a positive temperature coefficient of resistance (TCR) and the intersheet resistance with a negative TCR. This composite shows nearly constant resistance values over an ultrawide temperature range of 300–700 °C, with less than 0.05% deviation of the normalized resistance and TCR values as low as 1.6 ppm °C−1. In addition, the TiB2/SiCN films exhibited stable piezoresistive responses, with a gauge factor of 4.28, and the temperature‐independent strain response in the high‐temperature range is verified.
- Subjects
TEMPERATURE coefficient of electric resistance; STRAIN gages; ELECTRON scattering; ELECTRON tunneling; QUANTUM tunneling composites; CERAMICS
- Publication
Advanced Engineering Materials, 2023, Vol 25, Issue 20, p1
- ISSN
1438-1656
- Publication type
Article
- DOI
10.1002/adem.202300516