In:
Advanced Engineering Materials, Wiley
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 TiB 2 /SiCN composites, the environmental interference of temperature fluctuations is successfully eliminated, and a temperature‐independent TFSG is fabricated. The effects of pyrolysis temperature and TiB 2 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 TiB 2 /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.
Type of Medium:
Online Resource
ISSN:
1438-1656
,
1527-2648
DOI:
10.1002/adem.202300516
Language:
English
Publisher:
Wiley
Publication Date:
2023
detail.hit.zdb_id:
2016980-2
detail.hit.zdb_id:
1496512-4
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