@article{Xu2026, 
author = {Yi Xu and Linxue Wen and Tianyu Liu and Yu Fu and Zhaofeng Wang and Tingting Shen and Hongwei Ma and Qinnan Chen},
title = {Synergistic gradient CTE matching and viscoelastic interfacial engineering for high-fidelity in situ thermometry on ceramic matrix composites},
year = {2026},
journal = {Nanotechnology and Precision Engineering},
volume = {9},
number = {2},
keywords = {Ceramic matrix composite, Gradient thermal expansion matching, Interfacial viscoelastic regulation, Polymer-derived ceramic, High-temperature in situ monitoring},
url = {https://www.sciopen.com/article/10.1063/5.0285342},
doi = {10.1063/5.0285342},
abstract = {In situ temperature monitoring of ceramic matrix composites (CMCs) under extreme high-temperature conditions is critical for thermal safety management. However, existing thin-film sensors suffer from cracking and signal drift in their sensitive layers due to the spatial heterogeneity of the CMC matrix’s coefficient of thermal expansion and high-temperature interfacial degradation. Here, a multiscale synergistic regulation strategy is proposed. First, the distribution characteristics of CMC fiber volume fraction are quantified using a Weibull random field model, guiding the design of a TiB2/B2O3 gradient transition layer. Leveraging the viscoelastic transition of B2O3 within the temperature range 450–1860 ℃, dynamic thermal stress dissipation is achieved, reducing interfacial shear stress by 62%. A 3D interpenetrating thermal expansion matching layer is constructed using micro/nano SiC composite powders, enhancing interfacial bonding strength to 19.7 MPa. An Al2O3 insulating layer is subsequently fabricated to improve electrical insulation. Finally, an indium tin oxide/In2O3 thermocouple-sensitive layer is deposited via Weissenberg direct writing, utilizing a polymer-derived ceramic solution as the powder solvent. The resulting sensor exhibits exceptional performance in static air at 1100 ℃: thermoelectric response linearity (R2 > 0.999), a Seebeck coefficient of 168.65 μV/℃, and a low thermoelectric potential drift rate of 1.27%/h over 8 h. This study provides a theoretical foundation and technological prototype for high-precision health monitoring of hot-section components in aeroengines.}
}