Tungsten-rhenium thin film thermocouples for SiC-based ceramic matrix composites

Tian, Bian; Zhang, Zhongkai; Shi, Peng; Zheng, Cheng; Yu, Qiuyue; Jing, Weixuan; Jiang, Zhuangde

doi:10.1063/1.4973967

Cited by 35 publications

(12 citation statements)

References 3 publications

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“…Various noncontacting sensing technologies have been employed, such as optic pyrometers [ 2 ] and acoustic pyrometers [ 3 ], but the measuring temperature of turbine engines is not direct and accurate, due to the principles of these technologies, and their complicated structures and sensing modules do not make them easy to integrate with the turbine engine. However, thin-film thermocouples (TFTCs) as a typical kind of immersive sensor can be deposited directly onto the surfaces of turbine engine components with a thickness of a few micro/nanometers using modern deposition technologies; they have been promising as thermal sensors for turbine engines due to the advantages of excellent spatial resolution, cost-effective in large quantities, and rapid response [ 4 , 5 , 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Optimizing the Properties of La0.8Sr0.2CrO3 Thin Films through Post-Annealing for High-Temperature Sensing

et al. 2021

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La0.8Sr0.2CrO3 (0.2LSCO) thin films were prepared via the RF sputtering method to fabricate thin-film thermocouples (TFTCs), and post-annealing processes were employed to optimize their properties to sense high temperatures. The XRD patterns of the 0.2LSCO thin films showed a pure phase, and their crystallinities increased with the post-annealing temperature from 800 °C to 1000 °C, while some impurity phases of Cr2O3 and SrCr2O7 were observed above 1000 °C. The surface images indicated that the grain size increased first and then decreased, and the maximum size was 0.71 μm at 1100 °C. The cross-sectional images showed that the thickness of the 0.2LSCO thin films decreased significantly above 1000 °C, which was mainly due to the evaporation of Sr2+ and Cr3+. At the same time, the maximum conductivity was achieved for the film annealed at 1000 °C, which was 6.25 × 10−2 S/cm. When the thin films post-annealed at different temperatures were coupled with Pt reference electrodes to form TFTCs, the trend of output voltage to first increase and then decrease was observed, and the maximum average Seebeck coefficient of 167.8 µV/°C was obtained for the 0.2LSCO thin film post-annealed at 1100 °C. Through post-annealing optimization, the best post-annealing temperature was 1000 °C, which made the 0.2LSCO thin film more stable to monitor the temperatures of turbine engines for a long period of time.

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Section: Introductionmentioning

confidence: 99%

Optimizing the Properties of La0.8Sr0.2CrO3 Thin Films through Post-Annealing for High-Temperature Sensing

et al. 2021

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“…[4] Furthermore, typical thermocouples based on precious metals such as rhodium and platinum exhibit limited lifetimes due to their sensitivity to attack by corrosive environments. [5] The use of optical temperature sensors is an alternative approach for high-temperature measurements. [6] These sensors are based on the principle of the conversion of temperature information into optical signals.…”

Section: Introductionmentioning

confidence: 99%

Design and Directional Growth of (Mg₁₋_xZn_x)(Al₁₋_yCr_y)₂O₄ Single‐Crystal Fibers for High‐Sensitivity and High‐Temperature Sensing Based on Lattice Doping Engineering and Acoustic Anisotropy

Wang

Zhang

et al. 2021

Adv Funct Materials

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High-performance temperature sensors for the harsh environment are vital components for meeting the increasing demands for the development of existing and emerging technologies. In this study, specifically oriented (Mg 1−x Zn x )(Al 1−y Cr y ) 2 O 4 single-crystal fibers (SCF) are grown by the laserheated pedestal growth technique and used as acoustic waveguides for ultrasonic temperature sensors (UTS) for the first time. The anisotropic sensor performance of the MgAl 2 O 4 SCF-UTS are investigated under a longitudinal wave and transverse wave conditions, and the [110]-oriented MgAl 2 O 4 SCF-UTS is found to have the highest sensitivity and resolution among all the MgAl 2 O 4 SCF-UTS. On this basis, a unit sensitivity of 40.38-67.50 ns °C−1 m −1 and a resolution of 1.24-0.74 °C are achieved for the [110]-oriented (Mg 0.9 Zn 0.1 )(Al 0.995 Cr 0.005 ) 2 O 4 SCF-UTS in the range of 20-1200 °C, both of which represent the best sensor performance achieved by a SCF-UTS to date. The positive temperature-dependent sensor performance, accompanied by a high working temperature (≈2000 °C) and outstanding anti-oxidation, indicates that the [110]-oriented (Mg 0.9 Zn 0.1 )(Al 0.995 Cr 0.005 ) 2 O 4 SCF-UTS is a promising candidate for ultrahigh temperature sensors. This study demonstrates a feasible strategy for the rational design of high-performance temperature sensors through a combination of crystal design, acoustic anisotropy, and lattice doping engineering.

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“…It is hoped that prepared TFTCs have strong high temperature resistance and a high thermoelectric voltage output. The tungsten-rhenium TFTCs have been reported for high temperature measurements of up to about 1500 °C [ 22 , 23 , 24 ]. Typical In 2 O 3 -ITO TFTCs have been reported which have shown a higher thermoelectric voltage output (173 mV at 1273 °C) and high temperature stability.…”

Section: Introductionmentioning

confidence: 99%

Effect of Annealing on the Thermoelectricity Properties of the WRe26-In2O3 Thin Film Thermocouples

et al. 2020

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WRe26-In2O3 (WRe26 (tungsten-26% rhenium) and In2O3 thermoelectric materials) thin film thermocouples (TFTCs) have been fabricated based on magnetron sputtering technology, which can be used in temperature measurement. Many annealing processes were studied to promote the sensitivity of WRe26-In2O3 TFTCs. The optimal annealing process of the thermocouple under this kind of RF magnetron sputtering method was proposed after analyzing the properties of In2O3 films and the thermoelectric voltage of TFTCs at different annealing processes. The calibration results showed that the WRe26-In2O3 TFTCs achieved a thermoelectric voltage of 123.6 mV at a temperature difference of 612.9 K, with a sensitivity of up to 201.6 µV/K. Also, TFTC kept a stable thermoelectric voltage output at 973 K for 20 min and at 773 K for two hours. In general, the WRe26-In2O3 TFTCs developed in this work have great potential for practical applications. In future work, we will focus on the thermoelectric stability of TFTCs at higher temperatures.

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Tungsten-rhenium thin film thermocouples for SiC-based ceramic matrix composites

Cited by 35 publications

References 3 publications

Optimizing the Properties of La0.8Sr0.2CrO3 Thin Films through Post-Annealing for High-Temperature Sensing

Optimizing the Properties of La0.8Sr0.2CrO3 Thin Films through Post-Annealing for High-Temperature Sensing

Design and Directional Growth of (Mg₁₋_xZn_x)(Al₁₋_yCr_y)₂O₄ Single‐Crystal Fibers for High‐Sensitivity and High‐Temperature Sensing Based on Lattice Doping Engineering and Acoustic Anisotropy

Effect of Annealing on the Thermoelectricity Properties of the WRe26-In2O3 Thin Film Thermocouples

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Tungsten-rhenium thin film thermocouples for SiC-based ceramic matrix composites

Cited by 35 publications

References 3 publications

Optimizing the Properties of La0.8Sr0.2CrO3 Thin Films through Post-Annealing for High-Temperature Sensing

Optimizing the Properties of La0.8Sr0.2CrO3 Thin Films through Post-Annealing for High-Temperature Sensing

Design and Directional Growth of (Mg1−xZnx)(Al1−yCry)2O4 Single‐Crystal Fibers for High‐Sensitivity and High‐Temperature Sensing Based on Lattice Doping Engineering and Acoustic Anisotropy

Effect of Annealing on the Thermoelectricity Properties of the WRe26-In2O3 Thin Film Thermocouples

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Design and Directional Growth of (Mg₁₋_xZn_x)(Al₁₋_yCr_y)₂O₄ Single‐Crystal Fibers for High‐Sensitivity and High‐Temperature Sensing Based on Lattice Doping Engineering and Acoustic Anisotropy