scholarly journals A Handy Flexible Micro-Thermocouple Using Low-Melting-Point Metal Alloys

Sensors ◽  
2019 ◽  
Vol 19 (2) ◽  
pp. 314 ◽  
Author(s):  
Qifu Wang ◽  
Meng Gao ◽  
Lunjia Zhang ◽  
Zhongshan Deng ◽  
Lin Gui
Keyword(s):  
Thin Film ◽  
Melting Point ◽  
Seebeck Coefficient ◽  
Metal Alloy ◽  
Experimental Results ◽  
Metal Alloys ◽  
Microfluidic Chips ◽  
Mass Ratio ◽  
Flexible Devices ◽  
Thin Film Thermocouples

A handy, flexible micro-thermocouple using low-melting-point metal alloys is proposed in this paper. The thermocouple has the advantages of simple fabrication and convenient integration. Bismuth/gallium-based mixed alloys are used as thermocouple materials. To precisely inject the metal alloys to the location of the sensing area, a micro-polydimethylsiloxane post is designed within the sensing area to prevent outflow of the metal alloy to another thermocouple pole during the metal-alloy injection. Experimental results showed that the Seebeck coefficient of this thermocouple reached −10.54 μV/K, which was much higher than the previously reported 0.1 μV/K. The thermocouple was also be bent at 90° more than 200 times without any damage when the mass ratio of the bismuth-based alloy was <60% in the metal-alloy mixture. This technology mitigated the difficulty of depositing traditional thin–film thermocouples on soft substrates. Therefore, the thermocouple demonstrated its potential for use in microfluidic chips, which are usually flexible devices.

Application of Nanometer Metal Oxides in Infrared Ray Shielding Transparent Thin Film

2011 ◽  
Vol 474-476 ◽  
pp. 195-199 ◽  
Author(s):  
Ai Hong Guo ◽  
Xue Jiao Tang ◽  
Su Juan Zhang
Keyword(s):  
Thin Film ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Sol Gel ◽  
Volume Ratio ◽  
Experimental Results ◽  
Mass Ratio ◽  
Gel Method ◽  
Water Based ◽  
Better Than

Water-based infrared ray shielding coating, that is, nanometer metal oxide is added to the water-based paint, which has anti-IR features without affecting the transparency of the paint. In this paper, the nanometer oxides are prepared by sol-gel method, added into polypropylene sour. In order to improve the infrared ray shielding of the thin film, two kinds of nanometer oxides are added into the polypropylene sour with different volume ratios, the shielding performance of the paint is studied. Experimental results show: in the 8000 ~ 4000cm-1 range, the transmittances of infrared ray is 30% to 75%; in 4000 ~ 400cm-1 range, transmittances decrease significantly; 3% ZnO, 3% Fe2O3, 3% Y2O3, 2% Al2O3 are the best mass ratio of every single nanometer oxide; the infrared shielding rate of Fe2O3 and Y2O3 mixture with the volume ratio of 1 to 4 is better than Fe2O3 and Y2O3 single.

scholarly journals Effects of AlN and BCN Thin Film Multilayer Design on the Reaction Time of Ni/Ni-20Cr Thin Film Thermocouples on Thermally Sprayed Al2O3

Sensors ◽  
2019 ◽  
Vol 19 (15) ◽  
pp. 3414
Author(s):  
Tillmann ◽  
Kokalj ◽  
Stangier ◽  
Schöppner ◽  
Malatyali
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Reaction Time ◽  
Seebeck Coefficient ◽  
Physical Structure ◽  
Boron Carbonitride ◽  
Deposition Parameters ◽  
Thin Film Thermocouples ◽  
Nitride Layers ◽  
The Impact

Thin film thermocouples are widely used for local temperature determinations of surfaces. However, depending on the environment in which they are used, thin film thermocouples need to be covered by a wear or oxidation resistant top layer. With regard to the utilization in wide-slit nozzles for plastic extrusion, Ni/Ni-20Cr thin film thermocouples were manufactured using direct-current (DC) magnetron sputtering combined with Aluminiumnitride (AlN) and Boron-Carbonitride (BCN) thin films. On the one hand, the deposition parameters of the nitride layers were varied to affect the chemical composition and morphology of the AlN and BCN thin films. On the other hand, the position of the nitride layers (below the thermocouple, above the thermocouple, around the thermocouple) was changed. Both factors were investigated concerning the influence on the Seebeck coefficient and the reaction behaviour of the thermocouples. Therefore, the impact of the nitride thin films on the morphology, physical structure, crystallite size, electrical resistance and hardness of the Ni and Ni-20Cr thin films is analysed. The investigations reveal that the Seebeck coefficient is not affected by the different architectures of the thermocouples. Nevertheless, the reaction time of the thermocouples can be significantly improved by adding a thermal conductive top coat over the thin films, whereas the top coat should have a coarse structure and low nitrogen content.

High Temperature Silicide Thin-Film Thermocouples

1993 ◽  
Vol 322 ◽  
Author(s):  
Kenneth G. Kreider
Keyword(s):  
Thin Film ◽  
High Temperature ◽  
Seebeck Coefficient ◽  
Harsh Environments ◽  
Thin Film Sensors ◽  
Film Instability ◽  
Potential Applications ◽  
Thin Film Thermocouples ◽  
Sputter Deposited ◽  
Excellent Stability

AbstractHigh-temperature silicides have been used in mechanical structures, heating elements, and electronic, CMOS applications. Their stability in high temperature oxidizing environments and excellent electrical conductivity may also make them useful as high temperature thin-film sensors in harsh environments. We have investigated sputter deposited MoSi2, ReSi2, TaSi2, TiSi2, and WSi2 thin films and characterized their performance as thermoelements and stability up to 1200 °C. A multilayer technique was developed to ensure constant silicide stoichiometry during oxidation thereby maintaining a constant Seebeck coefficient. In addition techniques were developed to suppress the formation of metal oxides from the silicides. The results indicated excellent stability of Seebeck coefficient up to 1200 °C. These results are compared with the problems of thin film instability in the Seebeck coefficient found in noble metal thermocouples. Potential applications for temperature and heat transfer measurements will be discussed.

Thin Film Thermocouples for Surface Temperature Measurement of Turbine Blade

2013 ◽  
Vol 873 ◽  
pp. 420-425 ◽  
Author(s):  
Yin Zhi Chen ◽  
Hong Chuan Jiang ◽  
Shu Wen Jiang ◽  
Xing Zhao Liu ◽  
Wan Li Zhang
Keyword(s):  
Thin Film ◽  
Seebeck Coefficient ◽  
Surface Temperature ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Life Time ◽  
Surface Temperature Measurement ◽  
Nickel Based Superalloy ◽  
Type K ◽  
Thin Film Thermocouples

There are three types thin film thermocouples (TFTCs) fabricated on the nickel-based superalloy substrates, including type-K (Ni-10%Cr/Ni-3%Si), type-S (Pt-10%Rh/Pt) and indium tin oxide (ITO) versus platinum (Pt) TFTCs. All of the samples were calibrated and cycled in tube furnace. The Seebeck coefficient of type-K, type-S and ITO/Pt TFTCs is 36.53 μV/°C, 8.89 μV/°C and 81.67 μV/°C, respectively. The life time of type-K and type-S TFTCs is 3 calibrating cycles (about 25 h) and 2 calibrating cycles (about 20 h), respectively. The ITO/Pt TFTCs shows longer life time that is longer than 5 cycles (about 50 h).

Synthesis of Nanocomposite thin film Ti/Al Multilayers and Ti-Aluminides

1996 ◽  
Vol 457 ◽  
Author(s):  
R. Banerjee ◽  
X. D. Zhang ◽  
S. A. Dregia ◽  
H. L. Fraser
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Magnetron Sputtering ◽  
Layer Thickness ◽  
Thermodynamic Model ◽  
Interfacial Reactions ◽  
Experimental Results ◽  
Structural Transitions ◽  
Nanocomposite Thin Film ◽  
Multilayered Thin Films

ABSTRACTNanocomposite Ti/Al multilayered thin films have been deposited by magnetron sputtering. These multilayers exhibit interesting structural transitions on reducing the layer thickness of both Ti and Al. Ti transforms from its bulk stable hep structure to fee and Al transforms from fee to hep. The effect of ratio of Ti layer thickness to Al layer thickness on the structural transitions has been investigated for a constant bilayer periodicity of 10 nm by considering three different multilayers: 7.5 nm Ti / 2.5 nm Al, 5 nm Ti / 5 nm Al and 2.5 nm Ti / 7.5 nm Al. The experimental results have been qualitatively explained on the basis of a thermodynamic model. Preliminary experimental results of interfacial reactions in Ti/Al bilayers resulting in the formation of Ti-aluminides are also presented in the paper.

scholarly journals Ceramic thin film thermocouples for SiC-based ceramic matrix composites

2012 ◽  
Vol 520 (17) ◽  
pp. 5801-5806 ◽  
Author(s):  
John D. Wrbanek ◽  
Gustave C. Fralick ◽  
Dongming Zhu
Keyword(s):  
Thin Film ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Matrix Composites ◽  
Ceramic Thin Film ◽  
Thin Film Thermocouples

Molecularly Mediated Thin Film Assembly of Nanoparticles on Flexible Devices: Electrical Conductivity versus Device Strains in Different Gas/Vapor Environment

ACS Nano ◽  
2011 ◽  
Vol 5 (8) ◽  
pp. 6516-6526 ◽  
Author(s):  
Jun Yin ◽  
Peipei Hu ◽  
Jin Luo ◽  
Lingyan Wang ◽  
Melissa F. Cohen ◽  
...  
Keyword(s):  
Thin Film ◽  
Electrical Conductivity ◽  
Flexible Devices ◽  
Film Assembly
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