Effect of Annealing Time on the Cyclic Characteristics of Ceramic Oxide Thin Film Thermocouples

Abstract

Oxide thin film thermocouples (TFTCs) are widely used in high-temperature environment measurements and have the advantages of good stability and high thermoelectric voltage. However, different annealing processes affect the performance of TFTCs. This paper studied the impact of different annealing times on the cyclic characteristics of ceramic oxide thin film thermocouples. ITO/In2O3 TFTCs were prepared on alumina ceramics by a screen printing method, and the samples were annealed at different times. The microstructure of the ITO film was studied by scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The results show that when the annealing temperature is fixed, the stability of the thermocouple is worst when it is annealed for 2 h. Extending the annealing time can improve the properties of the film, increase the density, slow down oxidation, and enhance the thermal stability of the thermocouple. The thermal cycle test results show that the sample can reach five temperature rise and fall cycles, more than 50 h, and can meet the needs of stable measurement in high temperature and harsh environments.

Sandwich probe temperature sensor based on In2O3-IZO thin film for ultra-high temperatures

“…Lastly the assembled parts are placed in a furnace for hightemperature treatment to evaporate alpha-terpineol and ethyl cellulose. In addition, high-temperature treatment can melt the glass powder to bond the powder of sensitive materials, and high temperature also helps the growth of grain size of the sensitive materials which will improve the thermoelectric performance [19,34,47]. After these procedurals, the IZO based probe-style TFTC with the sandwich structure is obtained.…”

“…Moreover, it is important to evaluate the effectiveness of surface thermal protection in hypersonic aircraft. In process industries such as steel metallurgy and energy conversion, precise control of temperature directly affects chemical reactions and product quality, and inappropriate temperatures will lead to the formation of harmful by-products [19][20][21][22]. However, traditional high-temperature measurement methods, such as armored thermocouples, temperature indicating paint, and crystal temperature measurement, cannot meet the requirements of real-time and rapid high-temperature measurement [23].…”

Enhanced Thermoelectric Performance of Na0.55CoO2 Ceramics Doped by Transition and Heavy Metal Oxides

“…Nevertheless, since the 1960s, a number of effective thermoelectrics have been developed, which are successfully used in the production of thermoelectric devices of different purposes (TEGs, thermoelectric refrigerators (coolers), thermocouples, etc.) [6][7][8]. Traditional thermoelectrics on the base of layered chalcogenides of bismuth and tellurium possess several drawbacks since they contain toxic, rare, and expensive components, are unstable in the air at high temperatures due to oxidation by atmospheric oxygen, etc.…”