CN-120709425-B - Distributed temperature measurement method for solid oxide fuel cell unit surface

Abstract

The application relates to the technical field of temperature measurement and discloses a distributed temperature measurement method for the surface of a solid oxide fuel cell unit, which comprises the steps of preparing a PDC film temperature sensor array on the surface of the solid oxide fuel cell to realize the distribution measurement of the surface temperature of the solid oxide fuel cell; the PDC film temperature sensor array comprises a transition layer, an insulating layer, a sensitive layer, a wire layer, a bonding pad, a protective layer and a lead connecting structure, wherein the transition layer is arranged above a cathode, an anode or electrolyte of a solid oxide fuel cell, the insulating layer covers the transition layer, the sensitive layer, the wire layer and the bonding pad are all arranged above the insulating layer, the sensitive layer comprises an array formed by a plurality of temperature sensitive units, the lead connecting structure is connected with the wire layer through the bonding pad, and the protective layer covers the sensitive layer and the wire layer. The application can reduce the process steps and improve the compatibility of the thin film sensor and the solid oxide fuel cell material.

Inventors

• XIE QING
• LAI JIAXIAN
• CHEN SHUYU
• ZHANG YIHAN
• LING YAN
• Cui Zaifu
• HUANG JIAHONG
• Xie Runqin
• WEN JIALI
• YAO ZHAOHONG
• YANG WEN
• GAO XUEJIAN
• ZHANG RUI

Assignees

• 岭南师范学院

Dates

Publication Date

20260508

Application Date

20250708

Claims (5)

1. 1. A method for distributed temperature measurement of a solid oxide fuel cell unit surface, the method comprising: Preparing a PDC film temperature sensor array on the surface of a cathode, an anode or an electrolyte of the solid oxide fuel cell to realize the distribution measurement of the surface temperature of the solid oxide fuel cell, wherein: The PDC film temperature sensor array comprises a transition layer, an insulating layer, a sensitive layer, a wire layer, a bonding pad, a protective layer and a lead connecting structure, wherein the transition layer is arranged above a cathode, an anode or electrolyte of a solid oxide fuel cell, the insulating layer covers the transition layer, the sensitive layer, the wire layer and the bonding pad are all arranged above the insulating layer, the sensitive layer comprises an array formed by a plurality of temperature sensitive units, the lead connecting structure is connected with the wire layer through the bonding pad, and the protective layer covers the sensitive layer and the wire layer; The transition layer is prepared by doping 10-40% of yttria-stabilized zirconia or magnesia nano powder into precursor liquid, wherein the precursor liquid is polysiloxane or polysilazane; the insulating layer is prepared by doping 10-40% of boron nitride, silicon nitride or magnesium oxide nano powder in mass percent into precursor liquid; The sensitive layer is prepared by doping 10-40% of titanium diboride or zirconium diboride or silicon carbide nano powder in mass percent into precursor liquid; the wire layer is prepared by doping 60-80% of titanium diboride or zirconium diboride or silicon carbide nano powder in mass percent into precursor liquid; The protective layer comprises TiB 2 nano powder and an insulating filler, wherein the insulating filler is selected from boron nitride, magnesium oxide or aluminum oxide nano powder.
2. 2. The distributed temperature measurement method of claim 1, wherein the wire connection structure comprises a solder joint formed of platinum wire and PDC material.
3. 3. The distributed temperature measurement method according to any one of claims 1 to 2, wherein the PDC thin film temperature sensor array is prepared on the surface of the solid oxide fuel cell by; Directly writing PDC slurry containing the thermal expansion coefficient regulating filler on the surface of an electrode, and forming a transition layer through pyrolysis; directly writing PDC slurry containing insulating filler on the transition layer, and forming an insulating layer through pyrolysis; Patterning the insulating layer to form a sensitive layer array, a conducting wire layer and a bonding pad, wherein the line width of the sensitive layer is 20-50 mu m smaller than that of the insulating layer by adopting a direct writing or laser etching process; directly writing protective layer slurry on the sensitive layer and the wire layer, and pyrolyzing to form a protective layer; A lead connection structure is connected to the pad.
4. 4. A distributed temperature measurement method according to claim 3, wherein the wire connection structure is prepared by: attaching a polyimide tape to an alumina planar substrate; Placing one end of a platinum wire with the diameter of 0.2 mm-0.4 mm on a polyimide tape, dripping precursor welding spot slurry on one end of the platinum wire on the polyimide tape, heating to 900-1100 ℃, cooling to room temperature, converting the precursor welding spot slurry into precursor ceramic, separating from an alumina ceramic substrate, and tightly connecting with one end of the platinum wire; and removing the oxide layer of the precursor ceramic contact polyimide adhesive tape to form a high-temperature lead connection structure with a platinum wire and a ceramic head.
5. 5. The distributed temperature measurement method according to claim 3, wherein the thickness of the transition layer is 5-30 μm, the thickness of the insulating layer is 5-30 μm, and the thicknesses of the sensitive layer, the conducting wire layer and the bonding pad are consistent and are all 5-30 μm.

Description

Distributed temperature measurement method for solid oxide fuel cell unit surface Technical Field The application relates to the technical field of temperature measurement, in particular to a distributed temperature measurement method for the surface of a solid oxide fuel cell unit. Background The solid oxide fuel cell is a new energy cell with great application prospect, the comprehensive power generation efficiency can reach more than 80 percent, and the solid oxide fuel cell can be applied to a fixed power station, a mobile power generation system, a distributed power station, a new energy automobile, a new energy ship and the like, and has the advantages of no vibration and low noise, high waste heat quality, environment protection, low carbon emission, wide fuel selection range and operating temperature of 500-1000 ℃. Solid oxide fuel cells require heating the cell to a temperature to allow proper operation, and if the temperature is too high or too low, the power generation efficiency is affected, even leading to thermal runaway risks. Therefore, the temperature measurement of the solid oxide cell is very important. At present, the temperature measurement of the solid oxide battery mainly adopts a contact pin type K thermocouple for temperature measurement, and because the contact pin type K thermocouple is large in size, the installation quantity is limited, the distributed temperature measurement cannot be realized, the thermocouple response is slower, in addition, the surface of the contact thermocouple, which is in contact with the solid fuel battery, is of an armoured structure, and the temperature measurement error exists. The surface of the solid oxide battery is measured in temperature, a method of a film temperature sensor can be adopted, and the film sensor can realize rapid, accurate and distributed measurement. The temperature measurement of the solid oxide fuel cell is carried out by adopting a sputtering K-type thin film thermocouple array in literature [Erdogan,Guk,Vijay,et al.Spring Based Connection of External Wires to a Thin Film Temperature Sensor Integrated Inside a Solid Oxide Fuel Cell.[J].Scientific reports, 2019.], the method needs sputtering of two thermocouple electrodes, the process is complex, sputtered alumina is used as an insulating layer, the thermal expansion coefficient of the sputtered alumina and a cathode material is greatly different, and the thermal expansion matching cannot be realized. The Polymer precursor ceramic (Polymer DERIVED CERAMICS, PDC) is a high-temperature resistant material, the precursor is liquid, the types are more, the cost is low, the film can be conveniently formed, different coatings or film sensors can be prepared by filling different materials through different heat treatment processes, and a great deal of documents report that PDC (polycrystalline diamond compact) is prepared into high-temperature resistant film sensors and coatings at present. For the PDC film sensor, the main principle is that the PDC material is made into amorphous semiconductor ceramic by adopting protective atmosphere pyrolysis, and the resistance of the PDC material is reduced along with the temperature rise. For the coating, the basic principle is that nano or micron powder is filled, the PDC is subjected to heat treatment in air to generate SiO 2, and other fillers are subjected to chemical reaction or kept unchanged to form a compact film. As reported in literature [Yanzhang Fu, Lida Xu, Fuxin Zhao, Chenhe Shao, Yuelong Li, Lanlan Li, Songyue Chen, Qinnan Chen, Lingyun Wang, Daoheng Sun, Chao Wu. Ultrafast high-temperature sintering of polymer-derived ceramic thick film sensors[J]. Ceramics International, 2024, 50(19, Part B): 36908-36918.], a high temperature resistant film temperature sensor with a temperature resistance up to 1000 ℃. Literature [Zaifu Cui, Zhenguo Lu, Liwen Huang, Zitong Xu, Zhonghai Wang, Wenjin Duan, Huayu Che, Bohuai Gou, Qiyu Liang, Jiahong Huang, Xiaojun Chen. A ceramic coating from polymer-derived SiCNO for high-temperature electrical insulation on Ni-based alloy substrates[J]. Ceramics International, 2025, 51(7): 9142-9150.] reports a high temperature resistant insulating coating and a thin film thermistor is prepared thereon to measure temperature to 900 ℃. Literature [Chao Wu, Xiaochuan Pan, Fan Lin, Guochun Chen, Lida Xu, Yingjun Zeng, Yingping He, Daoheng Sun, Zhenyin Hai. Al2O3-Modified Polymer-Derived Ceramic SiCN High-Temperature Anti-Oxidative Composite Coating Fabricated by Direct Writing[J]. Polymers, 2022, 14(16): 3281.] reports a protective coating that is resistant to 1000 ℃ and can protect the thin film sensor to 1000 ℃. The PDC material is adopted to prepare the film temperature sensor array, so that the process steps can be reduced, and the high-precision, quick response and distributed measurement of the temperature on the surface of the solid oxide fuel cell can be realized. In summary, how to reduce the process steps