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2024
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Industry new knowledge | 3D printing technology to promote the new development of NTC thermistor
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Industry new knowledge
近日，厦门大学Daoheng Sun、Qinnan Chen带领的团队在《Journal of Materials Science & Technology》发表了题为3D printing of thick film NTC thermistor from preceramic polymer composites for ultra-high temperature measurement的研究，Use 3D printing technology to manufacture thick film negative temperature coefficient (NTC) thermistors for extreme high temperature environments.
Original link: https://www.sciencedirect.com/science/article/abs/pii/S1005030224006108
Adventure Technology official website: http://www.adventuretech.cn/
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research content
In high-temperature applications such as aerospace, real-time temperature monitoring is essential for safety assessment and fault diagnosis.Traditional temperature sensors (such as thermocouples and RTDs) are prone to measurement errors at high temperatures and may damage the structure during installation.For this reason, thick/thin film sensor (TFS) has gradually become the development trend of sensing technology in extreme environments due to its advantages such as easy integration with components and fast response speed. However, the existing TFS manufacturing technology (such as physical vapor deposition PVD) has problems such as complexity and limited equipment scale, and it is difficult to meet the demand for high temperature sensors in the aerospace field.
In order to solve this problem,In this paper, a thick film NTC thermistor based on La(Ca)CrO3/polysilazane composite material is studied, and its manufacturing and testing on the surface of turbine blades are realized by 3D printing technology.Two functional ceramic inks were developed in the research to construct a thick-film NTC thermistor with a double-layer structure as a sensitive layer and a protective layer, respectively. This two-layer structure significantly improves the adhesion of the thermistor and enables it to operate stably for a long time at a high temperature of 1300°C and maintain its function for a short time at an extreme temperature of 1550°C.
1,(a) Schematic of direct ink writing for thermistor fabrication. (B) Schematic diagram of the thermistor post-processing process;(c) Optical images of inks with different LCC concentrations;(d) Conductivity of inks with different LCC concentrations at 100°C after high temperature annealing.
2, characterization of LCC/PSZ (75%) films at different annealing temperatures:(a) surface morphology, (B) particle size distribution and change,(c) XRD results,(d) conductivity change,(e) film thickness change.
3 (a) Surface morphology and EDS results of LCC/PSZ thin films after annealing at 1300°C for 1h. (B) Cross-sectional morphology and EDS results of LCC/PSZ films after annealing at 1300°C.
4,(a) scratch test results of a single-layer LCC/PSZ thermistor; (B) scratch test results of a double-layer thermistor with an additional protective layer.
Figure 5, Characterization of the double-layer thermistor:(a) surface morphology of the Cr2O3/PSZ protective layer,(d) partial enlargement of (a), (B) cross-section of the double-layer thermistor,(e) partial enlargement of B,(c) EDS results of the cross-section of the double-layer thermistor.
△ Fig. 6, high temperature resistance test of double-layer thermistor:(a) schematic diagram of double-layer thermistor structure, (B) resistance-temperature curve of thermistor after one round of heating and cooling,(c)SHHE fitting experimental data results,(d) stepped heating test results,(e) stepped cold and hot cycle test results,(f) extreme high temperature resistance test results,(g) comparison of long-term high temperature resistance of single-layer and double-layer thermistors,(h) The thermistor is compared with the high temperature resistance of the thermistor reported in the prior art, and is molded (MP).
△ Figure 7, 3D printed double-layer thermistor on the surface of a turbine blade:(a) the printing process of the thermistor, (B) the optical image of the sample,(c) the schematic diagram of the test device to simulate extreme environments,(d) infrared thermal imaging Results,(e) Flame thermal shock test results,(f) temperature comparison of the thermistor and thermocouple after calibration.
research conclusion
The research work in this paper has created a new type of high temperature sensor manufacturing method based on 3D printing technology. By introducing pre-ceramic polymer composite materials and advanced 3D printing technology, the application problems of traditional sensors in ultra-high temperature environments are solved. This study not only provides new ideas for the design and manufacture of high temperature sensors, but also brings greater flexibility and adaptability to temperature monitoring in complex engineering structures. This technology is expected to further promote the demand for extreme environment sensors in aerospace, energy and other fields in the future.
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