Influence of Cr-Content on the thermoelectric and mechanical properties of NiCr thin film thermocouples synthesized on thermally sprayed Al2O3

Tillmann, Wolfgang; Kokalj, David; Stangier, Dominic; Schöppner, Volker; Benis, Hoda Bayazian; Malatyali, Hatice

doi:10.1016/j.tsf.2018.08.023

Cited by 10 publications

(15 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The different multilayer designs are visualized in Figure 1. For the reference thermocouple, the Ni/Ni-20Cr conducting paths were directly dc sputtered on the Al 2 O 3 coating, using a masking system as reported in Reference [13]. The other designs, labelled Option a, Option b and Option c, consist of the same conducting paths and an additional mf sputtered nitride thin film as a top and/or bottom layer consisting of AlN or BCN.…”

Section: Methodsmentioning

confidence: 99%

“…On the chemical level, it is possible to influence the thermoelectric properties of a thermocouple by varying the chemical composition or by doping. In a previous study [13], Ni/Ni-Cr thermocouples were deposited with 10 at.-%, 20 at.-% and 30 at.-% Cr, whereby the thermovoltage is not influenced significantly. Indeed, the reaction time is the fastest for the Ni/Ni-20Cr thin film thermocouple.…”

Section: Introductionmentioning

confidence: 99%

“…However, in certain cases, it is not possible to change the chemical composition. An approach without changing the composition, is to decrease the sensor size of the thin film thermocouples to foster a faster response time and a higher sensitivity [13,15]. In addition, it is possible to influence the physical structure and the morphology of the thin layers by adjusting the PVD deposition parameters, so that the thermoelectric properties are changed [16].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Tillmann

Kokalj

Stangier

et al. 2019

Sensors

View full text Add to dashboard Cite

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.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Tillmann

Kokalj

Stangier

et al. 2019

Sensors

View full text Add to dashboard Cite

show abstract

“…After processing the final dimensions of the ceramic inserts, they were cleaned of contaminations by means of ethanol in an ultrasound bath. Thereafter, the Ni/Ni-Cr thin film thermocouple was deposited on the ceramic inserts using a steel masking system reported in [22] to synthesize the individual Ni and Ni-20Cr conducting paths. The conducting paths were sputtered in DC mode using a heating power of 1200 W and a Ar/Kr gas flow rate of 2.7 at a chamber pressure of 250 mPa.…”

Section: Deposition Processmentioning

confidence: 99%

Combining Thermal Spraying and Magnetron Sputtering for the Development of Ni/Ni-20Cr Thin Film Thermocouples for Plastic Flat Film Extrusion Processes

et al. 2019

Self Cite

View full text Add to dashboard Cite

In the digitalization of production, temperature determination is playing an increasingly important role. Thermal spraying and magnetron sputtering were combined for the development of Ni/Ni-20Cr thin film thermocouples for plastic flat film extrusion processes. On the thermally sprayed insulation layer, AlN and BCN thin films were deposited and analyzed regarding their structural properties and the interaction between the plastic melt and the surfaces using Ball-on-Disc experiments and High-Pressure Capillary Rheometer. A modular tool, containing the deposited Ni/Ni-20Cr thin film thermocouple, was developed and analyzed in a real flat film extrusion process. When calibrating the thin film thermocouple, an accurate temperature determination of the flowing melt was achieved. Industrial type K sensors were used as reference. In addition, PP foils were produced without affecting the surface quality by using thin film thermocouples.

show abstract

“…They received Seebeck coefficient equal to 32.6 mV/K for one such thermocouple. Another example of a microgenerator based on metallic materials was described in the paper by Tillmann et al (2018), where the Ni/NiCr thermocouples were fabricated and characterized. This study was focused on the influence of Cr content on electrical and mechanical properties of the NiCr thin-film thermocouples synthesized on thermally sprayed Al2O3 layer.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of mixed thin-/thick-film thermoelectric microgenerator based on constantan/chromium and silver arms

Gierczak

Prociów

Dziedzic

2020

View full text Add to dashboard Cite

Purpose This paper aims to focus on the fabrication and characterization of mixed thin-/thick-film thermoelectric microgenerators, based on magnetron sputtered constantan (copper–nickel alloy) and screen-printed silver. To improve the adhesion of the constantan layer to the applied substrates, the additional chromium sublayer was used. The aim of the study was to investigate the influence of chromium sublayer on the electrical and thermoelectric properties of such hybrid microgenerators. Design/methodology/approach Fabrication of such structures consisted of several steps – magnetron sputtering of the chromium and then constantan layer, exposing the first arms of thermocouples, applying the second arms by screen-printing technology and firing the prepared structures in a belt furnace. The structures were made both on Al2O3 (alumina) and low temperature co-fired ceramics (LTCC) substrates. Findings To the best of the authors’ knowledge, for the first time, laser ablation process was applied to fabricate the first arms of thermocouples from a layer of constantan only or constantan with a chromium sublayer. Geometric measurements have shown that the mapping of mask pattern by laser ablation technique is very accurate. Originality/value The determined Seebeck coefficient of the realized structures was about 40.4 µV/K. After firing the exemplary structures at 850°C peak temperature, Seebeck coefficient is increased to an average value of 51 µV/K.

show abstract

Influence of Cr-Content on the thermoelectric and mechanical properties of NiCr thin film thermocouples synthesized on thermally sprayed Al2O3

Cited by 10 publications

References 37 publications

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

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

Combining Thermal Spraying and Magnetron Sputtering for the Development of Ni/Ni-20Cr Thin Film Thermocouples for Plastic Flat Film Extrusion Processes

Fabrication and characterization of mixed thin-/thick-film thermoelectric microgenerator based on constantan/chromium and silver arms

Contact Info

Product

Resources

About