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Abstract

A method of using the electric charge in a capacitor was applied for the manufacture of thermocouple micro-joints. The motivation for the study was the need to produce a stable welded connection without affecting the geometry of the substrate, which was a thin sheet of Inconel 625 alloy (UNS designation N06625). Within the framework of the research work, a suitable workstation for micro-joints elaboration was built and welding experiments were performed using different electric charges. Studies carried out within the framework of the present work have shown that joints based on Inconel 625 alloy and platinum have the best application properties in the range of small-scale temperature measurements. They can be used, e.g., for monitoring the temperature distribution on the inner surfaces of electric motor casings. An undeniable advantage is in this case the high thermal resistance of both materials used to produce the joint, i.e. the Inconel 625 alloy and platinum. This allows them to be used at high temperatures under atmospheric conditions.

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Authors and Affiliations

G. Boczkal
K. Dadun
P. Palka
A. Hotlos
M. Janoska
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Abstract

The article describes a new test method to quickly evaluate the durability of a protective coating to dynamic contact with liquid metal. The essence of the method is the movement of a drop of liquid metal inside a rotating ring, covered from the inside with the protective coating under test. The parameters determined in the test are analogous to the classic pin-on-disk tribological test. The method was tested for the system: liquid alloy 2017A vs. AlTiN coating on a copper substrate. The test temperature was 750°C, and exposure times ranged from 30 to 90 minutes. Sliding path equivalent for the metal droplet/coating system ranged from 31.6 to 95 m. The study, which included visual evaluation of the surface of the samples, followed by phase and microstructural analysis, showed the high efficiency of the method for assessing the lifetime of protective coatings on contact with liquid metal. The investigated issue was also analyzed from the model side taking into account changes in the diffusion coefficient at the contact of liquid metal with the substrate, occurring with the progressive degradation of the protective coating.
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Bibliography

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Authors and Affiliations

Paweł Pałka
1
ORCID: ORCID
Grzegorz Boczkal
1
ORCID: ORCID
Agnieszka Hotloś
1
ORCID: ORCID
Grażyna Mrówka-Nowotnik
2
ORCID: ORCID

  1. AGH University of Krakow, Faculty of Non-Ferrous Metals Al. Mickiewicza 30, 30-059 Kraków, Poland
  2. Rzeszów University of Technology, Department of Material Science Al. Powstańców Warszawy 12, 35-959 Rzeszów, Poland

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