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A Novel Approach for Durability Evaluation of Metal Protective Coatings in Dynamic Interplay with the Liquid Alloy

Pałka Paweł, Boczkal Grzegorz, Hotloś Agnieszka, Mrówka-Nowotnik Grażyna

Archives of Foundry Engineering

2023

Vol. 23, iss. 4

40--48

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.

Protective coatings for aluminium die casting moulds and continuous casting moulds: a review

Góral Marek, Mrówka-Nowotnik Grażyna

Ochrona przed Korozją

2020

nr 7

216--219

The article presents an overview of currently used coatings for the surface protection of die casting moulds and continuous casting moulds against liquid Al. The analysis of literature data indicates that coatings based on CrN, TiN nitrides, carbonitrides and carbides (TiC), as well as multilayer coatings are most commonly used. Various PVD and CVD processes are used for their production. Coatings produced by thermal spraying processes are also of great importance. The results described in the literature are divergent, which hinders the selection of a protective coating for new applications and determines the performance of experimental studies.

W artykule przedstawiono przegląd obecnie stosowanych powłok do ochrony powierzchni kokili do odlewania ciśnieniowego oraz krystalizatorów do ciągłego odlewania przed oddziaływaniem ciekłego aluminium. Analiza danych literaturowych wskazuje, że najczęściej stosowane są powłoki oparte na azotkach CrN, TiN, węglikoazotkach i węglikach (TiC) oraz wielowarstwowe. Do ich wytwarzania stosuje się różne procesy PVD i CVD. Duże znaczenie mają też powłoki wytwarzane w procesach natryskiwania cieplnego. Wyniki opisane w literaturze są rozbieżne co utrudnia dobór powłoki ochronnej dla nowych zastosowań i determinuje przeprowadzenie badań eksperymentalnych.