Safety from Failure of Thermally Sprayed Hardmetal Coatings in High-Temperature Applications
Authors: Dr.-Ing. Lutz-Michael Berger, Dr. Susan Conze, Dipl.-Ing. Kerstin Gnauck
DOI: https://doi.org/10.53192/TSB20250142
High-temperature applications of hardmetal coatings for wear protection are connected with numerous challenges. In this study the behavior of structurally different Cr3C2-NiCr coatings and the influence of the Cr3C2/WC ratio in binary coating compositions deposited on a nickel-based alloy (2.4856) or a high-temperature steel (1.4828) was investigated. Heat treatments were conducted at temperatures ranging from 500 to 1000 °C for up to 32 days in various atmospheres (air, nitrogen, argon). Among the coating materials, only the composition 73WC-20-Cr3C2-7Ni was found to be not oxidation-resistant in air at temperatures above 500 °C at long term. The failure of Cr3C2-NiCr coatings at 900 °C is attributed to the formation of a SiO2 layer on the 1.4828 substrate, independent of the atmosphere. A sufficiently high WC content prevented delaminations. In case of the 2.4856 substrates, Cr2O3 layers formed at the substrate did not lead to failure. High WC contents prevented the formation of the Cr2O3 layer.
Pages: 42 - 51
Order this article as a PDF for 8.00 Euro. Send us a short e-mail with your details.
An active subscription enables you to download articles or entire issues as PDF-files. If you already are a subscriber, please login. More information about the subscription
