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Influence of yttria surface modification on high temperature corrosion of porous Ni22Cr alloy
Author(s) -
Karczewski Jakub,
Dunst Katarzyna,
Jasinski Piotr,
Molin Sebastian
Publication year - 2017
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12840
Subject(s) - materials science , corrosion , porosity , alloy , microstructure , high temperature corrosion , metallurgy , yttria stabilized zirconia , surface modification , composite material , chemical engineering , ceramic , cubic zirconia , engineering
Protective coatings for porous alloys for high temperature use are relatively new materials. Their main drawback is high temperature corrosion. In this work protective coatings based the on Y‐precursor infiltrated into the sintered Ni22Cr alloys are studied at 700°C. Effects of the amount of the protective phase on the resulting corrosion properties are evaluated in air and humidified hydrogen. Weight gain of the samples, their open porosities and microstructures are analyzed and compared. Results show, that by the addition of even a minor amount of the Y‐precursor corrosion rates can be decreased by a factor of 50.