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Water vapor corrosion test using supersonic gas velocities
Author(s) -
Gatzen Caren,
Mack Daniel E.,
Guillon Olivier,
Vaßen Robert
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16595
Subject(s) - corrosion , water vapor , supersonic speed , oxide , materials science , bar (unit) , coating , work (physics) , volumetric flow rate , environmental science , metallurgy , composite material , chemistry , mechanics , mechanical engineering , engineering , meteorology , aerospace engineering , physics , organic chemistry
Testing of the corrosion resistance of environmental barrier coating (EBC) systems is necessary for developing reliable coatings. Unfortunately tests under realistic gas turbine conditions are difficult and expensive. The materials under investigation as well as parts of the test setup have to withstand high temperatures (≥1200°C), high pressure (up to 30 bar) as well as the corrosive atmosphere (H 2 O, O 2 , NO x ). Therefore most lab scale test‐rigs focus on simplified test conditions. In this work water vapor corrosion testing of EBCs with a high velocity oxy fuel (HVOF) facility is introduced which combines high temperatures and high gas velocities. It leads to quite high recession rates in short periods of time, which are comparable to results from literature. It was found that high flow velocities can easily compensate low gas pressures. HVOF‐testing is a simple and fast way to measure the recession rate of an EBC‐system. As proof of concept the recession rates of an oxide/oxide CMC with and without EBC were measured.