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Improved Adhesion of Different Environmental Barrier Coatings on Al 2 O 3 /Al 2 O 3 ‐Ceramic Matrix Composites
Author(s) -
Gatzen Caren,
Mack Daniel Emil,
Guillon Olivier,
Vaßen Robert
Publication year - 2020
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.202000087
Subject(s) - materials science , coating , adhesion , thermal barrier coating , composite material , ceramic , yttria stabilized zirconia , temperature cycling , combustion , substrate (aquarium) , corrosion , cubic zirconia , chemistry , physics , oceanography , organic chemistry , thermal , meteorology , geology
In high‐temperature combustion atmospheres, well‐adhering environmental barrier coatings (EBCs) are required to protect the underlying ceramic matrix composites (CMCs) from corrosion. Herein the adhesion mechanisms of three different coatings produced by atmospheric plasma spraying (APS) on an Al 2 O 3 /Al 2 O 3 ‐CMC are investigated. In particular, the influence of surface structuring by laser ablation prior to coating production is investigated. Y 2 O 3 , yttria‐stabilized zirconia (YSZ), and Gd 2 Zr 2 O 7 are chosen as potential EBCs. The coating adhesion on CMC‐substrates with and without surface structuring is analyzed by furnace cycling, pull‐adhesion tests, and burner‐rig tests with gradient. Special interest is paid to the interactions at the coating–substrate interface before and after heat treatment and their effect on the coating adhesion and lifetime. Two different adhesion mechanisms are found: adhesion promoted by chemical reaction and adhesion promoted by mechanical interlocking.