Improved Adhesion of Different Environmental Barrier Coatings on Al2O3/Al2O3‐Ceramic Matrix Composites,Advanced Engineering Materials

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Improved Adhesion of Different Environmental Barrier Coatings on Al2O3/Al2O3‐Ceramic Matrix Composites
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-04-13 , DOI: 10.1002/adem.202000087
Caren Gatzen ₁ , Daniel Emil Mack ₁ , Olivier Guillon _{1,

2} , Robert Vaßen ₁

Affiliation

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 Al₂O₃/Al₂O₃‐CMC are investigated. In particular, the influence of surface structuring by laser ablation prior to coating production is investigated. Y₂O₃, yttria‐stabilized zirconia (YSZ), and Gd₂Zr₂O₇ 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.

中文翻译：

Al2O3 / Al2O3-陶瓷基复合材料上不同环境屏障涂层的附着力得到改善

在高温燃烧气氛中，需要使用附着力强的环境屏障涂层（EBC），以保护下面的陶瓷基复合材料（CMC）免受腐蚀。本文研究了通过大气等离子喷涂（APS）在Al ₂ O ₃ / Al ₂ O ₃ -CMC上生产的三种不同涂层的粘附机理。特别地，研究了在涂层生产之前通过激光烧蚀形成的表面结构的影响。Y ₂ O ₃，氧化钇稳定的氧化锆（YSZ）和Gd ₂ Zr ₂ O ₇被选为潜在的EBC。通过熔炉循环，拉附着力试验和带有梯度的燃烧器试验来分析具有或不具有表面结构化的CMC基材上的涂层附着力。热处理前后在涂层与基材之间的相互作用及其对涂层附着力和寿命的影响尤其引起关注。发现了两种不同的粘附机理：由化学反应促进的粘附和由机械互锁促进的粘附。

更新日期：2020-04-13

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