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Microstructure Tailored Functionally Graded Alumina/Lanthanum Hexaaluminate Ceramics for Application as Thermal Barrier Coatings
Author(s) -
Negahdari Zahra,
WillertPorada Monika
Publication year - 2009
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.200900147
Subject(s) - materials science , lanthanum , volume fraction , microstructure , composite material , thermal barrier coating , ceramic , porosity , thermal diffusivity , fracture toughness , composite number , gradation , inorganic chemistry , chemistry , physics , quantum mechanics , computer science , computer vision
The thermal and mechanical properties of a functionally graded lanthanum hexaaluminate‐alumina ceramic are described. The gradation of functionality is based on different volume fraction of lanthanum hexaaluminate, varying from 0 to 80 vol% and corresponding porosity from 2 to 32 vol%. The highest volume fraction of lanthanum hexaaluminate enables a five time reduced thermal diffusivity as compared to alumina. The fracture toughness and elastic modulus is highest for a 20 vol% lanthanum hexaaluminate‐alumina composite.