Microstructure Tailored Functionally Graded Alumina/Lanthanum Hexaaluminate Ceramics for Application as Thermal Barrier Coatings | Zendy

Negahdari Zahra | Zendy; WillertPorada Monika | Zendy

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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.

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