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Microwave Hybrid Post‐Heat Treatment of Reaction Sintered Alumina/Lanthanum Hexaaluminate Composite Ceramics
Author(s) -
Negahdari Zahra,
WillertPorada Monika
Publication year - 2010
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.200900319
Subject(s) - materials science , sintering , lanthanum , composite number , ceramic , ceramic matrix composite , composite material , microwave , grain growth , microstructure , metallurgy , chemical engineering , inorganic chemistry , chemistry , physics , quantum mechanics , engineering
One of the main problems in development of in situ reaction sintered alumina/lanthanum hexaaluminate composite ceramics is achievement of simultaneous densification and in situ formation of lanthanum hexaaluminate (LHA) platelets inside the matrix. Microwave hybrid post‐sintering was investigated as a method to enhance the solid‐state reaction of LHA formation and the densification of composite ceramics with 2.8–80 vol% LHA. Comparison of the conventionally and microwave assisted sintered alumina/lanthanum hexaaluminate composite ceramics revealed that utilization of microwave heating in second stage of sintering could enhance the solid‐state reaction, the densification, and the anisotropic grain growth of the LHA platelets in ceramics containing more than 20 vol% LHA and for heat treatment at 1500 °C.