Abstract
In the present work, the compressibility and sinterability of Al 2O 3–YAG nanocomposite powder prepared by an aqueous sol–gel method have been investigated. An amorphous nanopowder was synthesized, and it was crystallized to Al 2O 3–YAG, with an average particle crystallite size of 50 nm, after heat-treatment via a solid-state reaction. It was shown that the compressibility curve of this powder is characterized by two linear parts at low and middle pressures. The agglomeration strength of the powder was about 142 MPa. The densification of composites started at 1000 °C. The relative density and grain size of sintered Al 2O 3–0.75 mol Y 2O 3 were measured to be 96% and 650 nm at 1500 °C, respectively. TEM results showed a sub-micronic/nano microstructure is formed. The amount of Y 2O 3 had a strong effect on the sintering behavior and final microstructure of nanocomposite powders and it inhibited alumina grain growth and suppressed densification process.
Published Version
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