Influence of synthesis parameters on phase evolution and micromorphology of lanthanum hexaaluminate
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Lanthanum hexaaluminate is a potential candidate for thermal barrier coatings due to its unique lamellar structure andexcellent thermophysical properties. In this work, lanthanum hexaaluminate was prepared by a solid-state reaction synthesisat 1600 oC, and the effects of aluminum source type and molding method on the phase composition and microstructure of thepowder were studied. It can be seen that the synthesis efficiency of alumina as aluminium source is higher than that ofaluminium hydroxide. However, the flake structure is more obvious when aluminium hydroxide is used to synthesizealuminium hydroxide. In addition, the process of compacting green compact can effectively improve the synthesis efficiencyof LaAl11O18, but it will also affect the formation and growth of grains. Consequently, a high yield of LaAl11O18 powder witha particle size of 3 μm and aspect ratio of 9.88 can be obtained by compacting aluminum hydroxide as the aluminum source.
Abstract
Lanthanum hexaaluminate is a potential candidate for thermal barrier coatings due to its unique lamellar structure andexcellent thermophysical properties. In this work, lanthanum hexaaluminate was prepared by a solid-state reaction synthesisat 1600 oC, and the effects of aluminum source type and molding method on the phase composition and microstructure of thepowder were studied. It can be seen that the synthesis efficiency of alumina as aluminium source is higher than that ofaluminium hydroxide. However, the flake structure is more obvious when aluminium hydroxide is used to synthesizealuminium hydroxide. In addition, the process of compacting green compact can effectively improve the synthesis efficiencyof LaAl11O18, but it will also affect the formation and growth of grains. Consequently, a high yield of LaAl11O18 powder witha particle size of 3 μm and aspect ratio of 9.88 can be obtained by compacting aluminum hydroxide as the aluminum source.
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