Preparation and Performance of Monazite Coating on Woven Alumina Ceramic Cloths

Abstract:

Monazite (LaPO₄) coatings were deposited on woven cloths of alumina fibers by heterogeneous nucleation and growth using solution precursors. Coatings were characterized by scanning electron microscopy, and X-Ray diffraction; thermogravimetric analysis was performed on LaPO₄ precursors. The results show that the optimum ration of La:citrate:P is 1:2:5 in the LaPO₄ precursor solution. Coating thickness distributions were measured and analyzed. Uniform monazite coatings (210-250nm) were obtained after depositing in the precursor solution, drying and heating at 900°C for 5 min for 6 recycles. Al₂O_3f/ Al₂O₃ composite with the LaPO₄coating as the CMC interface revealed goodmechanical strength and the fracture mode is ductile fracture. The tensile toughness is 142.2 MPa, the bending toughness is 288.6MPa and the fracture toughness12.2 MPa•m^1/2.

• Periodical: Key Engineering Materials (Volume 697)
• Pages: 333-336
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.697.333
• Online since: July 2016
• Authors: Yan Yuan Liang*, Guang Ya Li
• Keywords: Al₂O_3f/Al₂O₃, Coating, Monazite

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