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Preparation and Performance of Monazite Coating on Woven Alumina Ceramic Cloths

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. Al2O3f/ 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•m1/2.