Two Phase Monazite/Xenotime 30LaPO4-70YPO4 Coating of Ceramic Fiber Tows
E. E. Boakye, R. S. Hay,
P. Mogilevsky,
M. K. Cinibulk,
R. S. Hay
Air Force Research Laboratory, Materials and Manufacturing Directorate (AFRL/MLLN), Wright-Patterson Air Force Base, Ohio 45433
Search for more papers by this authorP. Mogilevsky
Search for more papers by this authorM. K. Cinibulk
Search for more papers by this authorE. E. Boakye, R. S. Hay,
P. Mogilevsky,
M. K. Cinibulk,
R. S. Hay
Air Force Research Laboratory, Materials and Manufacturing Directorate (AFRL/MLLN), Wright-Patterson Air Force Base, Ohio 45433
Search for more papers by this authorP. Mogilevsky
Search for more papers by this authorM. K. Cinibulk
Search for more papers by this author The American Ceramic Society,
The American Ceramic Society
Search for more papers by this authorBook Author(s): The American Ceramic Society,
The American Ceramic Society
Search for more papers by this authorSummary
Equiaxed yttrium-lanthanum phosphate nanoparticles PO4 • 0.7H20 were made and used to continuously coat Nextel™ 720 fiber tows. The particles were precipitated from a mixture of yttrium and lanthanum citrate chelate and phosphoric acid (H3PO4), and characterized with differential thermal analysis and thermogravimetric analysis, X-ray diffraction, transmission electron microscopy, and scanning electron microscopy. The coated fibers were heat treated at 1000°-1300°C for 1, 10, and 100 h. Coating grain growth kinetics and coated fiber strengths were determined and compared with equiaxed La-monazite coatings. The relationships between coating porosity, coating hermeticity, and coated fiber strength are discussed. The formation, characterization, and possible benefits of two-phase monazite/xenotime continuous fiber coatings of P04 bulk composition are reported. Rare-earth phosphates such as monazite, can be synthesized by a variety of wet chemical methods.
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