Two Phase Monazite/Xenotime 30LaPO4-70YPO4 Coating of Ceramic Fiber Tows (Postprint)

Abstract

Equiaxed yttrium-lanthanum phosphate nanoparticles (Y(0.7),La(0.3))PO4(dot)0.7H2O were made and used to continuously coat Nextel(Trademark) 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 deg 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.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 2008
Accession Number
ADA480127

Entities

People

  • Emmanuel E. Boakye
  • M. K. Cinibulk
  • P. Mogilevsky
  • Randall S. Hay

Organizations

  • Universal Energy Systems

Tags

Communities of Interest

  • Advanced Electronics
  • Cyber
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Ceramic Fibers
  • Ceramic Matrix Composites
  • Chemistry
  • Differential Thermal Analysis
  • Diffraction
  • Electron Microscopes
  • Electron Microscopy
  • Grain Growth
  • Heat Energy
  • Materials
  • Microscopy
  • Nanoparticles
  • Particles
  • Scanning Electron Microscopy
  • Scattering
  • Thermal Analysis

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.
  • Surface Engineering/Surface Coating Technology.

Technology Areas

  • Biotechnology
  • Microelectronics