75 Micron YAG-Alumina Eutectic Fiber

Abstract

Crystal growth experiments were conducted to test the application of the Edge-defined Film- fed Growth (EFG*) technique to the growth of 75 mm single crystal yttrium aluminum garnet - alumina eutectic fibers (YAE) as well as off-eutectic and additive-modified eutectic fibers. The additive modifiers were selected to weaken the interface between the YAG and alumina phases and toughen the material. In combination with the off eutectic composition, it was hoped that an in-situ composite would be formed. It was determined that PrAlO4 was the best modifier, of those examined, in regards to crack deflection at the alumina-YAG interface. The CeAl12O19 modified YAE also showed some crack deflection though not as much as the PrAlO4 system. It was also determined that the alumina rich side of the pseudo-binary eutectic produced superior tensile strengths over the YAG rich side but the YAG rich side may produce better creep properties.

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Document Details

Document Type
Technical Report
Publication Date
Jan 14, 1999
Accession Number
ADA360276

Entities

People

  • Joseph M. Collins

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Ceramic Matrix Composites
  • Chemistry
  • Composite Materials
  • Crystals
  • Heat Energy
  • Heat Treatment
  • High Temperature
  • Materials
  • Materials Engineering
  • Materials Processing
  • Materials Science
  • Mechanical Properties
  • Mechanical Working
  • Residual Stress
  • Temperature Gradients
  • Tensile Strength
  • X Rays

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Materials Science and Engineering.
  • Powder metallurgy of Titanium alloys.