Novel Method for Cost-Effective Manufacturing of Single Crystal YAG Fibers from Nanosize Particles

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: F49620-02-C-0016
Agency Tracking Number: F013-0097
Amount: $99,999.00
Phase: Phase I
Program: STTR
Awards Year: 2002
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Materials Modification, Inc.
2721-D Merrilee Drive, Fairfax, VA, 22031
DUNS: 167433531
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Arun Sampath
 Materials Engineer
 (703) 560-1371
 asampath@matmod.com
Business Contact
 T.S. Sudarshan
Title: Vice President and COO
Phone: (703) 560-1371
Email: sudarshan@matmod.com
Research Institution
 University of Illinois
 Tony G Waldrop
 c/o Grants & Contracts, 801 South Wright Street
Champaign, IL, 61820
 (217) 333-2187
 Nonprofit college or university
Abstract
"Yttrium-aluminum garnet (YAG) single crystal fibers, 50 micron in diameter, of 100% Y3Al5O12 (YAG) composition, having either [111] or [001] orientations along the axis the fibers, will be fabricated utilizing a novel, versatile approach based on theTemplated Grain Growth of Seeded Nanoparticles (TGGSN) method. Nanocrystalline powders of YAG will be synthesized and dispersed in organic binders and seeded with small elongated single crystals of YAG of [111] or [001] orientations, 10 to 20 microns insmallest dimension and an aspect ratio of 50 to 100 (1 to 2 mm). Continuous fibers will be spun from the seeded suspensions to produce ~50%-dense nanoparticle fibers containing the elongated single crystals oriented along the fiber axis. The pre-cursorfibers will undergo a series of heat treating steps to remove the binder, sinter the nanosize particles into a fully-dense nanograin material, and then, by using unique sintering facilities at the University of Illinois, induce the Templated Grain Growthprocess, during which the large oriented single crystals will grow along the axis of the fibers by consuming the nanosize particles.The resulting single crystal YAG fibers are expected to be a major step in the development of YAG fiber-based composites,because their small diameter should make them amenable to weaving, which is currently impossible with commercially-available YAG fibers of >100 micron diameter. In addition, the TGGSN approach is inherently very economical, as opposed to theprohibitively expensive Edge-Defined Growth method that is the only currently available method for manufacturing YAG fibers."

* information listed above is at the time of submission.

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