Creep-Resistance of Developmental Polycrystalline Yttrium-Aluminum Garnet Fibers

Morscher, Gregory N.; Chen, K. C.; Mazdiyasni, K. S.

doi:10.1002/9780470314500.ch21

Cited by 47 publications

(9 citation statements)

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“…[1][2][3][4][5] Unfortunately, the conventional mixed oxide process requires high temperature (∼2000°C) and lengthy heat treatment to obtain phase-pure YAG. Therefore, wet chemical processes have been used for producing YAG as a powder or fiber.…”

Section: Introductionmentioning

confidence: 99%

A Simple Way to Synthesize Yttrium Aluminum Garnet by Dissolving Yttria Powder in Alumina Sol

Han

Koo

Lim

1999

Journal of the American Ceramic Society

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A precursor for Y 3 Al 5 O 12 was synthesized as a YAG sol by simply dissolving Y 2 O 3 powder in an alumina sol. Phasepure Y 3 Al 5 O 12 powder was obtained by precipitating the YAG sol with an aqueous dilute ammonia solution followed by calcination at 1100°C. TG/DTA analysis showed an exotherm at 938°C attributed to formation of YAG phase and weight loss of 44% at 1000°C. XRD and FT-IR analysis showed that phase-pure YAG can be formed through noncrystalline and metastable hexagonal YAlO 3 without forming either yttrium or aluminum formate intermediate.

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Section: Introductionmentioning

confidence: 99%

A Simple Way to Synthesize Yttrium Aluminum Garnet by Dissolving Yttria Powder in Alumina Sol

Han

Koo

Lim

1999

Journal of the American Ceramic Society

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“…The failure strength is relatively low, i.e., 1000 MPa for small diameter fibers (15-30 IJm) with a grain size of~1 IJm [108] and 500-600 MPa for fibers of larger diameters (100 -120 IJm). Young's modulus for these fibers is assumed to be that ofbulk YAG, i.e., 283 GPa.…”

Section: Properties and Applicationsmentioning

confidence: 99%

“…YAG fibers can also be produced from organometallic precursors, such as carboxylate precursors [106] oralkoxides [108], with the advantage that the yttrium and aluminum bearing species are mixed at the molecular level. For example, yttrium and aluminum isobutyrates, Y(ChCRh and AI(02CRh with R=i -CH2(CH2h, are mixed in the Y/AI =3/5stoichiometry, and dissolved in tetrahydrofuran.…”

Section: (B) From Polymer Precursorsmentioning

confidence: 99%

Advanced Inorganic Fibers

Wallenberger¹,

Naslain²,

MacChesney³

et al. 1999

Materials Technology Series

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“…22,24,25,[42][43][44][45][46][47][48][49] These are typically fine diameter (~15 µm) fibers extruded in the green state from YAG preceramic sols or solutions with the appropriate rheology. Bend strengths of 0.9 to 1.7 GPa for coarse-grained polycrystalline YAG fiber (grain sizes > 1 µm) have been demonstrated 23 , although most efforts have not made anything close to that strength.…”

Section: Polycrystalline Optical Quality Yagmentioning

confidence: 99%

Towards optical quality yttrium aluminum garnet (YAG) fibers: recent efforts at AFRL/RX

et al. 2010

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Traditional silica fibers currently are unlikely to be able to sustain the powers needed for future Air Force applications. The low thermal conductivity of silica makes it difficult to control thermal gradients within the fibers resulting in failure or degradation in beam quality. While some of these problems can be ameliorated by using longer fibers, this results in problems with nonlinear effects such as stimulated Raman and Brillouin scattering (SRS and SBS). Yttrium aluminum garnet (Y 3 Al 5 O 12 , YAG) has the potential for overcoming these problems due to 1) higher thermal conductivity, 2) reduced thermal lensing, and 3) higher SBS threshold. Polycrystalline YAG has been demonstrated to be a highly efficient and economical laser host material in slab form. Polycrystalline YAG can be doped more uniformly and at higher levels than single-crystals with no dopant loss by zone refinement, has higher fracture toughness than single-crystals, and supports higher power densities. Despite the anticipated advantages, polycrystalline YAG has never been demonstrated in high-power fiber lasers. The development and characterization of YAG fibers for high energy laser applications is the primary goal of our research. Recent results in the processing of optical quality polycrystalline YAG fibers will be presented and discussed.

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Creep-Resistance of Developmental Polycrystalline Yttrium-Aluminum Garnet Fibers

Cited by 47 publications

References 0 publications

A Simple Way to Synthesize Yttrium Aluminum Garnet by Dissolving Yttria Powder in Alumina Sol

A Simple Way to Synthesize Yttrium Aluminum Garnet by Dissolving Yttria Powder in Alumina Sol

Advanced Inorganic Fibers

Towards optical quality yttrium aluminum garnet (YAG) fibers: recent efforts at AFRL/RX

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