Polycrystalline yttrium aluminum garnet fibers from colloidal sols

Journal Article · Tue Aug 01 04:00:00 EDT 1995 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1995.tb08626.x· OSTI ID:106008

King, B H; Halloran, J W ^[1]

---

1. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Materials Science and Engineering

Polycrystalline yttrium aluminum garnet (YAG) fibers were prepared from commercially available colloidal sols of Y{sub 2}O{sub 3} and AlOOH and water-soluble polymers. The fibers were dry spun and all processing was performed in air. Transformation to YAG was complete by {approx_equal}1,300 C, and the fibers were mostly dense by 1,600 C with a final fired diameter of 120 {micro}m. A bend test was used to characterize mechanical strength, and an average of 522{+-}186 MPa with a Weibull modulus of 3.5 was determined. The bend stress relaxation (BSR) test was used to characterize creep properties. The creep resistance was better than that of all commercially available oxide fibers with the exception of Saphikon single-crystal alumina (c-axis oriented). The creep strain of the YAG fibers compared well with that calculated for YAG monoliths with roughly the same grain size.

• Sponsoring Organization: USDOE
• OSTI ID: 106008
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 8 Vol. 78; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
36 MATERIALS SCIENCE
ALUMINIUM OXIDES
CREEP
FABRICATION
FLEXURAL STRENGTH
GAS TURBINES
MATERIALS
PHASE STUDIES
POLYMERS
SOLS
STRESS RELAXATION
X-RAY DIFFRACTION
YTTRIUM OXIDES