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Microstructure and High Temperature Properties of 85% Al2O3-15% SiO2 Fibers

Published online by Cambridge University Press:  15 February 2011

D. M. Wilson ,
S. L. Lieder  and
D. C. Lueneburg
D. M. Wilson
Affiliation:
Metal Matrix Composite Department 3M Co., St. Paul, MN 55144–1000
S. L. Lieder
Affiliation:
Metal Matrix Composite Department 3M Co., St. Paul, MN 55144–1000
D. C. Lueneburg
Affiliation:
Metal Matrix Composite Department 3M Co., St. Paul, MN 55144–1000
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Abstract

A new sol/gel fiber which exhibits exceptional high temperature properties was recently developed at 3M. This fiber has the composition 85% Al2O3-15% SiO2 (85A-15S). High temperature tensile strength and creep properties were measured in the temperature range 1000°C – 1300°C. The creep rate for the 85A-15S fibers was three orders of magnitude less than single phase polycrystalline alumina fibers such as Nextel 610, and 90% of room tensile strength was retained at 1250°C. These exceptional high temperature properties were attributed to a unique, two-phase microstructure consisting of globular and elongated grains of a-Al2O3 and mullite (3Al2O3-2SiO2). The room temperature single filament strength of the 85% Al2O3-15% SiO2 fibers was 2130 MPa, and the elastic modulus was 260 GPa.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 350: Symposium U – Intermetallic Matrix Composites III , 1994 , 89
Copyright
Copyright © Materials Research Society 1994

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