SYMPOSIA PAPER Published: 01 January 2000

Degradation of Continuous Fiber Ceramic Matrix Composites under Constant Load Conditions


Ten different ceramic matrix composite (CMC) materials were subjected to a constant load and temperature in an air environment. Tests conducted under these conditions are often referred to as stressed oxidation or creep rupture tests. The stressed oxidation tests were conducted at a temperature of 1454°C at stresses of 69 MPa, 172 MPa and 50% of each material's ultimate tensile strength. The ten materials included such CMCs as C/SiC, SiC/C, SiC/SiC, SiC/SiNC and C/C. The time to failure results of the stressed oxidation tests will be presented. Much of the discussion regarding material degradation under stressed oxidation conditions will focus on C/SiC composites. Thermogravimetric analysis of the oxidation of fully exposed carbon fiber (T300) and of C/SiC coupons will be presented as well as a model that predicts the oxidation patterns and kinetics of carbon fiber tows oxidizing in a nonreactive matrix.

Author Information

Halbig, MC
U.S. Army Research Laboratory, Vehicle Technology Directorate, Cleveland, OH
Brewer, DN
NASA Glenn Research Center, Cleveland, OH
Eckel, AJ
NASA Glenn Research Center, Cleveland, OH
Price: $25.00
Contact Sales
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Developed by Committee: C28
Pages: 290–305
DOI: 10.1520/STP15021S
ISBN-EB: 978-0-8031-5440-7
ISBN-13: 978-0-8031-2872-9