Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 68, Issue -, Pages 19-28Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2014.09.013
Keywords
Ceramic-matrix composites (CMCs); Fracture toughness; High-temperature properties
Funding
- German Federal Ministry of Education and Research (BMBF)
Ask authors/readers for more resources
Mechanical performance of three oxide/oxide ceramic matrix composites (CMCs) based on Nextel 610 fibers and SiOC, alumina, and mullite/SiOC matrices respectively, is evaluated herein. Tensile strength and stiffness of all materials decreased at 1000 degrees C and 1200 degrees C, probably because of degradation of fiber properties beyond 1000 degrees C. Microstructural changes in the composites during exposure at 1000 degrees C and 1200 degrees C for 50 h reduce their flexural strength, fracture toughness and work of fracture. A literature review regarding mechanical properties of several oxide/oxide CMCs revealed lower influence of fiber properties on composite strength compared with elastic modulus. The tested composites exhibit comparable stiffness and strength but higher fracture toughness compared with average values determined from a literature review. Considering CMCs with different compositions, we observed an interesting linear trend between strength and fracture toughness. The validity of the linear relationship between fracture strength and flexural toughness for CMCs is discussed. (C) 2014 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available