Document Type

Conference Proceeding

Publication Date

11-2-2015

Abstract

Creep behavior in interlaminar shear of a non-oxide ceramic composite with a multilayered matrix was investigated at 1200C in laboratory air and in steam environment. The composite was produced via chemical vapor infiltration (CVI). The composite had an oxidation inhibited matrix, which consisted of alternating layers of silicon carbide and boron carbide and was reinforced with laminated Hi-NicalonTM fibers woven in a five-harness-satin weave. Fiber preforms had pyrolytic carbon fiber coating with boron carbon overlay applied. The interlaminar shear properties were measured. The creep behavior was examined for interlaminar shear stresses in the 16–22 MPa range. Primary and secondary creep regimes were observed in all tests conducted in air and in steam. In air and in steam, creep run-out defined as 100 h at creep stress was achieved at 16 MPa. Similar creep strains were accumulated in air and in steam. Furthermore, creep strain rates and creep lifetimes were only moderately affected by the presence of steam. The retained properties of all specimens that achieved run-out were characterized. Composite microstructure, as well as damage and failure mechanisms were investigated. The tested specimens were also examined using electron probe microanalysis (EPMA) with wavelength dispersive spectroscopy (WDS). Analysis of the fracture surfaces revealed significant surface oxidation, but only trace amounts of boron and carbon. Cross sectional analysis showed increasing boron concentration in the specimen interior.

Comments

Sourced from the version at MATEC Web of Conferences:

Ruggles-Wrenn, M., & Pope, M. (2015). Creep behavior in interlaminar shear of a Hi-Nicalon TM / SiC-B 4 C composite at 1200C in air and in steam. In E. Baranger & J. Lamon (Eds.), Testing and Modeling Ceramic & Carbon Matrix Composites (MATEC Web of Conferences, Vol. 29, Article 00006). https://doi.org/10.1051/matecconf/20152900006

© Owned by the authors, published by EDP Sciences, 2015.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/)

DOI

10.1051/matecconf/20152900006

Source Publication

MATEC Web of Conferences

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