Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

Characterization and control of the fiber-matrix interface in ceramic matrix composites

Technical Report ·
DOI:https://doi.org/10.2172/6855809· OSTI ID:6855809

Fiber-reinforced SiC composites fabricated by thermal-gradient forced-flow chemical-vapor infiltration (FCVI) have exhibited both composite (toughened) and brittle behavior during mechanical property evaluation. Detailed analysis of the fiber-matrix interface revealed that a silica layer on the surface of Nicalon Si-C-O fibers tightly bonds the fiber to the matrix. The strongly bonded fiber and matrix, combined with the reduction in the strength of the fibers that occurs during processing, resulted in the observed brittle behavior. The mechanical behavior of Nicalon/SiC composites has been improved by applying thin coatings (silicon carbide, boron, boron nitride, molybdenum, carbon) to the fibers, prior to densification, to control the interfacial bond. Varying degrees of bonding have been achieved with different coating materials and film thicknesses. Fiber-matrix bond strengths have been quantitatively evaluated using an indentation method and a simple tensile test. The effects of bonding and friction on the mechanical behavior of this composite system have been investigated. 167 refs., 59 figs., 18 tabs.

Research Organization:
Oak Ridge National Lab., TN (USA)
Sponsoring Organization:
DOE/FE
DOE Contract Number:
AC05-84OR21400
OSTI ID:
6855809
Report Number(s):
ORNL/TM-11039; ON: DE91000922
Country of Publication:
United States
Language:
English

Similar Records

Characterization of fiber-matirx interfaces in ceramic composites
Conference · Thu Dec 31 23:00:00 EST 1987 · OSTI ID:6703635
The effect of fiber coatings on interfacial shear strength and the mechanical behavior of ceramic composites
Conference · Sat Dec 31 23:00:00 EST 1988 · OSTI ID:7072317
The influence of the fiber-matrix bond on the mechanical behavior of NICALON/SiC composites
Technical Report · Mon Nov 30 23:00:00 EST 1987 · OSTI ID:5484726

Related Subjects

01 COAL, LIGNITE, AND PEAT
010400* -- Coal
Lignite
& Peat-- Processing
014000 -- Coal
Lignite
& Peat-- Combustion
36 MATERIALS SCIENCE
360602 -- Other Materials-- Structure & Phase Studies
360603 -- Materials-- Properties
BORON
BORON COMPOUNDS
BORON NITRIDES
CARBIDES
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CERAMICS
COAL
COATINGS
COMPOSITE MATERIALS
CONVERSION
CRYSTAL STRUCTURE
DEPOSITION
ELEMENTS
ENERGY SOURCES
FABRICATION
FOSSIL FUELS
FRICTION
FUELS
INTERFACES
MATERIALS
MECHANICAL PROPERTIES
METALS
MICROSTRUCTURE
MOLYBDENUM
NITRIDES
NITROGEN COMPOUNDS
PNICTIDES
PROTECTIVE COATINGS
REINFORCED MATERIALS
SEMIMETALS
SILICON CARBIDES
SILICON COMPOUNDS
TENSILE PROPERTIES
TRANSITION ELEMENTS