NDLI: Heat treatment effects on the tensile properties and microstructures of a sic/rbsn composite in nitrogen

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Heat treatment effects on the tensile properties and microstructures of a sic/rbsn composite in nitrogen

Content Provider	NASA Technical Reports Server (NTRS)
Author	Bhatt, R. T.
Copyright Year	1995
Description	The room-temperature tensile properties and constituent microstructures of a unidirectionally reinforced SiC/reaction bonded silicon nitride (RBSN) composite have been investigated after heat treatments at 1400, 1600, or 1800 C in nitrogen for up to 100 hr. The composite consisted of approximately 24 vol% of aligned 140 micron diameter, continuous length, chemically vapor deposited SiC fibers in an approximately 40% porous silicon nitride matrix. The composites heat treated at 1400 C for up to 100 hr showed elastic modulus, first matrix cracking strength, and ultimate tensile strength values similar to those of the as-fabricated composites, but those heat treated for 1 hr beyond this temperature displayed losses in all three properties. Recrystallization of the SiC fibers, reaction between the carbon-rich interface coating on the fibers and the RBSN matrix, and dissociation of the RBSN matrix are the reasons for the loss of mechanical properties.
File Size	3094398
Page Count	9
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19960002012
Archival Resource Key	ark:/13960/t8bg7md9r
Language	English
Publisher Date	1995-09-01
Access Restriction	Open
Subject Keyword	Nonmetallic Materials Ceramic Matrix Composites Heat Treatment Tensile Tests Silicon Carbides Fiber Composites Modulus of Elasticity Tensile Strength Stress-strain Diagrams Reaction Bonding Temperature Effects Fiber-matrix Interfaces Silicon Nitrides Fracture Strength Microstructure Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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