Heat Treatment Effects on the Tensile Properties and Microstructures of a SiC/RBSN Composite in Nitrogen.

Abstract

The room-temperature tensile properties and constituent microstructures of a unidirectionally reinforced SiC/RBSN composite have been investigated after heat treatments at 1400, 1600, or 1800 deg C in nitrogen for up to 100 hr. The composite consisted of approx. 24 vol% of aligned 140 micrometers diameter, continuous length, chemically vapor deposited SiC fibers in a approx. 40% porous silicon nitride matrix. The composites heat treated at 1400 deg 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. jg p2

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1995
Accession Number
ADA303864

Entities

People

  • R. T. Bhatt

Organizations

  • Glenn Research Center

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Ceramic Materials
  • Composite Material Fabrication
  • Composite Materials
  • Diameters
  • Heat Energy
  • Heat Treatment
  • Materials
  • Mechanical Properties
  • Mechanical Working
  • Microstructure
  • Modulus Of Elasticity
  • Nitrogen
  • Stress Strain Relations
  • Stresses
  • Tensile Properties
  • Tensile Strength
  • Tensile Testing

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.
  • Reinforced Composite Materials