Mechanical Properties of SiC Fiber-Reinforced Reaction-Bonded Si3N4 Composites.

Abstract

The room temperature mechanical and physical properties of silicon carbide fiber-reinforced reaction-bonded silicon nitride composites (SiC/RBSN) have been evaluated. The composites contained similiar to 23 and similiar to 40 volume fraction of aligned 140 micron diameter chemically vapor deposited SiC fibers. Preliminary results for composites tensile and bend strengths and fracture strain indicate that the composites displayed excellent properties when compared with unreinforced RBSN of comparable porosity. Fiber volume fraction showed little influence on matrix first cracking strain did influence the stresses required for matrix first cracking and for ultimate composite fracture strength. It is suggested that by reducing matrix porosity and by increasing the volume fraction of the large diameter SiC fiber, it should be possible to further improve the composite stress at which the matrix first cracks. Keywords: Ceramic powders; Composite fabrication; Microstructure; Density; Axial bend and tensile; Strength; and Integrated shear strength.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1985
Accession Number
ADA160622

Entities

People

  • R. T. Bhatt

Organizations

  • National Aeronautics and Space Administration

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Army Aviation
  • Ceramic Materials
  • Ceramic Matrix Composites
  • Chemical Vapor Deposition
  • Composite Material Fabrication
  • Composite Materials
  • Fabrication
  • Failure Mode And Effect Analysis
  • Fibers
  • Materials
  • Materials Processing
  • Mechanical Properties
  • Metal Matrix Composites
  • Physical Properties
  • Silicon Carbide
  • Stresses
  • Tensile Strength

Fields of Study

  • Materials science

Readers

  • Reinforced Composite Materials