Microstructural and Strength Stability of CVD SiC Fibers in Argon Environment.

Abstract

The room temperature tensile strength and microstructure of three types of commercially available chemically vapor deposited silicon carbide fibers were measured after 1, 10, and 100 hr heat-treatments under argon pressures of 0.1 to 310 MPa at temperatures to 2100 deg C. Two types of fiber had carbon-rich surface coatings and the other contained no coating. All three fiber types showed strength degradation beyond 1400 deg C. Time and temperature of exposure had greater influence on strength degradation than argon pressure. Recrystallization and growth of near-stoichiometric SiC grains appears to be the dominant mechanism for the strength degradation.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1991
Accession Number
ADA240435

Entities

People

  • David R. Hull
  • Ramakrishna T. Bhatt

Organizations

  • National Aeronautics and Space Administration

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Army Aviation
  • Ceramic Materials
  • Chemical Vapor Deposition
  • Composite Materials
  • Environment
  • Fabrication
  • Flexural Strength
  • Grain Growth
  • Heat Treatment
  • Materials
  • Materials Processing
  • Materials Testing
  • Mechanical Properties
  • Silicon Carbide
  • Technical Ceramics
  • Tensile Strength
  • X Rays

Fields of Study

  • Materials science

Readers

  • Metallurgy
  • Reinforced Composite Materials
  • Thin Film Deposition Science.