Accession Number:

ADA234207

Title:

Mechanical Properties of Beta-Silicon Nitride Whisker/Silicon Nitride Matrix Composites

Descriptive Note:

Technical rept.

Corporate Author:

NATIONAL CENTER FOR COMPOSITE MATERIALS RESEARCH URBANA IL

Personal Author(s):

Report Date:

1989-06-01

Pagination or Media Count:

36.0

Abstract:

Whisker reinforced ceramic matrix composites have received a great deal of attention for applications as high temperature structural materials in, for example, advanced heat engines and high temperature energy conversion systems. For these applications, where mechanical reliability is critical, the improvements that can be realized in fracture stress and fracture toughness by the addition of whiskers to polycrystalline ceramics are of great interest. The primary role of the whisker reinforcement is to prevent catastrophic brittle failure by activating mechanisms that dissipate energy during crack propagation. Relevant toughening mechanisms include whisker bridging, whisker pullout, crack deflection, and microcrack formation.

Subject Categories:

  • Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE