Mechanical properties of beta-silicon nitride whisker/silicon nitride matrix composites. Technical report

Technical Report · Thu Jun 01 04:00:00 EDT 1989

OSTI ID:5360772

Neergaard, L J; Homeny, J

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.

• Research Organization: National Center for Composite Materials Research, Urbana, IL (United States)
• OSTI ID: 5360772
• Report Number(s): AD-A-234207/9/XAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
BRIDGES
BRITTLENESS
COMPOSITE MATERIALS
CRACK PROPAGATION
CRACKS
CRYSTALS
ENGINES
FAILURES
FRACTURE PROPERTIES
HEAT ENGINES
HIGH TEMPERATURE
MATERIALS
MECHANICAL PROPERTIES
MECHANICAL STRUCTURES
MONOCRYSTALS
NITRIDES
NITROGEN COMPOUNDS
PNICTIDES
RELIABILITY
SILICON COMPOUNDS
SILICON NITRIDES
STRESSES
USES
WHISKERS