The mechanical properties of a novel Si[sub 3]N[sub 4]-amorphous Si[sub 3]N[sub 4] composite

Conference · Wed Jan 01 04:00:00 EST 1992

OSTI ID:6901714

Reimanis, I E; Petrovic, J J; Suematsu, H; Mitchell, T E ^[1]; Leung, O S ^[2]

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1. Los Alamos National Lab., NM (United States)
2. California Univ., Berkeley, CA (United States). Dept. of Materials Science and Engineering

The hardness and fracture toughness of a model two-phase composite consisting of crystalline Si[sub 3]N[sub 4] particles in a matrix of amorphous Si[sub 3]N[sub 4] are examined. The composite is created by beat treating high purity, partially amorphous CVD Si[sub 3]N[sub 4] in N[sub 2] for various times and temperatures in order to induce crystallization of the [alpha] phase. Microindentation tests at temperatures up to 1200C are conducted to evaluate the high-temperature hardness and fracture toughness. The role of the microstructure is examined using optical and transmission electron microscopy. Finally, the relation between microstructure and the mechanical properties is discussed.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6901714
• Report Number(s): LA-UR-92-4276; CONF-921101--55; ON: DE93005473
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360603 -- Materials-- Properties
AMORPHOUS STATE
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
FRACTURE PROPERTIES
MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NITRIDES
NITROGEN COMPOUNDS
PNICTIDES
SILICON COMPOUNDS
SILICON NITRIDES
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
VICKERS HARDNESS