Microstructure and short-term oxidation of hot-pressed Si sub 3 N sub 4 /ZrO sub 2 (Y sub 2 O sub 3 ) ceramics

Journal Article · Wed Jan 01 04:00:00 EST 1992 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1992.tb05437.x· OSTI ID:5574475

Falk, L K.L. ^[1]; Rundgren, K ^[2]

---

1. Dept. of Physics, Chalmers Univ. of Technology, S-412 96 Goeteborg (SE)
2. Swedish Ceramic Inst., S-402 29 Goeteborg (SE)

This paper reports on composite ceramic materials based on Si{sub 3}N{sub 4} and ZrO{sub 2} stabilized by 3 mol % Y{sub 2}O{sub 3} that have been formed using aluminum isopropoxide as a precursor for the Al{sub 2}O{sub 3} sintering aid. Densification was carried out by hot-pressing at temperatures in the range 1650{degrees} to 1800{degrees} C, and the resulting microstructures were related to mechanical properties as well as to oxidation behavior at 1200{degrees} C. Densification at the higher temperatures resulted in a fibrous morphology of the Si{sub 3}N{sub 4} matrix with consequent high room-temperature toughness and strength. Decomposition of the ZrO{sub 2} grains below the oxidized surface during oxidation introduced radial stresses in the subscalar region, and from the oxidation experiments it is suggested that the ZrO{sub 2} incorporated some N during densification.

• OSTI ID: 5574475
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 75:1; ISSN 0002-7820; ISSN JACTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360205 -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
CHALCOGENIDES
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
DATA
EXPERIMENTAL DATA
FABRICATION
HEAT RESISTANT MATERIALS
HOT PRESSING
INFORMATION
MATERIALS
MATERIALS WORKING
MECHANICAL PROPERTIES
MICROSTRUCTURE
NITRIDES
NITROGEN COMPOUNDS
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHASE STABILITY
PNICTIDES
PRESSING
SILICON COMPOUNDS
SILICON NITRIDES
STABILITY
TRANSITION ELEMENT COMPOUNDS
YIELD STRENGTH
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES