Tetragonal zirconia polycrystals reinforced with SiC whiskers

Journal Article · Sat Mar 01 04:00:00 EST 1986 · J. Am. Ceram. Soc.; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1986.tb07429.x· OSTI ID:5850920

Claussen, N; Weisskopf, K L; Ruhle, M

The microstructure and the mechanical properties of hot-pressed tetragonal ZrO/sub 2/ polycrystals (TZP) reinforced with up to 30 vol% SiC whiskers were studied. The SiC whisker-TZP composites were stable under the hot-pressing conditions at 1450/sup 0/C. Annealing in an oxidizing atmosphere at approx. =1000/sup 0/C resulted in glass formation and microcracking caused by whisker oxidation and transformation of the ZrO/sub 2/ grains near the whiskers to monoclinic symmetry. The fracture toughness was markedly improved by the dispersed whiskers (approx. =12 MPa.m/sup 1/2/ at 30 vol% SiC) compared to the values measured for the matrix (approx. = MPa.m/sup 1/2/) The flexural strength of the hot-pressed TZP-30 vol% SiC whisker composite at 1000/sup 0/C (approx. =400 MPa) was twice that of the TZP matrix.

• Research Organization: Technische Universitat Hamburg-Harburg, Arbeitsbereich Keramik, D 2100 Hamburg 90
• OSTI ID: 5850920
• Journal Information: J. Am. Ceram. Soc.; (United States), Journal Name: J. Am. Ceram. Soc.; (United States) Vol. 69:3; 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
ANNEALING
CARBIDES
CARBON COMPOUNDS
CERAMICS
CHALCOGENIDES
CHEMICAL REACTIONS
CRACK PROPAGATION
CRYSTAL STRUCTURE
CRYSTALS
FABRICATION
FRACTURE PROPERTIES
GLASS
HEAT TREATMENTS
HIGH PRESSURE
HOT PRESSING
MATERIALS
MATERIALS WORKING
MECHANICAL PROPERTIES
MICROSTRUCTURE
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POLYCRYSTALS
PRESSING
REINFORCED MATERIALS
SILICON CARBIDES
SILICON COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VERY HIGH PRESSURE
VERY HIGH TEMPERATURE
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES