Alumina reinforced tetragonal zirconia (TZP) composites

Technical Report · Mon Dec 31 23:00:00 EST 1990

OSTI ID:5517571

Shetty, D K

This progress report/continuation proposal summarizes the highlights of research results obtained in the past year in the DOE-supported research project entitled, Alumina Reinforced Tetragonal Zirconia (TZP) Composites'' and proposes additional research to be conducted during the period July 1, 1991 through June 30, 1992. Several significant research results were obtained in the past year: (1) The role of MnO additive in grain growth kinetics, phase stability and transformation toughening of Ce-TZP/Al{sub 2}O{sub 3} composites was established. (2) It was shown that the monotonic and homogeneous transformation plasticity obtained in the Ce-TZP/Al{sub 2}O{sub 3} composite led to crack-tip transformation zones more efficient in zone shielding than similar commercial grades. (3) A method for evaluating rising crack-growth-resistance behavior (R-Curve) of toughened ceramics based on stable crack growth measurements was demonstrated and shown to be superior to current techniques based on strength measurements. (4) A nonlinear shear-lag model developed for assessing fiber-matrix interfacial sliding friction was employed to analyze single filament pullout and pushout tests on model SiC-borosilicate glass composites. The two tests gave identical sliding friction coefficient and residual clamping stress only when the Poisson contraction/expansion of the filaments in the pullout and the pushout tests, respectively, were taken into account via the new shear-lag theory.

• Research Organization: Utah Univ., Salt Lake City, UT (United States). Dept. of Materials Science and Engineering
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-87ER45312
• OSTI ID: 5517571
• Report Number(s): DOE/ER/45312-4; ON: DE91016748
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360601 -- Other Materials-- Preparation & Manufacture
360602 -- Other Materials-- Structure & Phase Studies
360603* -- Materials-- Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BONDING
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
COMPOSITE MATERIALS
CRACK PROPAGATION
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DOCUMENT TYPES
FABRICATION
FIBERS
FRICTION
JOINING
MANGANESE COMPOUNDS
MANGANESE OXIDES
MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PLASTICITY
PROCESSING
PROGRESS REPORT
RARE EARTH COMPOUNDS
SLIDING FRICTION
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES