Alumina reinforced tetragonal zirconia (TZP) composites. [Annual report, February 16, 1994--February 15, 1995]

PDF Version Also Available for Download.

Description

Objective is to develop high-strength and high-toughness ceramic composites by combining mechanisms of platelet, whisker or fiber reinforcement with transformation toughening. The approach being used includes reinforcement of ceria or yttria-partially-stabilized zirconia (CE-TZP or Y-T-ZP) with platelets, whiskers or continuous filaments of alumina. Critical stresses for extension of filament-bridged matrix cracks were measured as a function of crack length in a model composite system, SiC (filament)-reinforced epoxy-alumina (matrix). The crack-length dependence of the crack extension stress at short crack lengths followed the prediction of a fracture-mechanics analysis that employed a new force-displacement law for the crack-bridging filaments developed in this ... continued below

Physical Description

15 p.

Creation Information

Shetty, D.K. April 1, 1995.

Context

This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this report can be viewed below.

Who

People and organizations associated with either the creation of this report or its content.

Author

Sponsor

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

Contact Us

What

Descriptive information to help identify this report. Follow the links below to find similar items on the Digital Library.

Description

Objective is to develop high-strength and high-toughness ceramic composites by combining mechanisms of platelet, whisker or fiber reinforcement with transformation toughening. The approach being used includes reinforcement of ceria or yttria-partially-stabilized zirconia (CE-TZP or Y-T-ZP) with platelets, whiskers or continuous filaments of alumina. Critical stresses for extension of filament-bridged matrix cracks were measured as a function of crack length in a model composite system, SiC (filament)-reinforced epoxy-alumina (matrix). The crack-length dependence of the crack extension stress at short crack lengths followed the prediction of a fracture-mechanics analysis that employed a new force-displacement law for the crack-bridging filaments developed in this study. At large crack lengths, the measured matrix-cracking stress was close to the prediction of the steady-state theory of Budiansky, Hutchinson and Evans. Optical fluorescence was employed to measure stresses in crack-bridging sapphire filaments and assess interfacial properties in a model sapphire-epoxy composite. Composites of yttria-partially-stabilized zirconia (Y-TZP) matrix dispersed with either single crystal A1{sub 2}0{sub 3} platelets or particulars were fabricated by a hybrid suspension/powder processing route to densities greater than 99.0% of theoretical. Both transformation toughening and platelet reinforcement contribute to the high fracture toughness of the A1{sub 2}0{sub 3} (platelet)-Y-TZP composites.

Physical Description

15 p.

Notes

OSTI as DE95008990

Source

  • Other Information: PBD: [1995]

Language

Item Type

Identifier

Unique identifying numbers for this report in the Digital Library or other systems.

  • Other: DE95008990
  • Report No.: DOE/ER/45312--7
  • Grant Number: FG02-87ER45312
  • DOI: 10.2172/34447 | External Link
  • Office of Scientific & Technical Information Report Number: 34447
  • Archival Resource Key: ark:/67531/metadc683520

Collections

This report is part of the following collection of related materials.

Office of Scientific & Technical Information Technical Reports

What responsibilities do I have when using this report?

When

Dates and time periods associated with this report.

Creation Date

  • April 1, 1995

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

Description Last Updated

  • Nov. 18, 2015, 12:09 p.m.

Usage Statistics

When was this report last used?

Yesterday: 0
Past 30 days: 0
Total Uses: 6

Interact With This Report

Here are some suggestions for what to do next.

Start Reading

PDF Version Also Available for Download.

Citations, Rights, Re-Use

Shetty, D.K. Alumina reinforced tetragonal zirconia (TZP) composites. [Annual report, February 16, 1994--February 15, 1995], report, April 1, 1995; United States. (digital.library.unt.edu/ark:/67531/metadc683520/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.