New ceramics containing dispersants for improved fracture toughness
Abstract
The invention is a ceramic composition containing a new class of dispersant for hindering crack propagation by means of one or more energy-dissipative mechanisms. The composition is composed of a ceramic matrix with dispersed particles of a transformation-prone rare-earth niobate, tantalate or mixtures of these with each other and/or with a rare-earth vanadate. The dispersants, having a generic composition tRBO/sub 4/, where R is a rare-earth element, B if Nb or Ta and O is oxygen, are mixed in powder form with a powder of the matrix ceramic and sintered to produce a ceramic form or body. The crack-hindering mechanisms operates to provide improved performance over a wide range of temperature and operating conditions.
- Inventors:
- Issue Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- OSTI Identifier:
- 5459744
- Application Number:
- ON: DE86013699
- Assignee:
- Dept. of Energy
- DOE Contract Number:
- W-31-109-ENG-38
- Resource Type:
- Patent
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; CERAMICS; DISPERSION HARDENING; ADDITIVES; CRACK PROPAGATION; FRACTURE PROPERTIES; NIOBATES; RARE EARTH COMPOUNDS; TANTALATES; VANADATES; VERY HIGH TEMPERATURE; HARDENING; MECHANICAL PROPERTIES; NIOBIUM COMPOUNDS; OXYGEN COMPOUNDS; REFRACTORY METAL COMPOUNDS; TANTALUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; VANADIUM COMPOUNDS; 360203* - Ceramics, Cermets, & Refractories- Mechanical Properties
Citation Formats
Nevitt, M V, Aldred, A T, and Chan, Sai-Kit. New ceramics containing dispersants for improved fracture toughness. United States: N. p., 1985.
Web.
Nevitt, M V, Aldred, A T, & Chan, Sai-Kit. New ceramics containing dispersants for improved fracture toughness. United States.
Nevitt, M V, Aldred, A T, and Chan, Sai-Kit. Mon .
"New ceramics containing dispersants for improved fracture toughness". United States.
@article{osti_5459744,
title = {New ceramics containing dispersants for improved fracture toughness},
author = {Nevitt, M V and Aldred, A T and Chan, Sai-Kit},
abstractNote = {The invention is a ceramic composition containing a new class of dispersant for hindering crack propagation by means of one or more energy-dissipative mechanisms. The composition is composed of a ceramic matrix with dispersed particles of a transformation-prone rare-earth niobate, tantalate or mixtures of these with each other and/or with a rare-earth vanadate. The dispersants, having a generic composition tRBO/sub 4/, where R is a rare-earth element, B if Nb or Ta and O is oxygen, are mixed in powder form with a powder of the matrix ceramic and sintered to produce a ceramic form or body. The crack-hindering mechanisms operates to provide improved performance over a wide range of temperature and operating conditions.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jul 01 00:00:00 EDT 1985},
month = {Mon Jul 01 00:00:00 EDT 1985}
}
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