New ceramics containing dispersants for improved fracture toughness
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.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- DOE Contract Number:
- W-31-109-ENG-38
- Assignee:
- Dept. of Energy
- Application Number:
- ON: DE86013699
- OSTI ID:
- 5459744
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Ceramics containing dispersants for improved fracture toughness
Aqueous Synthesis and Structural Comparison of Rare Earth Niobates and Tantalates: (La,K,[vacancy])[subscript 2]Nb[subscript 2]O[subscript 7-x](OH)[subscript 2] and Ln2Ta2O7(OH)2 ([vacancy] = vacancy; Ln = La-Sm)
Related Subjects
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