New ceramics containing dispersants for improved fracture toughness
Patent
·
OSTI ID:5459744
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 Lab., IL (USA)
- DOE Contract Number:
- W-31109-ENG-38
- Assignee:
- Dept. of Energy
- Patent Number(s):
- None
- Application Number:
- ON: DE86013699
- OSTI ID:
- 5459744
- Country of Publication:
- United States
- Language:
- English
Similar Records
Ceramics containing dispersants for improved fracture toughness
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)
Patent
·
Wed Dec 31 23:00:00 EST 1986
·
OSTI ID:875199
Ceramics containing dispersants for improved fracture toughness
Patent
·
Tue Jul 07 00:00:00 EDT 1987
·
OSTI ID:1176570
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)
Journal Article
·
Tue Jun 30 00:00:00 EDT 2009
· Chem. Mater.
·
OSTI ID:1005586
Related Subjects
36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ADDITIVES
CERAMICS
CRACK PROPAGATION
DISPERSION HARDENING
FRACTURE PROPERTIES
HARDENING
MECHANICAL PROPERTIES
NIOBATES
NIOBIUM COMPOUNDS
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
TANTALATES
TANTALUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VANADATES
VANADIUM COMPOUNDS
VERY HIGH TEMPERATURE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ADDITIVES
CERAMICS
CRACK PROPAGATION
DISPERSION HARDENING
FRACTURE PROPERTIES
HARDENING
MECHANICAL PROPERTIES
NIOBATES
NIOBIUM COMPOUNDS
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
TANTALATES
TANTALUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VANADATES
VANADIUM COMPOUNDS
VERY HIGH TEMPERATURE