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Title: 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:
; ;
Publication Date:
Research Org.:
Argonne National Lab., IL (USA)
OSTI Identifier:
5459744
Application Number:
ON: DE86013699
Assignee:
Dept. of Energy ANL; ERA-11-004845; EDB-86-136425
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 = {1985},
month = {7}
}