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Title: 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 tRMO.sub.4, where R is a rare-earth element, B is 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.:
United States Of America, Department Of Energy
Sponsoring Org.:
USDOE
OSTI Identifier:
1176570
Patent Number(s):
H000302
Assignee:
United States Of America, Department Of Energy OSTI
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Nevitt, Michael V., Aldred, Anthony T., and Chan, Sai-Kit. Ceramics containing dispersants for improved fracture toughness. United States: N. p., 1987. Web.
Nevitt, Michael V., Aldred, Anthony T., & Chan, Sai-Kit. Ceramics containing dispersants for improved fracture toughness. United States.
Nevitt, Michael V., Aldred, Anthony T., and Chan, Sai-Kit. Tue . "Ceramics containing dispersants for improved fracture toughness". United States. https://www.osti.gov/servlets/purl/1176570.
@article{osti_1176570,
title = {Ceramics containing dispersants for improved fracture toughness},
author = {Nevitt, Michael V. and Aldred, Anthony 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 tRMO.sub.4, where R is a rare-earth element, B is 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 = {1987},
month = {7}
}

Patent:

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