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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:
 [1];  [1];  [2]
  1. Wheaton, IL
  2. Darien, IL
Issue Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
OSTI Identifier:
875199
Patent Number(s):
H302
Assignee:
United States of America as represented by United States (Washington, DC)
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
ceramics; containing; dispersants; improved; fracture; toughness; ceramic; composition; dispersant; hindering; crack; propagation; means; energy-dissipative; mechanisms; composed; matrix; dispersed; particles; transformation-prone; rare-earth; niobate; tantalate; mixtures; vanadate; generic; trmo; element; nb; oxygen; mixed; powder; form; sintered; produce; crack-hindering; operates; provide; performance; wide; range; temperature; operating; conditions; crack propagation; provide improved; improved performance; ceramic matrix; ceramic composition; operating conditions; fracture toughness; wide range; composition containing; powder form; operating condition; earth element; improved fracture; dispersed particles; ceramic form; provide improve; /501/

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. Thu . "Ceramics containing dispersants for improved fracture toughness". United States. https://www.osti.gov/servlets/purl/875199.
@article{osti_875199,
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 = {1}
}

Patent:

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