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Title: High-temperature zirconia insulation and method for making same

Abstract

The present invention is directed to a highly pure, partially stabilized, fibrous zirconia composite for use as thermal insulation in environments where temperatures up to about 2000.degree. C. are utilized. The composite of the present invention is fabricated into any suitable configuration such as a cone, cylinder, dome or the like by vacuum molding an aqueous slurry of partially stabilized zirconia fibers into a desired configuration on a suitably shaped mandrel. The molded fibers are infiltrated with zirconyl nitrate and the resulting structure is then dried to form a rigid structure which may be removed and placed in a furnace. The structure is then heated in air to a temperature of about 600.degree. C. for driving off the nitrate from the structure and for oxidizing the zirconyl ion to zirconia. Thereafter, the structure is heated to about 950.degree. to 1,250.degree. C. to fuse the zirconia fibers at their nexi in a matrix of zirconia. The composite produced by the present invention is self-supporting and can be readily machined to desired final dimensions. Additional heating to about 1800.degree. to 2000.degree. C. further improves structural rigidity.

Inventors:
 [1];  [2];  [3]
  1. (Clinton, TN)
  2. (Knoxville, TN)
  3. (Oak Ridge, TN)
Issue Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
OSTI Identifier:
866581
Patent Number(s):
4743340
Assignee:
Martin Marietta Energy Systems Inc. (Oak Ridge, TN) ORNL
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
high-temperature; zirconia; insulation; method; directed; highly; pure; partially; stabilized; fibrous; composite; thermal; environments; temperatures; 2000; degree; utilized; fabricated; suitable; configuration; cone; cylinder; dome; vacuum; molding; aqueous; slurry; fibers; desired; suitably; shaped; mandrel; molded; infiltrated; zirconyl; nitrate; resulting; structure; dried; form; rigid; removed; placed; furnace; heated; air; temperature; 600; driving; oxidizing; thereafter; 950; 250; fuse; nexi; matrix; produced; self-supporting; readily; machined; final; dimensions; additional; heating; 1800; improves; structural; rigidity; zirconia fibers; vacuum molding; additional heat; thermal insulation; stabilized zirconia; aqueous slurry; partially stabilized; desired configuration; highly pure; suitable configuration; rigid structure; final dimensions; desired final; suitably shaped; resulting structure; zirconia fiber; zirconia composite; /162/

Citation Formats

Wrenn, Jr., George E., Holcombe, Jr., Cressie E., and Lewis, Jr., John. High-temperature zirconia insulation and method for making same. United States: N. p., 1988. Web.
Wrenn, Jr., George E., Holcombe, Jr., Cressie E., & Lewis, Jr., John. High-temperature zirconia insulation and method for making same. United States.
Wrenn, Jr., George E., Holcombe, Jr., Cressie E., and Lewis, Jr., John. Fri . "High-temperature zirconia insulation and method for making same". United States. https://www.osti.gov/servlets/purl/866581.
@article{osti_866581,
title = {High-temperature zirconia insulation and method for making same},
author = {Wrenn, Jr., George E. and Holcombe, Jr., Cressie E. and Lewis, Jr., John},
abstractNote = {The present invention is directed to a highly pure, partially stabilized, fibrous zirconia composite for use as thermal insulation in environments where temperatures up to about 2000.degree. C. are utilized. The composite of the present invention is fabricated into any suitable configuration such as a cone, cylinder, dome or the like by vacuum molding an aqueous slurry of partially stabilized zirconia fibers into a desired configuration on a suitably shaped mandrel. The molded fibers are infiltrated with zirconyl nitrate and the resulting structure is then dried to form a rigid structure which may be removed and placed in a furnace. The structure is then heated in air to a temperature of about 600.degree. C. for driving off the nitrate from the structure and for oxidizing the zirconyl ion to zirconia. Thereafter, the structure is heated to about 950.degree. to 1,250.degree. C. to fuse the zirconia fibers at their nexi in a matrix of zirconia. The composite produced by the present invention is self-supporting and can be readily machined to desired final dimensions. Additional heating to about 1800.degree. to 2000.degree. C. further improves structural rigidity.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {1}
}

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