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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 2,000/sup 0/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/sup 0/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/sup 0/ to 1,250/sup 0/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/sup 0/ to 2000/sup 0/C further improves structural rigidity.

Inventors:
; ;
OSTI Identifier:
5319934
Application Number:
ON: DE84006216
Assignee:
EDB-84-036694
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; THERMAL INSULATION; FABRICATION; ZIRCONIUM OXIDES; COMPOSITE MATERIALS; FIBERS; VERY HIGH TEMPERATURE; CHALCOGENIDES; MATERIALS; OXIDES; OXYGEN COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; ZIRCONIUM COMPOUNDS; 360201* - Ceramics, Cermets, & Refractories- Preparation & Fabrication

Citation Formats

Wrenn, G.E. Jr., Holcombe, C.E. Jr., and Lewis, J. Jr. High-temperature zirconia insulation and method for making same. United States: N. p., Web.
Wrenn, G.E. Jr., Holcombe, C.E. Jr., & Lewis, J. Jr. High-temperature zirconia insulation and method for making same. United States.
Wrenn, G.E. Jr., Holcombe, C.E. Jr., and Lewis, J. Jr. . "High-temperature zirconia insulation and method for making same". United States.
@article{osti_5319934,
title = {High-temperature zirconia insulation and method for making same},
author = {Wrenn, G.E. Jr. and Holcombe, C.E. Jr. and Lewis, J. Jr.},
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 2,000/sup 0/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/sup 0/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/sup 0/ to 1,250/sup 0/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/sup 0/ to 2000/sup 0/C further improves structural rigidity.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {},
month = {}
}