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Title: Coated graphite articles useful in metallurgical processes and method for making same

Abstract

Graphite articles including crucibles and molds used in metallurgical processes involving the melting and the handling of molten metals and alloys that are reactive with carbon when in a molten state and at process temperatures up to about 2000.degree. C. are provided with a multiple-layer coating for inhibiting carbon diffusion from the graphite into the molten metal or alloys. The coating is provided by a first coating increment of a carbide-forming metal on selected surfaces of the graphite, a second coating increment of a carbide forming metal and a refractory metal oxide, and a third coating increment of a refractory metal oxide. The second coating increment provides thermal shock absorbing characteristics to prevent delamination of the coating during temperature cycling. A wash coat of unstabilized zirconia or titanium nitride can be applied onto the third coating increment to facilitate release of melts from the coating.

Inventors:
 [1];  [1]
  1. (Knoxville, TN)
Issue Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
OSTI Identifier:
870040
Patent Number(s):
5443892
Assignee:
Martin Marietta Energy Systems, Inc. (Oak Ridge, TN) ORNL
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
coated; graphite; articles; useful; metallurgical; processes; method; including; crucibles; molds; involving; melting; handling; molten; metals; alloys; reactive; carbon; process; temperatures; 2000; degree; provided; multiple-layer; coating; inhibiting; diffusion; metal; increment; carbide-forming; selected; surfaces; carbide; forming; refractory; oxide; third; provides; thermal; shock; absorbing; characteristics; prevent; delamination; temperature; cycling; wash; coat; unstabilized; zirconia; titanium; nitride; applied; facilitate; release; melts; molten metals; selected surface; forming metal; thermal shock; titanium nitride; refractory metal; molten metal; metal oxide; stabilized zirconia; metallurgical process; articles including; carbide forming; processes involving; graphite articles; prevent delamination; metallurgical processes; temperature cycling; coated graphite; articles useful; /428/

Citation Formats

Holcombe, Cressie E., and Bird, Eugene L. Coated graphite articles useful in metallurgical processes and method for making same. United States: N. p., 1995. Web.
Holcombe, Cressie E., & Bird, Eugene L. Coated graphite articles useful in metallurgical processes and method for making same. United States.
Holcombe, Cressie E., and Bird, Eugene L. Sun . "Coated graphite articles useful in metallurgical processes and method for making same". United States. https://www.osti.gov/servlets/purl/870040.
@article{osti_870040,
title = {Coated graphite articles useful in metallurgical processes and method for making same},
author = {Holcombe, Cressie E. and Bird, Eugene L.},
abstractNote = {Graphite articles including crucibles and molds used in metallurgical processes involving the melting and the handling of molten metals and alloys that are reactive with carbon when in a molten state and at process temperatures up to about 2000.degree. C. are provided with a multiple-layer coating for inhibiting carbon diffusion from the graphite into the molten metal or alloys. The coating is provided by a first coating increment of a carbide-forming metal on selected surfaces of the graphite, a second coating increment of a carbide forming metal and a refractory metal oxide, and a third coating increment of a refractory metal oxide. The second coating increment provides thermal shock absorbing characteristics to prevent delamination of the coating during temperature cycling. A wash coat of unstabilized zirconia or titanium nitride can be applied onto the third coating increment to facilitate release of melts from the coating.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1995},
month = {1}
}

Patent:

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