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

Holcombe, Cressie E; Bird, Eugene L

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

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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:

Holcombe, Cressie E ^[1]; Bird, Eugene L ^[1]

Knoxville, TN

Issue Date:: 1995-01-01

Research Org.:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

OSTI Identifier:: 870040

Patent Number(s):: 5443892

Assignee:: Martin Marietta Energy Systems, Inc. (Oak Ridge, TN)

Patent Classifications (CPCs):: C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10T - TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

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C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA
C04B2111/0087 - {for metallurgical applications}
C04B35/522 - {Graphite
C04B41/009 - {characterised by the material treated}
C04B41/456 - {the conversion only taking place under certain conditions, e.g. avoiding damage of underlaying layers or parts of the substrate}
C04B41/5027 - {Oxide ceramics in general
C04B41/5042 - {Zirconium oxides or zirconates
C04B41/5045 - {Rare-earth oxides}
C04B41/5057 - {Carbides}
C04B41/5133 - {with a composition mainly composed of one or more of the refractory metals}
C04B41/52 - Multiple coating or impregnating {multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation}
C04B41/522 - {Multiple coatings, for one of the coatings of which at least one alternative is described}
C04B41/81 - Coating or impregnation
C04B41/89 - for obtaining at least two superposed coatings having different compositions

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10T - TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
Y10T428/24942 - including components having same physical characteristic in differing degree
Y10T428/24975 - No layer or component greater than 5 mils thick
Y10T428/30 - Self-sustaining carbon mass or layer with impregnant or other layer

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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.

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                    Holcombe, Cressie E, & Bird, Eugene L. Coated graphite articles useful in metallurgical processes and method for making same.  United States.

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                    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.

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@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}

}

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