Coated graphite articles useful in metallurgical processes and m

Details Coated graphite articles useful in metallurgical processes and m Coated graphite articles useful in metallurgical processes and m

1993-03-19

1995-08-22

Turner, Archene

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428212, 428469, 428472, 428408, 428697, 428699, 428701, 428702, C04B 4106

Patent

active

054438926

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.

REFERENCES:
patent: 3771976 (1973-11-01), Wakefield
patent: 3900592 (1975-08-01), Kennedy et al.

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