Metal founding – Means to shape metallic material – Continuous or semicontinuous casting
Patent
1978-04-27
1979-11-27
Newsome, John H.
Metal founding
Means to shape metallic material
Continuous or semicontinuous casting
164138, 427 34, 427133, 427423, 428552, 428640, 428654, 428469, 428457, B05D 306, B05D 724, B32B 1504, B32B 904
Patent
active
041756118
ABSTRACT:
The invention relates to a method of producing a graphite die for use in continuous casting of non-ferrous metals. The die has wearing surfaces which, in accordance with the invention, are coated, using either plasma-combustion flame or liquid-spraying techniques, with a first layer consisting of a metal or a metal plus a ceramic material and then with a second layer of ceramic material. The coating materials are applied as a suspension in a liquid medium by painting or spraying techniques or they must be applied by plasma or combustion flame spraying techniques.
The first layer may comprise one or more of the following substances: silicon, iron, nickel, chromium, molybdenum, tungsten or their alloys or any other metal which can be subsequently carburized by heating with graphite in an inert or reducing atmosphere.
Alternatively the first layer may be either aluminium, an aluminium alloy, an aluminium-metal composite or a mixture of the metal(s) and alumina and the second layer is preferably alumina.
The second layer is selected from titania, chromia, zirconia, silica, magnesia or mixed oxides such as zirconium silicate, magnesium zirconate, mullite, silliminite, refractory carbides such as boron carbide, silicon carbide, chromium carbide; refractory borides such as zirconium or titanium diboride; or refractory nitrides such as silicon nitride.
When the final coating has been applied, the coatings are sintered or baked in an inert atmosphere.
REFERENCES:
patent: 2775531 (1956-12-01), Montgomery et al.
patent: 2992127 (1961-07-01), Jones
patent: 3091548 (1963-05-01), Dillon
patent: 3266107 (1966-08-01), Groike
patent: 3366464 (1968-01-01), Guichet et al.
patent: 3515201 (1970-06-01), Zimmerman
British Steel Corporation (Chemicals) Limited
Newsome John H.
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