Compositions: coating or plastic – Coating or plastic compositions – Molds and mold coating compositions
Patent
1974-12-13
1976-06-22
Arnold, Donald J.
Compositions: coating or plastic
Coating or plastic compositions
Molds and mold coating compositions
75 94, 75 96, 106 3822, 106 3828, 106 52, 164 82, C03C 304, B22D 1100
Patent
active
039649164
ABSTRACT:
Particulate casting material is applied onto the upper surface of molten steel in a vertical continuous casting mold where it rapidly melts to form a protective flux-lubricant molten glass covering which also flows down between the solidifying cast steel and the mold wall. Casting material is a substantially chemically homogeneous, pre-reacted, but substantially unfused mixture of multiple crystalline phases and preferably in a thorough blend of the mixture with up to 10% by weight finely divided graphite. The mixture: (a) analytically consists essentially of, by weight thereof, 20-45% SiO.sub.2, 10-40% CaO and/or SrO and/or BaO, 0-10% Al.sub.2 O.sub.3, 0-11% Fe.sub.2 O.sub.3, 5-25% Na.sub.2 O and/or K.sub.2 O, 0-15% MgO and 3-15% F ion; (b) exhibits not more than 2% weight loss upon heating thereof at 900.degree.C. for 1 hour; and (c) uniformly melts at temperatures of molten steel to form a fluid glass having the following viscosity characteristics: 1-80 poises at 1100.degree.C., 0.1-3 poises at 1500.degree.C. and a set point less than 1150.degree.C. The mixture is formed by thoroughly and intimately mixing a batch of ingredients yielding the aforesaid analytical composition and having an aggregate particle sizing, by weight, of at least 75% -120 mesh and at least 60% -200 mesh, and heating the mixed batch at temperature of at least 550.degree.C. to less than 1000.degree.C. for time sufficient to react and chemically combine the Na.sub.2 O and K.sub.2 O with the other ingredients, to render the resultant mixture substantially chemically homogeneous and to reduce volatiles in that mixture to a level not more than 2% weight loss as aforesaid.
REFERENCES:
patent: 3677325 (1972-07-01), Austin
patent: 3708314 (1973-01-01), Kishida et al.
patent: 3899324 (1975-08-01), Corbett
patent: 3926246 (1975-12-01), Corbett et al.
Armistead William H.
Mamazza Dominic P.
Rostoker David
Woolley Frank E.
Arnold Donald J.
Corning Glass Works
Parrish John
Patty, Jr. Clarence R.
Wardell Richard N.
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