Coated refractory article and method

Details Coated refractory article and method Coated refractory article and method

1990-08-01

1992-10-06

Robinson, Ellis P.

Stock material or miscellaneous articles

Self-sustaining carbon mass or layer with impregnant or...

428367, 428469, 428426, 428428, 428432, 428697, 428698, 428701, 428702, 428427, B32B 900

Patent

active

051530708

ABSTRACT:
For protection against oxidation or other adverse chemical deterioration, substrates such as carbon, intermetallic aluminides, and refractory metal alloys are provided with barrier coatings of an aluminoborate glass-ceramic coating having a composition, in weight percent, of about 10-55% Al.sub.2 O.sub.3, 4-40% B.sub.2 O.sub.3, up to 70% total of RO, wherein RO consists of one or more alkaline earth metal oxides selected in amounts not exceeding the indicated proportions from the group consisting of up to 70% BaO, up to 60% SrO, up to 40% CaO, and up to 25% MgO, up to 35% total of R.sub.2 O, wherein R.sub.2 O consists of one or more alkali metal oxides selected in amounts not exceeding the indicated proportion from the group consisting of up to 35% Na.sub.2 O, up to 30% K.sub.2 O, and up to 15% Li.sub.2 O, up to 25% total of metal oxides selected from the group consisting of ZnO and MnO, up to 30% of SiO.sub.2, and up to 10% F.

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