초록 ▼

A coated ceramic has alumina as an amorphous residue from an alumina sol containing alumina powder or and, optionally, a high emittance powder. The alumina powder alters the rheology and wetting characteristics of the sol to aid in forming the residue and increases the alumina concentration (% solid

A coated ceramic has alumina as an amorphous residue from an alumina sol containing alumina powder or and, optionally, a high emittance powder. The alumina powder alters the rheology and wetting characteristics of the sol to aid in forming the residue and increases the alumina concentration (% solids) in the residue. The high emittance powder radiates heat out of the residue and away from the ceramic when the coated ceramic is heated, such as during orbital reentry.

대표청구항 ▼

[ We claim:] [1.] A coated ceramic suitable for use as a flexible insulating blanket at temperatures at least about 1800-2300.degree. F. comprising:(a) a ceramic substrate;(b) an alumina surface coating on the substrate, wherein the coating is formed by applying a sol to the substrate to produce an

[ We claim:] [1.] A coated ceramic suitable for use as a flexible insulating blanket at temperatures at least about 1800-2300.degree. F. comprising:(a) a ceramic substrate;(b) an alumina surface coating on the substrate, wherein the coating is formed by applying a sol to the substrate to produce an amorphous alumina residue;(c) an effective amount of alumina powder in the coating being added to the sol to thicken and to stabilize the sol and to improve wetting of the sol on the substrate;(d) optionally, an effective amount of cement in the coating added to the sol to improve bonding between the coating and the substrate; and(e) optionally, a high emittance powder carried in the sol to radiate heat from the coating.