Plastic and nonmetallic article shaping or treating: processes – With printing or coating of workpiece
Patent
1995-03-16
1996-10-29
Simmons, David A.
Plastic and nonmetallic article shaping or treating: processes
With printing or coating of workpiece
264 60, 264131, 427352, 427379, 427380, 1062868, 10628717, 10628734, B29C 5900, B05D 302
Patent
active
055694276
ABSTRACT:
A process for producing a low porosity, high temperature coating on a porous substrate based on ceramic fibers of refractory compounds. The coating comprises from 30.8 to 41.9 weight % of silica (SiO.sub.2) from a silica sol, from 30.2 to 49.4 weight % of alumina (Al.sub.2 O.sub.3), from 4.0 to 16.3 weight % of silicon carbide (SiC), and from 11.6 to 16.6 weight % of molybdenum disilicide (MoSi.sub.2). The coating has an emissivity of not less than 0.8 and an operating temperature of up to 1500.degree. C. The process is carried out without a firing step and includes the steps of preparing a slurry comprising from 65 to 75 weight % of a silica sol having a content of 20 to 50 weight % of SiO.sub.2 and from 25 to 35 weight % of a mixture of particles of the refractory compounds Al.sub.2 O.sub.3, SiC, and MoSi.sub.2 ; applying the slurry to the ceramic fiber based porous substrate to form a layer of the slurry on the substrate; and drying the layer in several steps, first at ambient temperature, then at a temperature of 90.degree. to 100.degree. C., and then at a temperature of 200.degree. to 220.degree. C. until a constant weight of the coated substrate is obtained. The mixture contains from 52 to 71 weight % of Al.sub.2 O.sub.3, from 6 to 28 weight % of SiC, and from 20 to 25 weight % of MoSi.sub.2.
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Bersenev Alexei Y.
Semenova Elena V.
Solntsev Stanislav S.
Tjurin Vladimir M.
Aerospatiale - Societe Nationale Industrielle
Mayes M. Curtis
Simmons David A.
VIAM - All Russian Institut of Aviation Materials
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