Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1986-11-24
1988-09-13
Herbert, Thomas J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428332, 428469, 428701, B32B 1504
Patent
active
047709308
ABSTRACT:
A multilayered thermal insulating composite is formed of a first layer of zirconia-bonded zirconia fibers for utilization near the hot phase or surface of a furnace or the like. A second layer of zirconia-bonded metal oxide fibers is attached to the zirconia fiber layer by a transition layer formed of intermingled zirconia fibers and metal oxide fibers. The thermal insulation is fabricated by vacuum molding with the layers being sequentially applied from aqueous solutions containing the fibers to a configured mandrel. A portion of the solution containing the fibers forming the first layer is intermixed with the solution containing the fibers of the second layer for forming the layer of mixed fibers. The two layers of fibers joined together by the transition layer are saturated with a solution of zirconium oxynitrate which provides a zirconia matrix for the composite when the fibers are sintered together at their nexi.
REFERENCES:
patent: 4526824 (1985-07-01), Dworak et al.
patent: 4629661 (1986-12-01), Hilbert et al.
Holcombe, Jr. Cressie E.
Wrenn, Jr. George E.
Herbert Thomas J.
Holsopple Herman L.
Martin Marietta Energy Systems Inc.
Winchell Bruce M.
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