Composite for filtering hot gas and method of its manufacture
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United States of America Patent
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-
Dec 10, 1991
Issued Date -
N/A
app pub date -
Feb 27, 1987
filing date -
Nov 25, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A composite filter element for filtering hot gasses is made up of a porous ceramic core to which a porous ceramic, thin outer layer is integrally bonded. The outer layer has a mean pore size which is at least several times smaller than the mean pore size of the substrate and the substrate is at least several times thicker than is the outer layer. The outer layer and the substrate are preferably formed of the same material or of two different materials having essentially the same coefficient of thermal expansion.
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