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A ceramic fiber composite structure particularly suitable for use as a hot gas cleanup ceramic fiber composite filter and method of making same from ceramic composite material has a structure which provides for increased strength and toughness in high temperature environments. The ceramic fiber comp

A ceramic fiber composite structure particularly suitable for use as a hot gas cleanup ceramic fiber composite filter and method of making same from ceramic composite material has a structure which provides for increased strength and toughness in high temperature environments. The ceramic fiber composite structure or filter is made by a process in which a continuous ceramic fiber is intimately surrounded by discontinuous chopped ceramic fibers during manufacture to produce a ceramic fiber composite preform which is then bonded using various ceramic binders. The ceramic fiber composite preform is then fired to create a bond phase at the fiber contact points. Parameters such as fiber tension, spacing, and the relative proportions of the continuous ceramic fiber and chopped ceramic fibers can be varied as the continuous ceramic fiber and chopped ceramic fiber are simultaneously formed on the porous vacuum mandrel to obtain a desired distribution of the continuous ceramic fiber and the chopped ceramic fiber in the ceramic fiber composite structure or filter.

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[ We claim:] [1.] A method for making a ceramic fiber composite filter having a distribution of continuous ceramic fiber and chopped ceramic fibers throughout a wall thickness of the filter, comprising the steps of:providing a porous vacuum mandrel and applying a vacuum thereto;filament winding a co

[ We claim:] [1.] A method for making a ceramic fiber composite filter having a distribution of continuous ceramic fiber and chopped ceramic fibers throughout a wall thickness of the filter, comprising the steps of:providing a porous vacuum mandrel and applying a vacuum thereto;filament winding a continuous ceramic fiber onto the porous vacuum mandrel while simultaneously providing a dilute chopped ceramic fiber slurry onto the porous vacuum mandrel and continuous ceramic fiber being filament wound thereon so that the continuous ceramic fiber is intimately surrounded by the chopped ceramic fibers, and varying the relative proportions of the continuous fiber and chopped ceramic fibers to produce a ceramic fiber composite filter preform having a distribution of the continuous ceramic fiber and chopped ceramic fibers throughout a wall thickness of the preform;impregnating the ceramic composite filter preform with a ceramic binder, removing any excess ceramic binder, and drying the impregnated ceramic composite filter preform; andfiring the ceramic composite filter preform at a temperature of 870.degree. C. to 1150.degree. C. (1598.degree. F.-2102.degree. F.) to create a bond phase at the fiber contact points and produce the ceramic fiber composite filter.