초록 ▼

Unusually strong and highly perforated plates are formed by pressurized filtration of a suspension of chopped ceramic fibers in an aqueous dispersion of colloidal alumina or colloidal silica through a mold having a perforated filter base and a pin support base having pins that extend through and bey

Unusually strong and highly perforated plates are formed by pressurized filtration of a suspension of chopped ceramic fibers in an aqueous dispersion of colloidal alumina or colloidal silica through a mold having a perforated filter base and a pin support base having pins that extend through and beyond the perforations of the filter base. Pressurized filtration is preferably conducted by applying vacuum on the down stream side of the mold. When the layer of chopped fibers deposited on the perforated filter base has the desired thickness, filtration is stopped. The perforated filter base and pin support base are moved apart to retract the pins from contact with the perforated layer of chopped fibers which is transferred to a drier operating at a temperature not exceeding 650°F., for conversion into a strong perforated plate.

대표청구항 ▼

An unsintered, perforated ceramic fiber plate comprising an unsupported compact layer of chopped ceramic fibers having a thickness not exceeding about 0.5 inch and containing uniformly spaced perforations that have a diameter not exceeding 0.08 inch and that are spaced from one another not exceeding

An unsintered, perforated ceramic fiber plate comprising an unsupported compact layer of chopped ceramic fibers having a thickness not exceeding about 0.5 inch and containing uniformly spaced perforations that have a diameter not exceeding 0.08 inch and that are spaced from one another not exceeding 0.13 inch from center to center, and a binding agent uniformly distributed throughout said compact layer of chopped ceramic fibers and resulting from an inorganic sol selected from the group consisting of colloidal alumina and colloidal silica dried at a temperature not exceeding about 650°F.