Abstract: A process for producing an improved ceramic fiber molding by submersing the molding into a suspension containing colloidal silica and/or colloidal alumina and chromium oxide powder. The chromium oxide is deposited onto the ceramic fibers thereby increasing the molding's resistance to linear shrinkage and corrosion when subjected to high temperatures.

Abstract: A process for producing an improved ceramic fiber molding by submersing the molding into a suspension containing colloidal silica and/or colloidal alumina and chromium oxide powder. The chromium oxide is deposited onto the ceramic fibers thereby increasing the molding's resistance to linear shrinkage and corrosion when subjected to high temperatures.

Abstract: This composite material includes reinforcing alumina-silica fiber material in a metal matrix. The alumina-silica reinforcing fibers have principal components about 35% to about 65% by weight of SiO.sub.2, about 35% to about 65% by weight of Al.sub.2 O.sub.3, and a content of other substances of less than or equal to about 10% by weight, with the weight percentage of the mullite crystalline form therein being at least about 15%, and with the weight percentage of included non fibrous particles with diameter greater than or equal to 150 microns being not more than about 5%. And the matrix metal is selected from the group consisting of aluminum, magnesium, copper, zinc, lead, tin, and alloys having these as principal components. The volume proportion of the alumina-silica fibers should be at least 0.5%. Within these constraints, the qualities of the composite material with regard to wear, and wear on a mating member, and hardness, bending strength, and tensile strength, are good.

Abstract: A mixture containing 35 to 65% by weight of Al.sub.2 O.sub.3, 30 to 60% by weight of SiO.sub.2, 1.5 to 4% by weight of Cr.sub.2 O.sub.3, and 0.01 to 0.1% by weight of carbon, the balance being unavoidable impurities, is melted, and amorphous fibers are formed from said molten material by blowing or spinning. The fibers are heated rapidly to a temperature of 950.degree. C. to 1,150.degree. C., held at that temperature for several to about a dozen minutes, and cooled rapidly to ordinary room temperature.

Abstract: Thermal insulation material is installed on the inner surface of a duct by placing and compressing said material on a cylinder, inserting the resulting unit into a duct, and releasing the pressure on said material.

Abstract: An expandable ceramic fiber felt to be used as a insulating material comprising ceramic refractory fibrous material, about 2 to 20 weight percent of expandable graphite flakes, and an organic binder. The graphite flakes expand upon heating thereby causing the ceramic fiber felt to expand to fill the gap of an expansion joint or seal of a furnace wall.

Abstract: Each ceramic fiber block is temporarily supported by a supporting member and bar combination previously secured to the furnace casing, before it is finally secured to the casing by another supporting member and bar combination. No separate means for holding the block temporarily is required. As ceramic fiber blocks and supporting members are alternately attached to the casing, it is possible to ensure intimate contact between every two adjoining blocks. The absence of any extra work for holding the blocks temporarily improves the efficiency of the block installation work.

Abstract: Mullite ceramic fiber produced by mixing an aluminosilicate fiber having less than 72 weight percent of Al.sub.2 O.sub.3 with high-alumina substances, such as polycrystalline high-alumina fibers having more than 72 weight percent of Al.sub.2 O.sub.3, and heating of the mixture to about 1,300.degree. to 1,450.degree. C., results in a refractory material characterized by lower bulk density, a low degree of contraction, substantial maintenance of original fiber shape, and total or nearly total consumption of free silica, with corresponding reduction in silicic acid.

Abstract: Fibrous insulating material consisting of a rectangular or semi-cylindrical block obtained by stacking ceramic fiber blankets or felt in the thickness direction thereof and bonding contact surfaces of adjacent blankets or felt to each other with an adhesive. Such insulating fire material is bonded to the furnace surface such that the bonded surfaces are perpendicular to the wall surface. By using the fibrous insulating material which is ready to handle, it is possible to facilitate and reduce time required for construction of the insulating wall.

Abstract: A ceramic fiber felt is obtained by mixing alumina crystalline ceramic fibers having at least about 60 weight percent of Al.sub.2 O.sub.3, the rest being SiO.sub.2 and impurities, and having a filament length ranging from 10 to 30 mm with aluminosilicate non-crystalline ceramic fiber having from about 40 to 70 weight percent of Al.sub.2 O.sub.3, the rest being primarily SiO.sub.2, impurities, and, optionally, including a small amount of metal oxides, and having a filament length ranging from 5 to 30 mm, the weight proportions of the alumina crystalline ceramic fibers to the aluminosilicate non-crystalline ceramic fiber being from about 4:6 to 7.5:2.5, and preferably from about 4:6 to 5:5, and binding the mixture of components with an organic binder.The ceramic fiber felt having a linear percentage shrinkage at 1400.degree. C. of only about 2% is very inexpensive compared to alumina ceramic fiber and is highly suited for use as or in furnace linings.