A high-flux silicon carbide ceramic filter membrane and a preparation method thereof are provided. In the preparation method, a separation layer is directly coated at a time on the basis of a support, that is, after the support is sintered, the separation layer is directly coated and then sintered for carbon removal. In the present disclosure, a sintering process and a coating formula are optimized to prevent fine silicon carbide particles from entering micropores of a support due to capillary filtration and film formation during coating, such that a separation layer with an average pore size of 0.2 m or less can be directly coated on a silicon carbide support with an average pore size of 10 m or more, and fine silicon carbide particles can be effectively prevented from entering micropores of the support during the coating.

The present invention relates to a porous alpha-SiC-containing shaped body with a gas-permeable, open-pored pore structure comprising platelet-shaped crystallites which are connected to form an interconnected, continuous skeletal structure, wherein the skeletal structure consists of more than 80 wt.-% alpha-SiC, relative to the total weight of SiC, a process for producing same and its use as a filter component.

Provided is a method for manufacturing a micropore filter usable as SCE. Stainless steel particles having particle diameters of 3 to 60 m are subjected to milling in a bead mill using zirconia beads to prepare powder having a flakiness of 0.03 to 0.4. The zirconia adhered to the surface of the powder is removed by pickling. A load of 10 to 15 kN is applied to 0.5 to 1.0 g of the pickled powder, thereby compacting the powder into a columnar compact body. The compact body is kept and fired in a vacuum atmosphere of 10.sup.5 to 10.sup.3 Pa at a temperature of 1000 to 1300 C. for 1 to 3 hours to form a sintered body. The sintered body is pressed into a pipe having an inner diameter of 0.90 to 0.99 times of the outer diameter of the sintered body, and extruded to obtain a micropore filter.

A silicon carbide honeycomb filter constituted by honeycomb segments each comprising cell walls forming cells defining pluralities of flow paths longitudinally extending between both end surfaces, plugs sealing end surfaces of the cells alternately in a checkerboard pattern, and an outer peripheral wall, bonding material layers filling lattice gaps between the honeycomb segments for bonding them, and a skin layer covering the bonded honeycomb segments, the thickness of the outer peripheral wall being more than 1.5 times and 9 times or less that of the cell walls.

A refractory filter suitable for filtering molten metal, such as steel, and a method and powdered composition for producing the filter. The filter comprises refractory material, the refractory material comprising: 60-90 wt % alumina; 8-30 wt % zirconia; and 3-20 wt % magnesia. The powdered composition comprises: 60-90 wt % alumina; 8-30 wt % zirconia; and 3-20 wt % magnesia, wherein the powdered composition comprises less than 12.5 wt % reactive alumina, calcined alumina or a mixture thereof, and wherein the remainder of the alumina is tabular alumina. The method comprises: providing a powdered composition in accordance with the invention; forming a filter precursor from the powdered composition and a liquid component; and firing the filter precursor to form a refractory filter.

A pillar-shaped honeycomb structure, wherein a cell density based on a total number of a plurality of inlet cells and a plurality of outlet cells is 29 to 43 cells/cm.sup.2, wherein an average thickness of partition walls is 0.173 mm or more and 0.236 mm or less, and wherein assuming an average value of opening diameters of the plurality of outlet cells except for those adjacent to an outer peripheral side wall is D.sub.out, and an average value of opening diameters of the plurality of inlet cells except for those adjacent to the outer peripheral side wall is D.sub.in, 1.20D.sub.in/D.sub.out1.38 is satisfied.

A cement mixture for applying to a ceramic honeycomb body that includes: (i) inorganic ceramic particles; (ii) an inorganic binder; (iii) an organic binder containing a hydrophilic polymer and a hydrophilic additive comprising a polymer with a different composition than the composition of the hydrophilic polymer, the additive having a weight average molecular weight (M.sub.w) of at least 1,000,000 g/mol; and (iv) an aqueous liquid vehicle.

A method and use of Zeolite and Polyethylenimine (PEI) Polymer coated air filtration media designed to absorb CH.sub.4 and CO.sub.2 and a method and use of Polyacrylonitrile (PAN), Iodine, Vinegar, Resveratrol, Interferon and Zeolite coated disposable respirator media designed to absorb airborne deleterious pollutants such as PM.sub.2.5 and biological agents such as Influenza, COVID-SARS and Avian Pox viruses and bacteria and protect the wearer from inhalation of said pollutant and deleterious agents.

A ceramic honeycomb structure comprising pluralities of honeycomb segments each having pluralities of longitudinally penetrating flow paths partitioned by porous cell walls and plugs formed in the end portions of the flow paths, and a bonding material layer boding the peripheral walls of the honeycomb segments, the bonding material layer comprising silicon carbide particles as aggregate and a bonding phase bonding the silicon carbide particles, the bonding phase comprising at least a cordierite phase and a spinel phase, the molar ratio M1 of the cordierite phase [=cordierite phase/(cordierite phase+spinel phase)] being 0.50 or more and less than 1.0, and the content of (cordierite phase+spinel phase) in the bonding phase being 50% or more by mass.

A honeycomb structure includes a plurality of cell channels passing through an inside of the honeycomb structure and partitioned by porous partition walls, wherein the honeycomb structure includes 80.0 to 94.0% by mass of cordierite as a main crystalline phase and ceria contained in a secondary crystalline phase; the porous partition walls have a porosity of 60% or more as measured by a mercury porosimetry; and for the porous partition walls, a cumulative 10% pore diameter (D10), a cumulative 50% pore diameter (D50) and a cumulative 90% pore diameter (D90) from a small pore side satisfy a relationship (D90D10)/D501.2, in a volume-based cumulative pore diameter distribution as measured by the mercury porosimetry.