Abstract: A particulate composition contains ?-alumina particles, and water-absorbing polymer particles. The content of the water-absorbing polymer particles is 2 parts by mass or more and 60 parts by mass or less with respect to 100 parts by mass of the ?-alumina particles, and the content of the ?-alumina particles in the particulate composition is 50% by mass or more.

Abstract: A method for producing an alumina sintered body, comprising: molding an alumina powder to obtain an alumina article, the alumina powder comprising alumina particles having a particle diameter of not less than 0.1 ?m and less than 1 ?m, and alumina particles having a particle diameter of not less than 1 ?m and less than 100 ?m; forming a carbon powder-containing layer on a surface of the alumina article to obtain a laminate body; and irradiating a surface of the carbon powder-containing layer of the laminate body with a laser light to form a transparent alumina sintered portion.

Abstract: A porous ceramic laminate, which can reduce pressure loss of a fluid, includes a first porous layer and a second porous layer. The second porous layer is laminated on, in contact with or via air, the first porous layer. A part of the second porous layer is laminated on, in contact with, the first porous layer. Each of the first porous layer and the second porous layer contains a metal oxide. A ratio Da/Db of an average pore diameter Da of the first porous layer relative to an average pore diameter Db of the second porous layer is 10 or more. A proportion of a portion in which a distance between the first porous layer and the second porous layer is smaller than 1 ?m is 70% or less.

Abstract: A particle composition according to the present invention contains: hydraulic alumina particles; and a water-absorbing polymer.

Abstract: Manufacture of ceramic honeycomb fired body. Green molded body is placed on a firing base and fired. The firing base and green molded body are each a column containing a ceramic raw material and having a partition wall forming a plurality of flow paths, and patterns of end surfaces of the two partition walls are the same as each other as seen from an extending direction of the flow paths. The green molded body is placed on the firing base displaced in a horizontal direction by a predetermined distance, or rotated around a vertical axis V of the green molded body by a predetermined angle ?, so that only a part of the lower side end surface of the partition wall of the green molded body is in contact with the upper side end surface of the partition wall of the firing base.

Abstract: A closing jig for a green honeycomb molded body includes closing protrusions which are arranged at positions corresponding to regular hexagonal cells and are inserted into the regular hexagonal cells to weld partition walls to each other for closing. Each of the closing protrusions includes a conical tip end portion that has a conical shape, and a triangular pyramidal base portion with a truncated triangular pyramidal shape having an apex angle larger than an apex angle of the conical tip end portion. The conical tip end portion has the conical shape with an acute apex angle. The triangular pyramidal base portion has the truncated triangular pyramidal shape having the large apex angle.

Abstract: Regular hexagonal cells at both an top surface and a bottom surface of a green honeycomb molded body are closed at the same time. Therefore, the regular hexagonal cells can be closed effectively. In addition, the regular hexagonal cells of the green honeycomb molded body are closed by welding partition walls with each other, by inserting each of closing protrusions of a closing jig into the plurality of regular hexagonal cells. Therefore, a closing paste like the conventional method is not required. In a case where a honeycomb structure is used for a diesel particulate filter, turbulence of exhaust gas flow, at the end surface of the side to supply the exhaust gas and/or the side to discharge the exhaust gas, is reduced, and pressure drop can be reduced.

Abstract: A fixing jig includes a pedestal including a placing surface on which a columnar honeycomb structure is placed, holding members fixed to the pedestal and configured to hold a side surface of the honeycomb structure placed on the placing surface, and drawing and fixing members fixed to the pedestal and configured to draw and fix the surface on the pedestal side in the outer circumferential portion of a mask placed on the honeycomb structure. Consequently, the fixing jig can fix the honeycomb structure and the mask aligned with each other and is less likely to hinder the alignment of the mask.

Abstract: A closing jig for a green honeycomb molded body includes closing protrusions which are arranged at positions corresponding to regular hexagonal cells and are inserted into the regular hexagonal cells to weld partition walls to each other for closing. Each of the closing protrusions includes a conical tip end portion that has a conical shape, and a triangular pyramidal base portion with a truncated triangular pyramidal shape having an apex angle larger than an apex angle of the conical tip end portion. The conical tip end portion has the conical shape with an acute apex angle. The triangular pyramidal base portion has the truncated triangular pyramidal shape having the large apex angle.

Abstract: Regular hexagonal cells at both an top surface and a bottom surface of a green honeycomb molded body are closed at the same time. Therefore, the regular hexagonal cells can be closed effectively. In addition, the regular hexagonal cells of the green honeycomb molded body are closed by welding partition walls with each other, by inserting each of closing protrusions of a closing jig into the plurality of regular hexagonal cells. Therefore, a closing paste like the conventional method is not required. In a case where a honeycomb structure is used for a diesel particulate filter, turbulence of exhaust gas flow, at the end surface of the side to supply the exhaust gas and/or the side to discharge the exhaust gas, is reduced, and pressure drop can be reduced.

Abstract: Manufacture of ceramic honeycomb fired body. Green molded body is placed on a firing base and fired. The firing base and green molded body are each a column containing a ceramic raw material and having a partition wall forming a plurality of flow paths, and patterns of end surfaces of the two partition walls are the same as each other as seen from an extending direction of the flow paths. The green molded body is placed on the firing base displaced in a horizontal direction by a predetermined distance, or rotated around a vertical axis V of the green molded body by a predetermined angle ?, so that only a part of the lower side end surface of the partition wall of the green molded body is in contact with the upper side end surface of the partition wall of the firing base.

Abstract: A plugging device 100 including a main body portion 10 having a depressed portion 10d and a communication path 10e opening into an inner surface 10c of the depressed portion 10d; an elastic plate 20 fixed to the main body portion 10 so as to cover the depressed portion 10d; and a pump 50 connected to the communication path 10e.

Abstract: A method for manufacturing a honeycomb-structured object having a plurality of through holes having ends thereof plugged, including a step of pressing a plugging material against one end surface of a honeycomb-structured object 70 having a plurality of through holes 70a by a plate 20 to fill one ends of the through holes 70a with the plugging material; and a step of protruding a part of a portion in the plate 20 opposed to the one end surface of the honeycomb-structured object 70 toward the one end surface to pull the other part of the portion in the plate 20 opposed to the one end surface of the honeycomb-structured object 70 and the one end surface away from each other.

Abstract: The present invention provides a green molded body capable of easily controlling the porosity of a honeycomb structure. One aspect of the present invention is a green molded body composed of a honeycomb-shaped cylindrical body 70 with a plurality of through holes 70a being formed approximately in parallel with each other, wherein the cylindrical body 70 comprises a ceramic raw material powder and a fluorine source, and wherein the ceramic raw material powder is the one for forming at least one of an aluminum titanate-based ceramics and a cordierite-based ceramics by sintering.

Abstract: To provide a plugging material that is hardened at low temperature (e.g., 100 to 300° C.), can obtain excellent adhesion to partition walls of a ceramic honeycomb sintered body, and can obtain excellent heat resistance. A plugging material comprising a water-based inorganic adhesive and aluminum titanate-based ceramic particles.

Abstract: A fixing jig includes a pedestal including a placing surface on which a columnar honeycomb structure is placed, holding members fixed to the pedestal and configured to hold a side surface of the honeycomb structure placed on the placing surface, and drawing and fixing members fixed to the pedestal and configured to draw and fix the surface on the pedestal side in the outer circumferential portion of a mask placed on the honeycomb structure. Consequently, the fixing jig can fix the honeycomb structure and the mask aligned with each other and is less likely to hinder the alignment of the mask.

Abstract: The mask of the invention is used for plugging of the cells of a honeycomb structure, and it has a plurality of first through-holes running through a thickness direction of the mask, in a region that is to contact with an end face of the honeycomb structure when used. The first through-holes have an open area of 0.03 mm2 or greater, and less than 90% of an open area of the cells to be plugged through the first through-holes.

Abstract: Manufacture of ceramic honeycomb fired body. Green molded body is placed on a firing base and fired. The firing base and green molded body are each a column containing a ceramic raw material and having a partition wall forming a plurality of flow paths, and patterns of end surfaces of the two partition walls are the same as each other as seen from an extending direction of the flow paths. The green molded body is placed on the firing base displaced in a horizontal direction by a predetermined distance, or rotated around a vertical axis V of the green molded body by a predetermined angle ?, so that only a part of the lower side end surface of the partition wall of the green molded body is in contact with the upper side end surface of the partition wall of the firing base.

Abstract: A green molded body comprises an organic binder and an inorganic compound source powder containing an aluminum source powder and a titanium source powder, wherein the organic binder is such that the viscosity at 20° C. of a 2 wt % aqueous solution of the organic binder is 5000 mPa·s or higher. A method for producing an aluminum titanate fired body includes the steps of molding a raw material mixture comprising an organic binder and an inorganic compound source powder containing an aluminum source powder and a titanium source powder to obtain a green molded body; heating the green molded body obtained at 150° C. to 900° C. to remove the organic binder; and firing the green molded body from which the organic binder has been removed, at 1300° C. or higher, wherein the organic binder is such that the viscosity at 20° C. of a 2 wt % aqueous solution of the organic binder is 5000 mPa·s or higher.

Abstract: A method for manufacturing a honeycomb-structured object having a plurality of through holes having ends thereof plugged, including a step of pressing a plugging material against one end surface of a honeycomb-structured object 70 having a plurality of through holes 70a by a plate 20 to fill one ends of the through holes 70a with the plugging material; and a step of protruding a part of a portion in the plate 20 opposed to the one end surface of the honeycomb-structured object 70 toward the one end surface to pull the other part of the portion in the plate 20 opposed to the one end surface of the honeycomb-structured object 70 and the one end surface away from each other.