A ceramic structure includes a plurality of porous ceramic members each being warped, each of the plurality of porous ceramic members having a bonding portion and end portions at both ends of each of the plurality of porous ceramic members in the longitudinal direction of each of the plurality of porous ceramic members, and an adhesive provided only on the bonding portion between the plurality of porous ceramic members to connect the plurality of porous ceramic members except for the end portions of the plurality of ceramic members.

An integral ceramic filter assembly (39) is produced by adhering with a ceramic seal layer (15) outer surfaces of a plurality of filters(F1). Each of the filters is formed from a sintered porous ceramic body. The ceramic filter assembly has a ceramic smoothing layer (16) applied to the outer surface of the assembly, which as a whole has a generally circular cross-section or generally oval cross-section. Also disclosed is an exhaust gas purification apparatus including the filter assembly.

An integral ceramic filter assembly (39) is produced by adhering with a ceramic seal layer (15) outer surfaces of a plurality of filters (F1). Each of the filters is formed from a sintered porous ceramic body made of α-silicon carbide and having a specific ratio of filter length to filter cross-section. The ceramic filter assembly has a ceramic smoothing layer (16) applied to the outer surface of the assembly, which as a whole has a generally circular cross-section or generally oval cross-section. Also disclosed is an exhaust gas purification apparatus including the filter assembly.

Respective pieces of the porous honeycomb segments (2) are stacked while interposing the adhesive layers between respective adhered surfaces (2a), and are bonded together by performing main pressurization (F1, F2) on the whole through the porous honeycomb segments (2) located on an outermost layer after stacking a predetermined number of pieces. Main pressurization force at this time is simultaneously applied to all the honeycomb segments (2) and does not act as a separating force against any of the honeycomb segments (2).

Ein Keramikmodul (1) zur Befeuchtung eines Luftstroms mit einer Befeuchtungsflüssigkeit weist eine offenporige Struktur aus porösen Keramikwandungen auf. Es umfasst plattenartige, ineinander übergehende Modulabschnitte, die einen Pyramidenstumpf bilden. D.h. einige der Modulabschnitte sind so dreidimensional angeordnet, dass sich das Keramikmodul (1) zu einer Seite hin verjüngt. Dadurch wird die bei der Befeuchtung einem Luftstrom ausgesetzte Oberfläche des Keramikmoduls (1) im Vergleich zu einer Keramikplatte massgeblich vergrössert, während der Luftwiderstand verkleinert wird.

A honeycomb filter (1) comprises a honeycomb structure having a large number of through channels (13) formed in the axial direction and partitioned by porous partition walls (2), wherein specified through channels (13) are plugged only on one end face (6) at the same side out of two end faces. This honeycomb filter (1) shows less pressure loss, and is hardly clogged with solids that cannot be extinguished by combustion such as ash, iron oxide, and the like. Furthermore, an unwanted discharge of particulates deposited in through channels (13) of the filter (1) in a larger amount due to pulsation even under conditions that the exhaust gas from an engine greatly pulsates can be effectively suppressed. This filter (1) is also usable as an element for exhaust gas purification system, or a part of composite filter in addition to the use for an exhaust gas purification filter for gasoline engines. The production method therefor is also disclosed.

Verfahren zur Herstellung von Bauteilen aus hochtemperaturbeständiger faserverstärkter Verbundkeramik aus Kohlenstofffaser-haltigen Bändern (1, 1'), Herstellen einer kraftschlüssigen Verbindung im Bereich der Kontaktzonen (4, 4') durch Erwärmen und gemeinsames Verfestigen unter Druck- und Temperatureinfluss, Carbonisieren des Vorkörpers (10) mindestens einmalige Nachverdichtung des Vorkörpers (10) gefolgt von einer Carbonisierung des so behandelten Vorkörpers (10), dadurch gekennzeichnet, dass die Bänder (1) von den benachbarten Bändern (1') im Bereich (7) außerhalb der Kontaktzonen (4, 4') durch Abstandshalter (3) aus Graphit getrennt werden, und in eine Spannvorrichtung, (5) die im wesentlichen aus Graphit besteht, eingelegt werden, so dass die Bänder (1) und die hieraus gebildeten Vorkörper (10) während der Verarbeitungsschritte fest fixiert sind, und Verwendung von so hergestellten Bauteilen als Werkstückträger, Träger für optische Bauteile sowie in der Luft- und Raumfahrt.

A ceramic filter assembly having improved exhaust gas processing efficiency. The ceramic filter assembly (9) is produced by adhering with a ceramic seal layer (15) outer surfaces of a plurality of filters (F1), each of which is formed from a sintered porous ceramic body. The seal layer (15) has a thickness of 0.3mm to 3mm and a thermal conductance of 0.1W/mK to 10W/mk.

An improved method for the fabrication of lightweight ceramic matrix composite panels, utilizing pressure forming with floating tooling to shape integral stiffeners such as raised integral surface channels on panel surfaces, is provided. The consolidation of green composite material against refractory floating tools by hot hydrostatic or isostatic (gas) pressing, followed by removal of the tooling, yields a strong, rigid, yet lightweight ceramic structure.

An improved method for the fabrication of lightweight ceramic matrix composite panels, utilizing pressure forming with floating tooling to shape integral stiffeners such as raised integral surface channels on panel surfaces, is provided. The consolidation of green composite material against refractory floating tools by hot hydrostatic or isostatic (gas) pressing, followed by removal of the tooling, yields a strong, rigid, yet lightweight ceramic structure.

Described are laminated structures consisting essentially of a light weight interior member prepared from a glass, glass-ceramic, or ceramic, an exterior member prepared from a glass, glass-ceramic, or ceramic, and a bonding member prepared from a glass, glass-ceramic, or ceramic. The light weight interior member may be composed of a porous body, a corrugated body, or a honeycomb body. In a preferred embodiment, at least one of said members is reinforced through the entrainment of ceramic fibers and/or whiskers. In the most preferred embodiment, each exterior and interior member is reinforced through the entrainment of ceramic fibers and/or whiskers and the bonding member is reinforced through the entrainment of ceramic whiskers.

Also described are bonded ceramic matrix composite structures such as ceramic panels or beams, and a method for making them, the structures comprising ceramic facing sheets to which are bonded one or an array of relatively thin-walled, hollow, high-stiffness channeled ceramic support elements (2), the support elements being of modular design with each support being formed by a continuous composite ceramic wall incorporating multidirectional fiber reinforcement and defining a central channel extending, in the bonded structure, in a direction generally parallel with the ceramic facing sheets (1).

Methods are shown for making these laminated and bonded composite structures.

A filter for molten metal prior to casting in a mold has a plurality of ceramic elements in contact with each other, each element (11) having numerous apertures, e.g. slots (13) separated by ribs (12), and the contacting portions (14) of the elements are arranged, so that the apertures (13) of adjacent elements are staggered so that the metal flowing out of one aperture passes through the space (16) between adjacent elements before flowing through aperture of the next element; thus fine filtration is achieved.

The distance (H) between the ribs of different elements is preferably less through the widths (W) of the aperture, e.g. H < 0.8 mm.

The elements may be flat plates rectangular in shape (Figs 1-3) or circular (Fig 4); orfrustro-conical (Figs 10-11) or tubular (Fig 13); in the latter cases they nest one inside each other. The apertures may be rows of circular holes (Fig 21-22). Successive elements may be identical or non- identical as regards their arrangement and size of apertures.

Elements can be made by injection molding and sintering of a ceramic, e.g. silica, and a binder; preferably they are microporous.

A filter for molten metal prior to casting in a mold has a plurality of ceramic elements in contact with each other, each element (11) having numerous apertures, e.g. slots (13) separated by ribs (12), and the contacting portions (14) of the elements are arranged, so that the apertures (13) of adjacent elements are staggered so that the metal flowing out of one aperture passes through the space (16) between adjacent elements before flowing through aperture of the next element; thus fine filtration is achieved.

The distance (H) between the ribs of different elements is preferably less through the widths (W) of the aperture, e.g. H < 0.8 mm.

The elements may be flat plates rectangular in shape (Figs 1-3) or circular (Fig 4); orfrustro-conical (Figs 10-11) or tubular (Fig 13); in the latter cases they nest one inside each other. The apertures may be rows of circular holes (Fig 21-22). Successive elements may be identical or non- identical as regards their arrangement and size of apertures.

Elements can be made by injection molding and sintering of a ceramic, e.g. silica, and a binder; preferably they are microporous.