Abstract: One object of the present invention is to provide a blade for forming ribs that is able to improve wear resistance; in order to achieve the object, the present invention provide a blade for forming ribs that forms ribs either on the surface of a substrate or via an undercoating layer on the surface of a substrate by moving a blade body in a fixed direction relative to a paste film in the state in which comb teeth formed on at least a portion of the periphery of said blade body are penetrated into said paste film formed on the surface of said substrate to plasticly deform said paste film; wherein, the surface of said comb teeth formed on said blade body that makes contact with said paste film is coated with a compound layer in which hard particles are dispersed in a metal.

Abstract: A paste film is formed by coating a paste onto the surface of a substrate. In a state in which comb-teeth formed on at least a portion of the periphery of a blade is thrust into the paste film, the blade or the substrate is moved in a certain direction, thus forming ceramic capillary ribs on the substrate surface. The paste should preferably contain from 30 to 95 wt. % glass powder or mixed glass/ceramics powder, from 0.3 to 15 wt. % resin, and from 3 to 70 wt. % solvent mixture (a solvent. a plasticizer and a dispersant), and the ceramic ribs on the substrate should preferably have an aspect ratio of from 1.5 to 10. The blade should preferably have a pitch P, a gap w and a depth h as expressed by 0.03 mm≦h≦1.0 mm and w/P≦0.9, and ribs are foamable on an insulating layer by keeping the blade spaced apart from the substrate surface.

Abstract: One object of the present invention is to provide a blade for forming ribs that is able to improve wear resistance; in order to achieve the object, the present invention provide a blade for forming ribs that forms ribs either on the surface of a substrate or via an undercoating layer on the surface of a substrate by moving a blade body in a fixed direction relative to a paste film in the state in which comb teeth formed on at least a portion of the periphery of said blade body are penetrated into said paste film formed on the surface of said substrate to plasticly deform said paste film; wherein, the surface of said comb teeth formed on said blade body that makes contact with said paste film is coated with a compound layer in which hard particles are dispersed in a metal.

Abstract: A paste film is formed by coating a paste onto the surface of a substrate. In a state in which comb-teeth formed on at least a portion of the periphery of a blade is thrust into the paste film, the blade or the substrate is moved in a certain direction, thus forming ceramic capillary ribs on the substrate surface. The paste should preferably contain from 30 to 95 wt. % glass powder or mixed glass/ceramics powder, from 0.3 to 15 wt. % resin, and from 3 to 70 wt. % solvent mixture (a solvent, a plasticizer and a dispersant), and the ceramic ribs on the substrate should preferably have an aspect ratio of from 1.5 to 10. The blade should preferably have a pitch P, a gap w and a depth h as expressed by 0.03 mm≦h≦1.0 mm and w/P≦0.9, and ribs are foamable on an insulating layer by keeping the blade spaced apart from the substrate surface.

Abstract: One object of the present invention is to provide a paste that is easily coated, has a comparatively long aging time and is able to maintain the shape of the ribs following plastic deformation; in order to achieve the object, the present invention provides a paste comprising 50-95% by weight of glass powder or glass-ceramic mixed powder, 0.1-15% by weight of a resin, and 3-60% by weight of a plurality of kinds of solvents, wherein each boiling point of the plurality of kinds of solvents differs by 30° C. or more; and, the plurality of kinds of solvents contain one or more low boiling point solvents which are low boiling point solvents having a boiling point from 100° C. to 180° C., and one or more high boiling point solvents which are high boiling point solvents having a boiling point from 190° C. to 450° C.

Abstract: A ceramic circuit board with a heat sink which has a long life under heat cycles. First and second aluminum plates are laminated and bonded onto both sides of a ceramic substrate through Al--Si-based brazing solders, respectively. A heat sink formed of an AlSiC-based composite material is laminated and bonded onto a surface of the first aluminum plate. The ceramic substrate is formed of AlN, Si.sub.3 N.sub.4 or Al.sub.2 O.sub.3. An Al alloy in the heat sink has an Al purity of 80-99% by weight, and the first or second aluminum plate has an Al purity not less than 99.98% by weight. The heat sink is laminated and bonded onto the first aluminum plate through the Al alloy in the heat sink.

Abstract: Highly heat-radiating ceramic packages comprising a multi-layer ceramic wiring board 11 to one surface of which is bonded a heat-radiating ceramic base plate 13 with first and second aluminum plates 31 and 32 bonded to both surfaces thereof, via the first aluminum plate 31 are free from warping and cracking, and have improved heat-radiation performance and lower weight and manufacturing cost. The ceramic base plate 13 and the multi-layer ceramic wiring board 11 may be constructed with the same or different types of ceramic which are selected from the group consisting of alumina, glass ceramic, aluminum nitride, mullite, and silicon carbide. The two aluminum plates 31 and 32 are bonded to the ceramic base plate 13 with an Al-Si brazing material. Improved levels of heat radiation performance are accomplished by bonding a heat-radiating ceramic base plate with an aluminum plate bonded thereto, to a multi-layer wiring board prepared even by low-temperature sintering.

Abstract: Disclosed is a hollow fiber filter module comprising a cylindrical casing having a liquid introducing nozzle at least at one end portion thereof and having a bundle of hollow fibers disposed in the casing, and wherein one end portion of the bundle is enclosed by a hollow, liquid flow control member, and the liquid introducing nozzle has a specific unique structure in which the inlet opening has a larger diameter than that of the hollow of the nozzle at any portion thereof. This hollow fiber filter module can advantageously be used in the so-called external pressure type filtration on a large scale. By the use of this filter module, the external pressure type filtration of a liquid can advantageously be stably performed for a prolonged period of time with a high filtration efficiency.

Abstract: There is disclosed the structure of a superconductive wiring fabricated on an insulating substrate comprising a conductive pattern having at least one wiring strip of a superconductive ceramic formed on the insulating substrate and a protective film covering the wiring pattern and formed of a basic oxide, the basic oxide hardly reacts with the superconductive ceramic because of the fact that most of the superconductive ceramics are bases, then the wiring strip is allowed to stay in the superconductive state for a prolonged period of time.

Abstract: An insulating substrate is used for fabrication of a thick film circuit and comprises a foundation of aluminum nitride and a surface film structure provided on the foundation, in which the foundation contains at least one oxidizing agent selected from the group consisting of an yttrium oxide and a calcium oxide ranging from 0.1% to 10% by weight for enhancing a stiffness of the foundation, and in which the surface film structure is of the multi-level surface film structure having a lower surface film of an aluminum oxide rapidly grown on the foundation in the presence of the oxidizing agent and an upper surface film containing a silicon oxide and a substance selected from the group consisting of a zirconium oxide, a titanium oxide and a boron oxide for enhancing the resistivity against a firing operation.

Abstract: An insulating substrate is used for fabrication of a thick film circuit provided with a conductive pattern made from a paste containing glass frits, and comprises a foundation containing an aluminum nitride and incidental impurities, and a multi-level surface film structure provided between the foundation and the conductive pattern and having a lower surface film of an aluminum oxide provided on a surface of the foundation, an intermediate surface film provided on the lower surface film and formed of a substance having a relatively small acidity and an upper surface film provided on the intermediate surface film and formed of a substance having a relatively large acidity, in which the substance with the large acidity rapidly reacts with the frits in a firing stage for enhancing the adhesion of the conductive pattern but the substance with the relatively small acidity restricts the consumption thereof, so that the total thickness of the multi-level film structure is decrased and, accordingly, the heat radiatio