Abstract: The bonded ceramic assembly of the present disclosure includes a first substrate made of ceramic, a second substrate made of ceramic, and a bonding layer positioned between the first substrate and the second substrate. The bonding layer contains aluminum, at least one of calcium and magnesium, a rare earth element, silicon, and oxygen. Out of a total 100 mass % of all of the components making up the bonding layer, the bonding layer contains from 33 mass % to 65 mass % aluminum in terms of oxide, a total of from 27 mass % to 60 mass % calcium and magnesium in terms of oxide, and from 2 mass % to 12 mass % rare earth element in terms of oxide. The silicon content, in terms of oxide, of the surface of the bonding layer is greater than the silicon content, in terms of oxide, of the interior of the bonding layer.

Abstract: A ceramic bonded body of the disclosure includes a first silicon carbide ceramics, a second silicon carbide ceramics, and a bonding layer positioned between the first silicon carbide ceramics and the second silicon carbide ceramics. The bonding layer contains 25 mass % or more metallic silicon, and 25 mass % or more silicon carbide assuming all components constituting the bonding layer as 100 mass %, and a total of the metallic silicon and the silicon carbide is 75 mass % or more, and the bonding layer further contains at least one of nickel silicide and chromium silicide.

Abstract: In the present disclosure, a flow path member includes a substrate, a flow path and a first oxide layer. The substrate contains non-oxide ceramics, and includes an outer surface. The flow path is in the substrate, and includes an inlet and an outlet. The first oxide layer is disposed on the outer surface.

Abstract: The bonded ceramic assembly of the present disclosure includes a first substrate made of ceramic, a second substrate made of ceramic, and a bonding layer positioned between the first substrate and the second substrate. The bonding layer contains aluminum, at least one of calcium and magnesium, a rare earth element, silicon, and oxygen. Out of a total 100 mass % of all of the components making up the bonding layer, the bonding layer contains from 33 mass % to 65 mass % aluminum in terms of oxide, a total of from 27 mass % to 60 mass % calcium and magnesium in terms of oxide, and from 2 mass % to 12 mass % rare earth element in terms of oxide. The silicon content, in terms of oxide, of the surface of the bonding layer is greater than in the interior of the bonding layer.

Abstract: A ceramic bonded body may include a first member, a second member, a joining layer between the first member and the second member, and a covering layer which covers the joining layer and is located over the first member and the second member. The first member and the second member may include aluminum nitride-based ceramic. The joining layer and the covering layer may include at least aluminum, calcium, yttrium, and oxygen where, in 100 mass % of all of the constituents configuring the joining layer and the covering layer, the aluminum is 21 mass % or more converted to oxides, the calcium is 21 mass % or more converted to oxides, and the sum of the aluminum and the calcium converted to oxides is 86 mass % or more. The covering layer has a content of yttrium converted to oxides greater than that of the joining layer.

Abstract: In the present disclosure, a flow path member includes a substrate, a flow path and a first oxide layer. The substrate contains non-oxide ceramics, and includes an outer surface. The flow path is in the substrate, and includes an inlet and an outlet. The first oxide layer is disposed on the outer surface.

Abstract: A ceramic bonded body of the disclosure includes a first silicon carbide ceramics, a second silicon carbide ceramics, and a bonding layer positioned between the first silicon carbide ceramics and the second silicon carbide ceramics. The bonding layer contains 25 mass % or more metallic silicon, and 25 mass % or more silicon carbide assuming all components constituting the bonding layer as 100 mass %, and a total of the metallic silicon and the silicon carbide is 75 mass % or more, and the bonding layer further contains at least one of nickel silicide and chromium silicide.

Abstract: A flow channel member according to the present invention includes a ceramic substrate, a flow channel inside the ceramic substrate through which a fluid flows, and multiple protrusions on an outer surface of the substrate.

Abstract: The heat exchanger is provided with: a plurality of first members including walls that have introduction holes on a first end side and discharge holes on a second end side, with spaces connecting the introduction holes and the discharge holes serving as first channels through which fluid flows; second members that communicate with the introduction holes at the first end side of the plurality of first members to introduce the first fluid to the first members; and third members that communicate with the discharge holes at the second end side of the plurality of first members to discharge the first fluid that has flowed through the first members. In at least one adjacent pair of the introduction holes, regions that overlap with opening regions of the upstream-side introduction holes exist in the walls including the downstream-side introduction holes, when viewed in a direction in which the first fluid flows.

Abstract: [Object] Provided are a flow channel member having high heat-exchange efficiency in addition to high corrosion resistance and high mechanical characteristics, a heat exchanger including the flow channel member, and a semiconductor module including the flow channel member. [Solution] A flow channel member 10 according to the present invention includes a ceramic substrate 1, a flow channel 3 inside the ceramic substrate 1 through which a fluid flows, and multiple protrusions 2 on an outer surface of the substrate 1. The flow channel member 10 according to the present invention having such a configuration has high heat-exchange efficiency in addition to high corrosion resistance and high mechanical characteristics.

Abstract: A silicon nitride substrate comprises a substrate comprising a silicon nitride sintered body, and a plurality of granular bodies containing silicon and integrated to a principal surface of the substrate, wherein a plurality of needle crystals or column crystals comprising mainly silicon nitride are extended from a portion of the granular bodies. A brazing material is applied to a principal surface of the substrate, and a circuit member and a heat radiation member are arranged on the applied brazing material, and bonded by heating. Because of a plurality of granular bodies integrated to the principal surface of the substrate, and a plurality of the needle crystals or the column crystals extended from a portion of the granular bodies, a high anchor effect is produced so that the circuit member and the heat radiation member are firmly bonded to the silicon nitride substrate.

Abstract: A silicon nitride substrate comprises a substrate comprising a silicon nitride sintered body, and a plurality of granular bodies containing silicon and integrated to a principal surface of the substrate, wherein a plurality of needle crystals or column crystals comprising mainly silicon nitride are extended from a portion of the granular bodies. A brazing material is applied to a principal surface of the substrate, and a circuit member and a heat radiation member are arranged on the applied brazing material, and bonded by heating. Because of a plurality of granular bodies integrated to the principal surface of the substrate, and a plurality of the needle crystals or the column crystals extended from a portion of the granular bodies, a high anchor effect is produced so that the circuit member and the heat radiation member are firmly bonded to the silicon nitride substrate.

Abstract: A ferrite core comprising a sintered oxide containing at least 48.6 to 53.9 mol % of Fe on Fe2O3 basis, 12.3 to 35.2 mol % of Ni on NiO basis and 16.4 to 37.0 mol % of Zn on ZnO basis as metal elements, and contains a crystal phase comprising two or more kinds of solid solutions selected from NiFe2O4, ZnFe2O4 and FeFe2O4, wherein full width at half maximum of a diffraction peak, of crystal phase of which diffraction angle 2? is in a range from 34.6 to 36.4° as measured by X-ray diffraction analysis using Cu—K? beam, is 0.4° or less.

Abstract: A ferrite core comprising a sintered oxide containing at least 48.6 to 53.9 mol% of Fe on Fe2O3 basis, 12.3 to 35.2 mol % of Ni on NiO basis and 16.4 to 37.0 mol % of Zn on ZnO basis as metal elements, and contains a crystal phase comprising two or more kinds of solid solutions selected from NiFe2O4, ZnFe2O4 and FeFe2O4, wherein full width at half maximum of a diffraction peak, of crystal phase of which diffraction angle 2? is in a range from 34.6 to 36.4° as measured by X-ray diffraction analysis using Cu—K? beam, is 0.4° or less.

Abstract: A hydraulic excavator includes a boom comprising an articulated first and second boom member, an arm, a bucket, a boom cylinder for operating the boom, an arm cylinder for operating the arm; and a bucket cylinder for operating the bucket. The boom cylinder is cooperatively associated with the boom to establish a geometry wherein, during operation, the axis of the boom cylinder can never pivot rearwardly across a dead point of the boom and therefore eliminate the possibility of dead locking of the boom during operation.