Disclosed is a method of manufacturing a multilayer zirconia block for artificial teeth, including a first material mixing step of mixing a 3 mol % yttrium oxide-tetragonal zirconia polycrystal and an organic binder, a second material mixing step of mixing a 3 mol % yttrium oxide-tetragonal zirconia polycrystal, a 5 mol % yttrium oxide-tetragonal zirconia polycrystal and an organic binder, a third material mixing step of mixing a 5 mol % yttrium oxide-tetragonal zirconia polycrystal and an organic binder, a compression molding step of sequentially placing the mixtures obtained in the first material mixing step, the second material mixing step, and the third material mixing step in a mold for compression molding and performing compression molding, and a calcination step of calcining a compression molded product obtained in the compression molding step. This method provides a multilayer zirconia block that contains yttrium oxide, the amount of which is adjusted in the manufacturing process, thus showing a color similar to that of natural teeth after impregnation with a coloring solution.

A preform intended for the production of a dental prosthesis. The preform includes a group of agglomerated ceramic, glass-ceramic or glass particles, such that, as volume percents: more than 40% and less than 90% of the particles of said group have a size greater than 0.5 ?m and less than 3,5 ?m, said particles hereinafter being denoted enamel particles, and more than 10% and less than 60% of the particles of said group have a size greater than 3.5 ?m and less than 5.5 ?m, said particles hereinafter being denoted dentine particles. The microstructure of the preform is such that there is an axis X, termed axis of variation, along which the Ve/(Ve+Vd) ratio changes continuously, Ve and Vd denoting the volume percents of enamel particles and of dentine particles, respectively. The enamel and dentine particles representing, together, more than 90% of the volume of the agglomerated particles.

A joined body 20 includes a first member 22 having a thermal expansion coefficient of 8 ppm/K or less, a second member 24 having a thermal expansion coefficient of 12 ppm/K or more, and a joining portion 30 composed of an electrically conductive oxide containing 50% by mass or more of a spinel-type ferrite phase, the joining portion 30 joining the first member and the second member. The electrically conductive oxide preferably contains Fe and element A (where element A represents one or more selected from the group consisting of Mg, Mn, Co, Ni, Cu, and Zn). The molar ratio of element A to Fe, i.e., A/Fe, is 0.5 or less.

A brake component is disclosed. In various embodiments, the brake component includes a ceramic matrix composite (CMC) structure including a plurality of nominally dense plies, interleaved with a plurality of interlayers, wherein the plurality of nominally dense plies and the plurality of interlayers are bonded by at least one of a Field Assisted Sintering Technique (FAST), a Spark Plasma Sintering (SPS) process, or a localized heating process. In various embodiments, the brake component is a rotor disk or a stator disk.

A joined body 10 includes a ceramic body 12, a metal member 14, and a joint portion 15 that joins the ceramic body 12 and the metal member 14 together. The joint portion 15 includes a first joint layer 16 joined to the ceramic body 12 and a second joint layer 18 joined to the metal member 14. The first joint layer 16 is disposed on the ceramic body 12 side and contains an alloy that contains Fe and Cr as main components, and a compound having a thermal expansion coefficient of 4.010.sup.6 (/ C.) or lower is dispersed in the first joint layer 16. The second joint layer 18 is disposed on the metal member 14 side, contains an alloy that contains Fe and Cr as main components, and has a larger thermal expansion coefficient than the first joint layer 16.

Materials that seamlessly transition from opaque to transparent or translucent, such as advanced geopolymer-based ceramics to glass structures, which can be directly and seamlessly bonded without the use of an intermediate adhesive or use of a frame are disclosed. That is, a GP-based ceramic to glass structure can be bonded directly and seamlessly and without any mechanical joints, connective tissue or adhesives such as caulking or epoxy. Such ceramic to glass materials can be prepared by sintering an engineered geopolymer with glass to form the geopolymer-based advanced ceramic-glass structure in which the interface is visually abruptly or in which the material is a graded composition with a controlled transition from one material to the other.

A method is described of producing a catalyst-containing composite oxygen ion membrane and a catalyst-containing composite oxygen ion membrane in which a porous fuel oxidation layer and a dense separation layer and optionally, a porous surface exchange layer are formed on a porous support from mixtures of (Ln.sub.1?xA.sub.x).sub.wCr.sub.1?yB.sub.yO.sub.3?? and a doped zirconia. Adding certain catalyst metals into the fuel oxidation layer not only enhances the initial oxygen flux, but also reduces the degradation rate of the oxygen flux over long-term operation. One of the possible reasons for the improved flux and stability is that the addition of the catalyst metal reduces the chemical reaction between the (Ln.sub.1?xA.sub.x).sub.wCr.sub.1?yB.sub.yO.sub.3?? and the zirconia phases during membrane fabrication and operation, as indicated by the X-ray diffraction results.

The bonded body of the present invention includes: a ceramic member made of ceramics; and a Cu member which is made of Cu or a Cu alloy and bonded to the ceramic member through a CuPSn-based brazing filler material and a Ti material, wherein a CuSn layer, which is positioned close to the ceramic member and in which Sn forms a solid solution with Cu, and a Ti layer which is positioned between the Cu member and the CuSn layer, are formed at a bonded interface between the ceramic member and the Cu member, a first intermetallic compound layer made of Cu and Ti is formed between the Cu member and the Ti layer, and a second intermetallic compound layer containing P is formed between the CuSn layer and the Ti layer.

The present invention provides a metal-ceramic base material and the like which allow a ceramic base material and a desired metal material to be easily joined. A metal-ceramic base material (30) to be joined to a metal material (40), includes: a ceramic base material (20); and a metal film (25) provided on the ceramic base material (20), the metal film (25) being formed by thermal spray of a mixed powder material containing aluminum, alumina, and nickel, at least part of the nickel being exposed on a surface of the metal film (25).

A unitary ceramic component is provided that includes a first ceramic component; a second ceramic component; and a series-hybrid joint coupling the first ceramic component to the second ceramic component. The series-hybrid joint includes a first bonding interface coupling the first ceramic component and the second ceramic component and a second bonding interface coupling the first ceramic component and the second ceramic component. The first bonding interface exhibits properties that are different from the second bonding interface.