Abstract: A translucent polycrystalline sintered body is mainly composed of an alumina, is suitable for the manufacture of an arc tube for a high-intensity discharge lamp, and has an average grain diameter of 35 to 70 ?m, preferably 50 to 60 ?m. In a case where the sintered body is in a 0.5-mm-thick flat plate shape, the in-line transmittance of the sintered body is 30% or more, preferably 50% or more. In this case, the ratio between maximum and minimum in-line transmittance values is 2:1 to 1:1 in the visible region of 360 to 830 nm. The bending strength of the sintered body is 250 MPa or more, preferably 300 MPa or more.

Abstract: The inventive luminous vessel has strong bonding and improved adhesion of the current through conductor provided in the luminous container to a sealing member or the like. A luminous vessel has a luminous container, a solid current through conductor made of a metal or a cermet and a sintered body of a molded body containing at least metal powder fixed to the outside of the current through conductor.

Abstract: A sub-tank (13) is provided in an ink passage which conducts ink from an ink chamber (18) of a main tank (12) to an ink discharge head (11). The sub-tank includes an ink bag (20) and partition plates (52, 54). The ink bag (20) is made of a flexible material, and moreover is made so as to retain ink which flows along the ink passage in its interior. The partition plates (52, 54) are disposed so as to hold the ink bag (20) between them, and restrain the ink bag (20) so that it does not expand to larger than an expanded state which is determined in advance.

Abstract: The inventive structure has a reflector substrate comprising a brittle material, a first power supply member electrically connected to a first electrode and a second power supply member electrically connected to a second electrode. A first through hole and a second through hole are provided in the reflector substrate. The first power supply member is inserted into and fixed to a first through hole and the second power supply member is inserted into and fixed to the second through hole. A discharge lamp is supported by the reflector substrate through the power supply members, while the discharge lamp is distant from the reflector substrate.

Abstract: A luminous container has an electrode supporting member composed of a pipe-shaped metal piece. The electrode supporting member 8 has a clamped portion pressed and clamped with and non-clamped portions not clamped with a brittle material. The stress generated along a contact interface of the clamped portion and the brittle material is relaxed with the deformation of the electrode supporting member.

Abstract: A mold includes a gate communicating with the entire perimeter of a cavity serving as a space configured to form a molded article. A self-curable molding material with flowability is fed into the perimeter of the cavity through the gate; hence, the mold has a small number of dead ends compared with the case where, for example, the molding material is fed into the cavity through a part of the cavity, preventing the formation of bubbles left in the cavity. The arrangement of a gate and a bent each making an acute angle results in the spontaneous separation of the molded article in the cavity from solidified material portions in the gate and the vent due to shrinkage on curing.

Abstract: A first inorganic powder molded body 1A and a second inorganic powder molded body 1B are obtained. Each of the bodies contains an inorganic powder, an organic dispersion medium having a reactive functional group and a gelling agent and is solidified by chemical reaction of the organic dispersion medium and the gelling agent. Slurry 5A containing a powder component and an organic dispersion medium is applied to a joint surface 4A of the first inorganic powder molded body 1A. The inorganic powder molded bodies 1A and 1B are allowed to abut on each other while interposing the slurry 5A therebetween, and integrated together into a joined body. A sintered body is obtained by sintering the joined body.

Abstract: A composite luminous vessel container 3 has a hollow and polycrystalline alumina capillary 1 and one or more transparent disk(s) 2 of monocrystalline alumina. The polycrystalline alumina luminous container member 3 functions as a luminous part for a high intensity discharge lamp. Light is emitted from the inside of the polycrystalline alumina luminous member 3 and radiated through the transparent monocrystalline alumina disk to the outside. The light emitted through the transparent window has a low loss due to the scattering so that the lamp efficiency can be improved. In the case of the light emitted through the transparent monocrystalline alumina, the size of the light source is substantially equal to the distance between the electrodes, so that the light source can be utilized as a point light source. The light emitted from the point light source can be subjected to optical control by combination with reflectors or lenses.

Abstract: A structure 26 of brittle material and metal has brittle materials 24, 25 and a plate-shaped metal piece 21. The plate-shaped metal piece 21 has a clamped portion 22 pressed and clamped with the brittle material and a non-clamped portion 23 not clamped with the brittle material. The deformation of the plate-shaped metal piece relaxes stress generated along an interface where the clamped portion 23 and brittle materials 24, 25 contact each other.

Abstract: The present invention provides a sintered body of a joined body including two or more inorganic powder-molded bodies. The sintered body includes first components corresponding to the two or more inorganic powder-molded bodies in the joined body; and a second component corresponding to a junction in the joined body, and has one or both of the features (a) and (b): (a) the second component has a surface roughness equal to or lower than that of each of the first components; and (b) the second component has, in the vicinity of a width center thereof, a transmittance equal to or higher than that of each of the first components.

Abstract: The inventive structure has a reflector substrate 1 comprising a brittle material, a first power supply member 2A electrically connected to a first electrode 4A and a second power supply member 2B electrically connected to a second electrode 4B. A first through hole 1a and a second through hole 1b are provided in the reflector substrate 1. The first power supply member 2A is inserted into and fixed to a first through hole 1a and the second power supply member 2B is inserted into and fixed to the second through hole 1b. A discharge lamp 3 is supported with the reflector substrate 1 through the power supply members 2A and 2B, while the discharge lamp is distant from the reflector substrate 1.

Abstract: The inventive luminous vessel has a strong bonding and improved adhesion of a current through conductor 2 provided in a luminous container 9 to a sealing member 11C or the like. A luminous vessel has a luminous container 9, a solid current through conductor 2 made of a metal or a cermet and a sintered body 11C of a molded body containing at least metal powder fixed to the outside of the current through conductor 2.

Abstract: The present invention provides a composite body having a strong bonding and improved adhesion. A composite body 3 has a solid and elongate body 2 made of a metal and a sintered body 11 of metal powder fixed to the outside of the elongate body so that the sintered body applies a stress onto the outside of elongate body radially.

Abstract: A luminous container 1A has an electrode supporting member 8 composed of a plate-shaped metal piece. The electrode supporting member 8 has a clamped portion 8b pressed and clamped with and non-clamped portions 8a and 8c not clamped with a brittle material. The stress generated along a contact interface of the clamped portion 8b and the brittle material is relaxed with the deformation of the electrode supporting member 8.

Abstract: A structure 26 of brittle material and metal has brittle materials 24, 25 and a plate-shaped metal piece 21. The plate-shaped metal piece 21 has a clamped portion 22 pressed and clamped with the brittle material and a non-clamped portion 23 not clamped with the brittle material. The deformation of the plate-shaped metal piece relaxes stress generated along an interface where the clamped portion 23 and brittle materials 24, 25 contact each other.

Abstract: A base member made of a metal in which aluminum is included, ceramics in which an aluminum element is included, or a composition member constructed by a metal in which aluminum and ceramics are included, is provided in a container in which a solid fluorine compound such as NaHF2 is filled. Then, the container is heated at a temperature higher than a decomposing temperature of the solid fluorine compound. After that, the base member is subjected to a heat treatment with the decomposed gas of the solid fluorine compound to form a fluoride layer on a surface of the base member. In this manner, it is possible to obtain an anti-corrosion member which shows a high corrosion property with respect to the corrosion gas of halogen series and its plasma, particularly with respect to chlorine gas and its plasma.

Abstract: A corrosion-resistant member includes a substrate made of a ceramic material and having a diameter of at least 200 mm, and a film of chemically vapor deposited silicon carbide having a thickness of not less than 0.5 mm and covering at least such a portion of the surface of the substrate that is to contact a corrosive material. A process is disclosed for producing such a corrosion-resistant member, which process includes thermally treating the film at a temperature higher, by not less than 50° C. centigrade, than a film-forming temperature at which the film of silicon carbide is formed, after the formation of the silicon carbide film.

Abstract: An anti-corrosion ceramic member having a substrate made of a ceramic material, a surface layer made of a fluoride and formed on the substrate, and an intermediate layer formed between the substrate and the surface layer and having the ceramic material of the substrate and the fluoride.

Abstract: A base member made of a metal in which aluminum is included, ceramics in which an aluminum element is included, or a composition member constructed by a metal in which aluminum and ceramics are included, is provided in a container in which a solid fluorine compound such as NaHF2 is filled. Then, the container is heated at a temperature higher than a decomposition temperature of the solid fluorine compound. After that, the base member is subjected to a heat treatment with the decomposed gas of the solid fluorine compound to form a fluoride layer on a surface of the base member. In this manner, it is possible to obtain an anti-corrosion member which shows a high corrosion property with respect to the corrosion gas of halogen series and its plasma, particularly with respect to chlorine gas and its plasma.

Abstract: An anti-corrosion ceramic member having a substrate made of a ceramic material, a surface layer made of a fluoride and formed on the substrate, and an intermediate layer formed between the substrate and the surface layer and having the ceramic material of the substrate and the fluoride.