Abstract:
A seal formed between two parts that will remain gas tight in high temperature operating environments which experience frequent thermal cycling, which is particularly useful as an insulating joint in solid oxide fuel cells. A first metal part is attached to a reinforcing material. A glass forming material in the positioned in between the first metal part and the second part, and a seal is formed between the first metal part and the second part by heating the glass to a temperature suitable to melt the glass forming materials. The glass encapsulates and bonds at least a portion of the reinforcing material, thereby adding tremendous strength to the overall seal. A ceramic material may be added to the glass forming materials, to assist in forming an insulating barrier between the first metal part and the second part and to regulating the viscosity of the glass during the heating step.
Abstract:
Assemblage par brasage entre une pièce métallique à base de titane et une pièce en matériau céramique à base de carbure de silicium (SiC) et/ou de carbone. Cet assemblage comporte une structure empilée comportant les éléments suivants assemblés deux à deux par brasage : la pièce métallique (10) à base de titane, un premier intercalaire (11) apte à se déformer pour accommoder un différentiel de dilatation entre la pièce métallique (10) et une pièce en matériau céramique (20) à base de carbure de silicium et/ou de carbone, un deuxième intercalaire (12) rigide, de coefficient de dilatation proche de celui de ladite pièce en matériau céramique (20) en nitrure d'aluminium (AIN) ou en tungstène (W), et la pièce en matériau céramique (20).
Abstract:
A method of manufacturing metal to glass, metal to metal and metal to ceramic connections to be used in SOFC applications, said connections being produced as a mixture of a base glass powder and a metal oxide powder. As a result, the inherent properties of the glass used in the composite seals may be altered locally in the metal-coating interface by adding e.g. MgO in order to control the viscosity and wetting, and at the same time maintain the bulk properties such as high coefficient of thermal expansion of the basic glass towards the seal components.
Abstract:
A method for bonding at least two parts, at least one part comprising silicon carbide, the method comprising forming a layer of silica on the silicon carbide surface, and applying to it a bonding solution that includes hydroxide ions. Once this is done, the part that is to be bonded to the silicon carbide is moved into contact with the solution coated silica surface.
Abstract:
Die Temperatureinflüssen eines äusseren Mediums (20) aussetzbare Verbindung eines insbesondere keramischen Bauteils (2) mit einem insbesondere metallischen Bauteil (1) umfasst eine erste Klebstoffverbindung (14) zwischen dem metallischen und dem keramischen Bauteil und eine zweite Kelbstoffverbindung (22), deren Klebstoff (16) eine höhere Elastizität als der Klebstoff (10) der ersten Klebstoffverbindung (14) aufweist und die so angeordnet ist, dass ein unmittelbarer Kontakt der ersten Klebstoffverbindung (14) mit dem äusseren Medium (20) verhindert ist. Die Verbindung findet z.B. bevorzugt Verwendung bei einer Sensorbaugruppe eines Messgeräts, die in ein zu untersuchendes Medium einbringbar ist.
Abstract:
A joining method capable of simply joining high-purity ceramic parts, a high-strength joint for withstanding even a high-temperature environment, and accommodating complex shapes. A joining method for high-purity ceramic parts, wherein high-purity ceramic parts (10(1)), (10(2)) are disposed with the adhesion between joining portions (13(1)), (13(2)) ensured or with a gap kept therebetween, and a CVD-SiC film (23) is formed on the surface thereof to form a joining body (30).
Abstract:
Glass-ceramic sealants (1) for ceramic membrane reactors (2), ceramic membrane sealed to holders or substrates (3) and methods of making seals between two ceramic materials or between a ceramic and a metal or a metal alloy are provided. These sealants (1) combine silicate glass-ceramic materials with selected metal oxides and, optionally, materials similar or identical to the materials being sealed, and employ thermal processing so that the resultant materials will have a thermal expansion coefficient that substantially matches the thermal expansion coefficients of the two materials. Surfaces of the ceramic sealant that are exposed to reactive atmospheres can be protected by providing a metal or metallic alloy layer (20) over the ceramic seal (1).
Abstract:
The invention relates to a composite plate (14) which comprises a ceramic plate (10), especially an electrically insulating oxide ceramic plate. Said ceramic plate is linked at least on one side to a metal sheet (11) via a thin reaction zone (13) across its surface and in positive material fit. Said reaction zone (13) contains a solidified eutectic melt of the metal of which the metal sheet (11) substantially consists. The invention provides a means of simplifying the production while improving the properties of use of such a plate by using a silver sheet for the metal sheet (11).
Abstract:
The invention relates to a method for processing a component or a component arrangement using electromagnetic radiation, wherein the component or the component arrangement consists of at least two materials disposed one after the other in the direction of radiation of the electromagnetic radiation, wherein electromagnetic radiation having a first wavelength and electromagnetic radiation having at least one second wavelength are directed to the component or component arrangement and wherein the first and second wavelengths of the electromagnetic radiation are selected in such a way that electromagnetic radiation having the first wavelength is less absorbed by the first material of the component or component arrangement than by the second material disposed behind the first material in the direction of radiation of the electromagnetic radiation while the electromagnetic radiation having the second wavelength is greater absorbed by the first material than by the second material.
Abstract:
Sealing materials for making heat-resistant seals in electrical discharge devices comprise a rare earth oxide, such as lanthanum oxide, and boric oxide, preferably together with minor amounts of phosphorus pentoxide, aluminium oxide and magnesium oxide. Preferred compositions comprise 55 to 95 percent lanthanum or other oxide, 5 to 45 percent boric oxide and 0 to 5 percent phosphorus pentoxide, 0 to 5 percent aluminium oxide and 0 to 5 percent magnesium oxide. The compositions can be made by mixing the oxides, or appropriate salts, calcining the mixture at up to 1200 C and crushing it to a powder. They may be used as frits in a slurry or formed into pressed elements such as discs or washers. Sealing can be accomplished by heating the surfaces to be joined, together with the interposed sealing composition, to a temperature between 1100 and 1650 C.