Abstract:
The present invention is directed to a multifunction structure (MFS) (20) in which electrical/electronic componentry (26), thermal control (22), (44) and structural support (22) are integrated into a monolithic structure (20) that is particularly useful in spacecraft applications. The multifunctional structure (20) is also designed to be modular so that the electrical/electronic componentry (26) can be repaired or replaced.
Abstract:
The present invention is directed to a multifunction structure (MFS) in which electrical/electronic componentry, thermal control and structural support are integrated into a monolithic structure that is particularly useful in spacecraft applications. The multifunctional structure is also designed to be modular so that the electrical/electronic componentry can be repaired or replaced.
Abstract:
A printed circuit board assembly and process for assembling such a board involving interconnecting multi-layer printed circuit or printed wiring boards by simultaneously making eletrical interconnects and filling interstitial void spaces. A plurality of printed circuits boards (102, 104) to be interconnected are provided. Each board has conductive pads (106, 108) which are to be interconnected. The boards (102, 104) are aligned so that the conductive pads (106, 108) to be interconnected are opposite each other. A z-axis conductive member (110) is provided between opposing faces of the printed circuit boards (102, 104). The printed circuit boards (102, 104) are laminated with the z-axis conductive member (110), whereby the conductive pads (106, 108) are interconnected by the z-axis conductive member (110). The z-axis conductive member (110) comprises a planar, open cell, porous material having an x, y and z-axis with a series of electrically isolated, vertically defined cross section areas that extend from one side of the material to another side of the material and are covered with conductive metal, and contains a bonding adhesive in the porous material. Electronic devices may be attached to the printed circuit board assembly.
Abstract:
An assembly of two or more microelectronic parts, wherein electrical and/or thermal interconnection between the parts is achieved by means of multiple, discrete, conductive nanoscopic fibrils (15) or tubules (15) fixed within the pores of an insulating film (16). Such a film is said to have anisotropic electrical conductivity, i.e., Z-axis conductivity, with little or no conductivity in the other directions.
Abstract:
A method of fabricating a metal matrix composite (30) containing electrically isolated areas (34, 36, 38) and the MMC (30) formed from the method. The method comprises: (a) providing a liquid pool of unreinforced aluminum alloy; (b) infiltrating the unreinforced aluminum alloy (46) into a stack comprising upper and lower porous preforms and an electrical insulator material (42) placed between the preforms; (c) solidiying the liquid-phase metal to form a metal matrix composite product that completely surrounds the stack; and (d) forming at least one groove in the solidified metal, the groove extending downward to the insulating substrate so as to electrically isolate at least one region on the surface of the metal matrix composite.
Abstract:
A process for roughening a metal surface is provided comprising applying a coating to the metal surface wherein the coating is a temporary barrier to an etchant attacking the metal surface and the coating is susceptible to the etchant gradually removing the coating, and then etching the coated metal surface with an aqueous bath containing the etchant effective to produce a roughened metal surface.
Abstract:
Ceramic-metal composites are used in the fabrication of components for engines, particularly internal combustion engines. The components are made by infiltrating a molten metal (245) into a porous ceramic matrix (235) and cooling the metal to form a composite (255). Numerous engine components can be fabricated using this technique including valves, valve seats, exhaust port liners, pistons and rocker arms.
Abstract:
The present invention relates to a printed circuit board provided with electrical contact devices (7) and intended to be mounted in the back plane of a card frame (2) such as to form a magazine (1) in which printed circuit cards (6) having electrical contact devices (8) corresponding to the contact devices (7) on the board can be inserted at right angles to the back plane. The circuit board (3) forms an electrical connecting unit for the circuit cards in the back plane of the magazine. In accordance with the invention, the circuit board is configured to provide a self-supporting and stiffening structure in the form of a sandwich element (10).
Abstract:
Polymer (preferably polyimide) sheets (10) with laser ablated through-holes plated with metal (20) are used for making electrical connections to specified microcircuits, especially unbumped microchips and Tape Automated Bonding (TAB) articles. Bonding with different melting-point materials at opposite ends of the plated holes is disclosed. Preferred polyimides are those derived from polymerisation of 4,4'-biphenyldianhydride and (4,4'-diaminobiphenyl, or 4,4'-diaminobiphenylether, or phenylenediamine, preferably p-phenylenediamine).
Abstract:
Die Erfindung betrifft ein Verfahren zum Herstellen eines Fahrzeugbauteils (1) mit einer daran angeordneten elektrischen Leitstruktur (3), die sich wenigstens zwischen einer ersten elektrischen Kontaktstelle (4) zum Einspeisen und einer davon beabstandeten, zweiten elektrischen Kontaktstelle (5) zum Abgreifen eines elektrischen Stroms erstreckt. Erfindungsgemäß wird das Fahrzeugbauteil (1) bereitgestellt. Dann wird die Leitstruktur (3) durch Aufbringen eines geschäumten, elektrisch leitfähigen Metallwerkstoffs auf eine Fläche (2) des Fahrzeugbauteils (1) urgeformt. Und zwar derart, dass sich der Metallwerkstoff durchgängig zwischen den wenigstens zwei elektrischen Kontaktstellen (4, 5) erstreckt. Ferner betrifft die Erfindung auch ein Fahrzeugbauteil (1) mit einer geschäumten elektrischen Leitstruktur (3)