摘要:
A method of transferring heat from a warmer stream of gas to a cooler stream of gas comprises flowing the warmer stream of gas through a heat exchanger in a manner such that the warmer stream of gas converges as the warmer stream of gas flows through the heat exchanger. The method further comprises flowing the cooler stream of gas through the heat exchanger in a manner such that the cooler stream of gas diverges as the cooler stream of gas flows through the heat exchanger. Another method comprises forming a heat exchanger by solid state welding a plurality of laminate members to each other. The heat exchanger may be a heatsink. The heat exchanger may also condense gas into a liquid.
摘要:
A process is provided for welding a nickel or cobalt based superalloy article to minimize cracking by preheating the entire weld area to a maximum ductility temperature range, maintaining such temperature during welding and solidification of the weld, raising the temperature for stress relief of the superalloy, then cooling at a rate effective to minimize gamma prime precipitation.
摘要:
A device is disclosed for guiding wires between two parts that may be rotated with a limited angle of rotation with respect to each other, preferably for guiding a plurality of wires in a cable. The object of the invention is to create a wire-guiding device that stresses less the strands or wires of a cable, in particular when the moment of inertia is small, and thus considerably increases their service life. The wires (14) are guided through the support (1) and housing (2) concentrically to the axis of rotation (11) and fixed in the axial direction. The length of the wires (14) between the support (1) and the housing (2) is larger than the distance between the rotatable parts. The wires bulge together inwards or outwards and form a right-hand or left-hand spiral with an expanding pitch every time their end swivelling positions are reached.
摘要:
A bi-metal medical guidewire with a core wire having a stainless steel proximal section and Nitinol distal section offers performance enhancements compared to guidewires made from either alloy alone. A solid-state, frictional welding or frictional joining process for Nitinol and stainless steel wires ranging in diameter from 0.013" to 0.020", without the need for tertiary metals, adhesive or ferrules is disclosed. The resulting frictional weld joint strength is approximately 80% of the tensile strength of the raw Nitinol wire with excellent bending properties.
摘要:
A conduction-cooled card assembly (100) is disclosed that includes a conduction-cooling frame (102), a printed wiring board (104) mounted on the frame, and a wedgelock fastener (122). The conduction- cooling frame has a thermal management interface (124) adapted to transfer heat from the frame to a chassis (128), and the wedgelock fastener is adapted to press the thermal management interface of the conduction-cooling frame against a rail of the chassis.. The assembly also has one or more of the following characteristics: (a) the thermal management interface of the conduction-cooling frame is made primarily of a first material and a portion of the thermal management interface that is adapted to engage the wedgelock fastener or the rail of the chassis is made of a second material that is softer than the first material, and (b) the wedgelock fastener is made primarily of a first material and a portion of the wedgelock fastener that is adapted to engage the thermal management interface or another rail of the chassis is made of a second material that is softer than the first material. A chassis for conduction-cooled card assemblies is also disclosed which comprises a housing and at least first and second rails within the housing that are adapted to receive a conduction-cooled card assembly therebetween. At least one of the first and second rails is made primarily of a first material and has a surface portion made of a second material that is softer than the first material.