Solid state diffusion bonding of refractory metals and their alloys

    公开(公告)号:US11833606B1

    公开(公告)日:2023-12-05

    申请号:US18127632

    申请日:2023-03-28

    CPC classification number: B23K20/023 C22C27/02 B23K2103/08

    Abstract: A solid-state bonding method sandwiches an intermediate layer between a pair of refractory metal members, e.g., of niobium, tantalum, and alloys, to form a composite bonding assembly. This sandwiching can be repeated with multiple refractory metal members. The intermediate layer is substantially uniform of at most 75 μm thickness and composed of a material that is soluble and diffusive in the refractory metal members, e.g., of iron, nickel, cobalt, chromium, silicon, or carbon. Compressive pressure is applied, and the assembly is heated to a specified elevated temperature of at least 1280° C. The applied pressure and elevated temperature are maintained until the intermediate layer has dissolved surface oxides and asperities in the refractory metal members and has completely diffused into the refractory metal to create a seamless refractory metal bond. The pressures and temperatures needed are much lower than those required in direct diffusion bonding of refractory metals.

    METHODS OF FORMING OBJECTS BY DIFFUSION WELDING OF FOILS

    公开(公告)号:US20190151979A1

    公开(公告)日:2019-05-23

    申请号:US16098487

    申请日:2017-05-03

    Abstract: A first method of forming an object (400) includes wrapping foil around a preform (305) to provide a multi-layered structure including a plurality of layers of wrapped foil, and diffusion bonding the plurality of layers and the preform (305) together to form the object (400). A second method of forming an object includes wrapping foil around a preform (305) to provide a multi-layered structure comprising a plurality of layers of wrapped foil, removing the preform (305) from the multi-layered structure, and diffusion bonding the plurality of layers together to form the object (400). A third method of forming an object includes stacking a plurality of layers of foil to provide a multi- layered structure, diffusion bonding the plurality of layers together, and shaping the diffusion bonded multi-layered structure to form the object (400).

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