NIOBIUM-BASED ALLOY STRENGTHENED BY SILICIDE AND TURBINE HAVING TURBINE COMPONENT FORMED FROM

    公开(公告)号:US20240247345A1

    公开(公告)日:2024-07-25

    申请号:US18156655

    申请日:2023-01-19

    CPC classification number: C22C27/02 C22C32/0078

    Abstract: A niobium-silicide based alloy and a turbine having at least a turbine component formed from the niobium-silicide based alloy are provided. The niobium-silicide based alloy comprises: between about 14 atomic percent and about 24 atomic percent titanium (Ti); between about 11 atomic percent and about 19 atomic percent silicon (Si); between about 4 atomic percent and about 8 atomic percent chromium (Cr); between about 2 atomic percent and about 6 atomic percent hafnium (Hf); up to about 4 atomic percent aluminum (Al); between about 0.5 atomic percent and about 1 atomic percent tin (Sn); between about 5 atomic percent and about 15 atomic percent tantalum (Ta); between about 1 atomic percent and about 5 atomic percent tungsten (W); up to about 5 atomic percent rhenium (Re); up to about 5 atomic percent zirconium (Zr); up to about 6 atomic percent yttrium (Y); and a balance of niobium (Nb).

    Solid state diffusion bonding of refractory metals and their alloys

    公开(公告)号:US11654504B1

    公开(公告)日:2023-05-23

    申请号:US17472438

    申请日:2021-09-10

    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 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, such as any of carbon, silicon, chromium, iron, cobalt, and nickel. 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.

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