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C129Y Overview and Properties

C129y Niobium Alloy Sheet

C129Y Overview and Properties

C129Y (also known as C-129Y) is a medium-strength and medium-plasticity niobium-based high-temperature alloy with niobium as the base and elements such as tungsten (W) and hafnium (Hf) added.
High-temperature mechanical properties: It can maintain high strength and toughness even at temperatures above 1000℃, making it suitable for use in high-temperature conditions such as engine combustion chambers and aerospace heat protection components.

C129y Niobium Alloy Rod

Oxidation resistance: Compared with pure niobium, the high-temperature oxidation resistance of C129Y is enhanced through alloying treatments (such as the addition of hafnium, zirconium, etc.), but in extremely high-temperature oxidation environments, coating protection (such as silicide coatings) may still be required to extend service life.

Processing performance: It has certain plasticity and can be processed into different forms of components such as plates, bars, and tubes through forging, rolling, welding and other processes.However, during the processing, the temperature and deformation rate need to be controlled to avoid material embrittlement.

Low-density characteristic: The density of niobium alloys is lower than that of traditional nickel-based superalloys (niobium density is approximately 8.57 g/cm3, while nickel-based alloys are about 8.0 - 9.0 g/cm3), which gives them an advantage in the aerospace field where weight reduction is highly demanded.

Aerospace: Widely used in rocket engine thrust chambers, high-temperature structural components of spacecraft (such as nozzles, combustion chamber linings), and thermal protection systems of hypersonic aircraft, etc.

Nuclear Industry: In nuclear reactors, it can be one of the candidate materials for high-temperature structural components or cladding materials, due to its excellent heat resistance and radiation resistance properties.

Other high-temperature fields: such as the high-temperature heating elements of industrial furnaces, and the structural components of high-temperature testing equipment, etc.

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    • C129Y chemical composition

    Chemical Composition/% Chemical Composition/10-6
    Nb W Mo Ta V Hf Zr Ti C O N
    Balance 10 - - - 10 - 0.2Y 150 225 150

    C129Y mechanical property

    Composition Nb-10W-10Hf-0.5Ta-0.7Zr-0.1Mo-0.4Y
    Density/g·cm-3 9.5
    Temperature /˚C 2399
    Coefficient of Line-expansion/10-6K-1 4.73 (1371˚C)
    Recrystallization Temperature/˚C 1038 - 1093
    Anneal Temperature/˚C 980
    Elongation Brittle Transition Temperature/˚C -196
    Tensile Strength in room temperature MPa 400-600
    Elongation in room temperature % 20-30

    C129Y Product Type and Applications

    Rod/Bar: C129Y niobium alloy bar material can be used to manufacture some structural components that require high strength and high-temperature resistance, such as certain supporting structures in the aerospace field, etc.
    Tube/Pipe: This pipe material possesses excellent high-temperature resistance and corrosion resistance, and can be used for transporting high-temperature fluids, such as fuel pipelines in rocket engines, etc.
    Sheet/Plate: The plates can be processed into various shaped components, such as the protective parts for space shuttles and manned aircraft, as well as the extension sections of the thrust chambers of rocket engines.
    Other products: It can also be made into standard components such as rivets, bolts and nuts, which are used for connecting and fixing the structures of aerospace vehicles, etc. Moreover, it is reported that the C129Y alloy can also be used to manufacture heat pipes, beam reinforcement components, and space shuttle heat shielding materials, etc.