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    • 26. 发明授权
    • Processing of nickel aluminide material
    • 镍铝材料的加工
    • US06571857B2
    • 2003-06-03
    • US10037127
    • 2001-11-07
    • Ramgopal DaroliaJoseph David Rigney
    • Ramgopal DaroliaJoseph David Rigney
    • B22D2700
    • C22C1/023
    • A process for casting and preparing an ingot of a beta-phase NiAl-based material, particularly for use in PVD coating processes. The method entails melting a nickel-aluminum composition having an aluminum content below that required for stoichiometric beta-phase NiAl intermetallic so as to form a melt that includes nickel and Ni3Al. Aluminum is then added to the melt, causing an exothermic reaction between nickel and aluminum as the melt equilibrium shifts from Ni3Al to NiAl. However, the aluminum is added at a rate sufficiently low to avoid a violent exothermic reaction. The addition of aluminum continues until sufficient aluminum has been added to the melt to yield a beta-phase NiAl-based material. The beta-phase NiAl-based material is then solidified to form an ingot, which is then heated and pressed to close porosity and homogenize the microstructure of the ingot.
    • 一种用于铸造和制备β相NiAl基材料的锭的方法,特别是用于PVD涂覆工艺。 该方法需要熔化铝含量低于化学计量的β相NiAl金属间化合物所需的铝 - 铝组合物,以形成包括镍和Ni3Al的熔体。 然后将铝加入到熔体中,当熔体平衡从Ni3Al转变为NiAl时,引起镍和铝之间的放热反应。 然而,以足够低的速率加入铝以避免剧烈的放热反应。 继续加入铝,直到足够的铝加入到熔体中以产生β相NiAl基材料。 然后将β相NiAl基材料固化以形成锭,然后将其加热和压制以闭合孔隙并均匀化锭的微观结构。