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    • 10. 发明授权
    • Process for a beta-phase nickel aluminide overlay coating
    • 一种β相镍铝覆盖涂层的工艺
    • US07244467B2
    • 2007-07-17
    • US10604368
    • 2003-07-15
    • Theodore Robert GrossmanRamgopal DaroliaJoseph David Rigney
    • Theodore Robert GrossmanRamgopal DaroliaJoseph David Rigney
    • C23C16/00
    • C23C14/5886C23C4/18C23C14/16C23C26/00C23C28/3215C23C28/345C23C28/3455
    • A process for forming a beta-phase nickel aluminide (NiAl) overlay coating that is suitable for use as a bond coat for a thermal barrier coating (TBC). The overlay coating is deposited by a method that produces a generally columnar grain structure in which grains extend through the coating such that at least some grain boundaries are open at the coating surface. The coating is then peened with a particulate media, followed by heating the overlay coating to a temperature sufficient to cause the overlay coating to recrystallize and form new grain boundaries that are not open to the outer surface of the coating and significantly less susceptible to accelerated oxidation than the original grain boundaries. The particulate media is formed of a composition containing nickel and aluminum, such that an oxide scale that forms on the surface of the coating after the peening operation is substantially free of deleterious oxide compounds, notably iron-containing spinels.
    • 用于形成适合用作热障涂层(TBC)的粘合涂层的β-相镍铝化物(NiAl)覆盖涂层的方法。 覆盖涂层通过产生大致柱状晶粒结构的方法沉积,其中晶粒延伸穿过涂层,使得至少一些晶界在涂层表面开口。 然后用颗粒介质对涂层进行喷丸处理,然后将覆盖涂层加热至足以使覆盖涂层再结晶并形成不对涂层外表面开放的新晶粒边界,并显着降低易受加速氧化影响的温度 比原来的晶界。 颗粒介质由包含镍和铝的组合物形成,使得在喷丸操作之后在涂层表面上形成的氧化皮基本上不含有害氧化物化合物,特别是含铁尖晶石。