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    • 24. 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。
    • 29. 发明申请
    • METHOD FOR REPAIRING COATED COMPONENTS USING NIAL BOND COATS
    • 使用NIAL BOND COATS修复涂层组件的方法
    • US20060029723A1
    • 2006-02-09
    • US10714430
    • 2003-11-13
    • Joseph RigneyChing-Pang LeeRamgopal Darolia
    • Joseph RigneyChing-Pang LeeRamgopal Darolia
    • C23C16/52B05D3/00
    • B23P6/002C23C10/02C23C10/60C23C28/321C23C28/3215C23C28/345C23C28/3455C23C28/36C25D3/50C25D7/00C25D7/008F05B2230/31F05B2230/90F05C2253/12
    • According to an embodiment of the invention, a method for repairing a coated high pressure turbine blade, which has been exposed to engine operation, to restore coated airfoil contour dimensions of the blade, and improve upon the prior bond coat is disclosed. The method comprises providing an engine run high pressure turbine blade including a base metal substrate made of a nickel-based alloy and having thereon a thermal barrier coating system. The thermal barrier coating system comprises a diffusion bond coat on the base metal substrate and a top ceramic thermal barrier coating comprising a yttria stabilized zirconia material. The top ceramic thermal barrier coating has a nominal thickness t. The method further comprises removing the thermal barrier coating system, wherein a portion of the base metal substrate also is removed, and determining the thickness of the base metal substrate removed. The portion of the base metal substrate removed has a thickness, Δt. The method also comprises applying a β phase NiAl overlay coating to the substrate, and determining the difference in thickness, Δx, between the β phase NiAl overlay coating and the previously removed bond coat. The method further comprises reapplying the top ceramic thermal barrier coating to a nominal thickness of t+Δt-Δx, wherein Δt compensates for the portion of removed base metal substrate. Advantageously, the coated airfoil contour dimensions of the high pressure turbine blade are restored to about the coated dimensions preceding the engine run.
    • 根据本发明的实施例,公开了一种已经暴露于发动机操作的用于修复涂覆的高压涡轮机叶片以恢复叶片的被覆翼型轮廓尺寸并改进先前的粘结涂层的方法。 该方法包括提供一种发动机运行的高压涡轮叶片,其包括由镍基合金制成的基底金属基底并且具有热障涂层系统。 热障涂层系统包括在基底金属基底上的扩散粘合涂层和包含氧化钇稳定的氧化锆材料的顶部陶瓷热障涂层。 顶部陶瓷热障涂层具有标称厚度t。 该方法还包括去除热障涂层系统,其中基底金属衬底的一部分也被去除,并且确定移除的母体金属衬底的厚度。 去除的贱金属基材的部分厚度为Deltat。 该方法还包括将β相NiAl覆盖涂层施加到基底上,并确定β相NiAl覆盖涂层与先前去除的粘结涂层之间的厚度差异Deltax。 该方法还包括将顶部陶瓷热障涂层重新施加到t + Deltat-Deltax的标称厚度,其中Deltat补偿去除的基底金属基底的部分。 有利地,高压涡轮机叶片的被覆翼型轮廓尺寸恢复到发动机运行之前的涂层尺寸。