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    • 7. 发明公开
    • Method for replacing a damaged TBC ceramic layer
    • Methode um einebeschädigteTBC Keramikschicht zu ersetzen
    • EP1304446A1
    • 2003-04-23
    • EP02255682.3
    • 2002-08-14
    • GENERAL ELECTRIC COMPANY
    • Rigney, Joseph DavidAzer, Magdi Naim
    • F01D5/28C23C4/02
    • C23C28/321C23C4/02C23C28/3455F01D5/005F01D5/288F05D2230/13F05D2230/80F05D2230/90F05D2300/611Y02T50/67Y02T50/673Y10T29/49318
    • The present invention is a method for repairing a TBC ceramic top coat in local regions that have experienced a mechanical or thermally-induced spallation event leaving the underlying bond coat intact. A novel combination of groove design (i.e. spacing, pattern and depth) and laser-surface incident angles fabricated into the remaining bond coat is used to achieve spallation resistance equal to or greater than baseline after applying and maintaining a TBC ceramic patch to the localized areas of spallation. The method is particularly useful, but not limited to, repair of coating systems comprised of physical vapor deposited (PVD) ceramic top coats. In a preferred embodiment, the method of the present invention comprises (1) cleaning the exposed spalled region, (2) treating a limited portion of the bond coat by a grooving process with two linear arrays of equally spaced grooves intersecting at a preselected angle so as to texture the surface, and (3) depositing a ceramic material on the surface of the spalled / textured portion of the bond layer. The grooving process is accomplished with a high energy beam.
    • 本发明是一种在局部区域修复TBC陶瓷面漆的方法,其经历机械或热诱导的剥落事件,使得底层粘结涂层完好无损。 使用制造到剩余粘结涂层中的槽设计(即间距,图案和深度)和激光表面入射角的新颖组合来实现在将TBC陶瓷贴片应用并保持在局部区域之后等于或大于基线的剥离阻力 的剥落。 该方法特别有用,但不限于,修复由物理气相沉积(PVD)陶瓷顶涂层组成的涂层体系。 在一个优选实施例中,本发明的方法包括(1)清洁暴露的剥落区域,(2)通过切槽工艺处理有限部分的粘结涂层,其中两个线性阵列具有以预选角度相交的等间距凹槽, 以便(3)在接合层的剥离/纹理化部分的表面上沉积陶瓷材料。 开槽过程是用高能束实现的。