公开(公告)号：US20040081767A1

公开(公告)日：2004-04-29

申请号：US10281544

申请日：2002-10-28

Applicant: General Electric

Inventor： Jeff Pfaendtner ,  James Ruud ,  Ted Grossman ,  Peter Meschter ,  Joseph Rigney

IPC: C23C016/00 ,  B05D001/36

CPC classification number: C23C8/04 ,  C23C14/04 ,  Y02T50/67

Abstract: A masking material and a method for applying the masking material to preselected surfaces of a component to protect the surfaces to which the masking material is applied from exposure to a vapor phase of aluminum gas while a protective environmental coating is applied to other surfaces of the component. The component, such as found in the hot section of a gas turbine engine, typically has intricate internal passageways. A ceramic material is applied as a mask over preselected surfaces while leaving remaining surfaces of a component exposed. The component typically is a superalloy component, and the exposed surfaces are to be coated with an environmental protective coating. The surfaces are preselected on the basis of whether coating is desired on the surface. The ceramic material forms a continuous, crack-free mask on these preselected surfaces without obstructing the internal passageways. The ceramic material which forms a mask is stable at the elevated temperatures of environmental coating application. The ceramic mask material must be continuous and substantially crack-free to prevent the penetration of the aggressive gas phase of the environmental coating material onto the surface of the component where it would otherwise undesirably be deposited. The ceramic material does not react with either the surface of the superalloy component or the gaseous vapors of the coating composition. At the conclusion of the coating operation, the ceramic coating applied as a mask can be easily and completely removed from the surface of the substrate by simple mechanical means, which surface is free of any coating from the coating operation.

Abstract translation: 掩模材料和将掩蔽材料施加到部件的预选表面上以将保护掩模材料施加的表面暴露于铝气体的气相的方法，同时将保护性环境涂层施加到部件的其它表面 。 诸如在燃气涡轮发动机的热段中发现的部件通常具有复杂的内部通道。 将陶瓷材料作为掩模施加在预选表面上，同时使元件的剩余表面露出。 组分通常是超合金组分，并且暴露的表面将被涂覆有环境保护涂层。 基于是否需要在表面上涂布来预选表面。 陶瓷材料在这些预选表面上形成连续的，无裂纹的掩模，而不会阻碍内部通道。 形成掩模的陶瓷材料在环境涂料应用的高温下是稳定的。 陶瓷掩模材料必须是连续的且基本无裂纹的，以防止环境涂层材料的腐蚀性气相渗透到组件的表面上，否则其将不希望地沉积。 陶瓷材料不与超合金组分的表面或涂料组合物的气体蒸气反应。 在涂布操作结束时，作为掩模施加的陶瓷涂层可以通过简单的机械装置容易且完全地从基板的表面去除，该表面没有涂层操作的任何涂层。