| 摘要 |
<p>The invention provides an engine component comprising a substrate metal and having a composite thermal shield covering a portion of an external surface of said component. The composition shield comprises an external solid metal layer, a first layer of permeable metal bonded thereto, an internal solid metal layer, and a second permeable metal layer. The internal solid metal layer is positioned intermediately of and bonded on its opposed sides to the first and second permeable metal layers, wherein the interstices of said second permeable metal layer are substantially filled with the substrate metal, so that the composite thermal shield is mechanically affixed to the substrate metal of the engine component. The substrate metal extends into the interstices of only the second permeable metal layer, the internal solid metal layer being disposed for preventing substrate metal from entering the first layer of permeable metal during manufacture of the component.</p> |
