Reflective and resistant coatings and methods for applying to composite structures
A covering layer and coating technology, applied in the directions of sputtering, coating, transportation and packaging, can solve the problems of the influence of the characteristics of the underlying substrate, the inability to coat the reflective covering layer, and the inability to use it.
Inactive Publication Date: 2006-10-04
GENERAL ELECTRIC CO
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Problems solved by technology
Although metallic reflective coatings are applied to relatively flat composite objects using low temperature techniques such as evaporation or sputtering, such techniques cannot be used where the coated composite device is subjected to temperatures above 150C°
Additionally, reflective overlays cannot be applied to composite surfaces with small radii of curvature
[0006] Other drawbacks of known overlays for composite articles are that their coating process is expensive and has a significant impact on the properties of the underlying substrate deposited thereon
In addition, due to the limitation of the coating equipment, it is difficult to evenly coat the known covering layer on the device with a large curvature
Method used
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[0018] The device onto which the coating of the present invention is spray coated comprises a composite composition, preferably a polymeric composite composition such as PMR, BMI, AFR700, polysulfone and any other polymeric composite composition capable of withstanding operating temperatures of at least 600F. Preferred examples of polymeric composite components onto which reflective coatings may be coated include, but are not limited to, exhaust nozzles, afterburners, combustors, and other components in the flow path of a steam turbine engine that are subject to significant thermal radiation.
[0019] The reflective coating composition of the present invention preferably comprises aluminum, beryllium, gold, silver, rhodium or alloys containing one or more of these metals. After coating is complete, the resulting reflective cover layer is a reflective conductive film having a reflectance greater than 0.9 and a surface resistance equal to greater than about 1 ohm per square inch....
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Abstract
Coated composite articles and methods of applying the coatings are provided. The composite articles (64) are preferably polymeric composites capable of withstanding temperatures of at least 600 degrees Fahrenheit prior to coating. The coating (60) can be selected to impart resistance to higher temperatures as a result of the reflective properties of the coating (60). Additionally, the coating (60) may be selected to provide desired electrical properties when an electrical current is applied. For example, electrically resistant coatings (60) can impart deicing properties to the component, and may be particularly useful in aircraft components (64). The coatings (60) can thus be selected to impart one or more useful properties to the composite component (64).
Description
technical field [0001] This invention relates to composite coatings and in particular to an economical and efficient method of applying thin coatings of metal such as aluminum to composite components such as those used in aircraft. The covering layer imparts useful properties to the composite device such as reflecting away radiant heat and using the resistive properties of the covering layer to heat the surface. Background technique [0002] Steam turbine engines are operating at increasingly hotter temperatures because higher temperatures increase thermal efficiency. The increase in engine operating temperature is limited by the materials used in the engine. Various techniques are used to increase the operating temperature of the metals used, especially superalloys and titanium. [0003] Another trend in aircraft manufacturing is the use of non-metallic composite materials that are lightweight but structurally strong. Although improved composite materials have been devel...
Claims
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IPC IPC(8): C23C30/00C23C14/14C23C16/06C25D3/00
CPCC23C14/06C23C16/20C23C16/30Y02T50/67Y10T428/265Y10T428/31504Y10T428/31721Y02T50/60
Inventor J·F·阿克曼M·P·肖普
Owner GENERAL ELECTRIC CO