Materials & Coatings

High-Performance Polyimide Powder Coatings

Applications include bridges, pipes, machinery, exposed metal parts and structures, and automobile components. John F. Kennedy Space Center, Florida Powder coatings are used throughout industry to paint a myriad of metallic objects. This method of coating has gained popularity because of its conservation of materials and elimination of volatile organic compounds (VOCs). Resins used in powder coatings are traditionally chosen from those that have low melting points (polyesters, acrylics, urethanes, epoxies, etc.). These resins are used because they can melt and flow into a smooth coating before curing to a durable surface. High-performance resins such as Teflon, nylon, and polyimide have not found use in powder coatings because of their high melting points.

Posted in: Articles, Briefs, Coatings & Adhesives

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Selective Functionalization of Carbon Nanotubes

Lyndon B. Johnson Space Center, Houston, Texas This invention is a process by which carbon nanotubes can be chemically functionalized according to their precise electronic structure. The process involves an exploitation of charge transfer stability at the nanotube sidewall to direct selective reaction of certain electronic structures over others. This process forms the basis for manipulating and separating carbon nanotubes by their electronic structure by chemical means.

Posted in: Articles, Briefs

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Predictive Modeling of Corrosion Efficiencies and Toxicities

An analytical approach using a combination of descriptors successfully predicts the performance of a wide range of organic corrosion inhibitors. John F. Kennedy Space Center, Florida Atmospheric corrosion is significantly accelerated by the presence of heat, humidity, corrosive salts, and sunlight. At Kennedy Space Center (KSC), all of these accelerants are present, producing an extremely corrosive environment. Toxicity and environmental impacts of some inorganic corrosion inhibitors have severely limited the use of some of the most effective corrosion inhibitors. Unfortunately, robust, low-toxicity, high-performance organic corrosion inhibitors for coatings are not yet at a stage to replace the most effective inorganic inhibitors.

Posted in: Articles, Briefs, TSP

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Improving Foreign Object Damage Performance for 2D Woven Ceramic Matrix Composites

A model simulates high-speed impact response of ceramic matrix composites. John H. Glenn Research Center, Cleveland, Ohio As the power density of advanced engines increases, the need for new materials that are capable of high operating temperatures, such as ceramic matrix composites (CMCs), is critical for turbine hot-section static and rotating components. Such advanced materials can significantly increase engine operating temperatures relative to those with conventional superalloy metallic blades. They also show the potential to enable longer life, growth margin, reduced emissions, reduced weight, and increased performance when compared with superalloy blade materials.

Posted in: Articles, Briefs, TSP, Composites

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Low Viscosity, Two Component Epoxy

Master Bond EP112LS is a two-part epoxy that is well suited for impregnation, potting, encapsulation, sealing and coating applications, particularly in the aerospace and optoelectronics industries. EP112LS is optically clear, features reliable non-yellowing properties and has a refractive index of 1.55. This electrically insulative system is resistant to chemicals including water, oils, fuels, acids and bases. EP112LS is serviceable over the temperature range of -60°F to +450°F.

Posted in: Products, Products, Coatings & Adhesives, Photonics

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Laser Optics Coatings

Coated laser optics are used to optimize the characteristics of the emitted laser beam. However, losses are produced at each glass surface - thus the number of optics should be reduced to a minimum. Laser Components (Hudson, NH) offers laser optics that have complex coatings on both the front and the back. From a technical standpoint, this was almost impossible to achieve for a long time because the coating process on the second side heated the first coating and often caused it to crack. The more complex the coating, the more pronounced the problem was.

Posted in: Products, Products, Coatings & Adhesives, Lasers & Laser Systems, Optics, Photonics

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Foldable Material Can Support Many Times its Weight

Researchers at Drexel University and Dalian University of Technology in China have chemically engineered a new, electrically conductive nanomaterial that is flexible enough to fold, but strong enough to support many times its own weight. They believe it can be used to improve electrical energy storage, water filtration, and radio frequency shielding in technology from portable electronics to coaxial cables.

Posted in: News, Energy Storage

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