Ceramic coating shields generator bearing

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Excerpt: In an electric environment, electrolytic corrosion from stray currents threatens bearing performance. NTN’s coated angular contact ball and cylindrical roller bearings, the MEGAOHM Series, insulate the bearings from electric current. A special ceramic coating applied to the outer surface and side …

Waterproof switch covers for circuit breakers

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Excerpt: Waterproof switch covers for circuit breaker panel enclosures are made from silicone transparent rubber per MIL-STD ZZR 765. A molded design keeps out dirt and moisture. The breaker covers can be placed over the circuit breaker and bonded to the panel, or applied behind the panel and shaped to f …

A better way to infusion mold blades

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Excerpt: Infusion molding is one way to make large composite structures such as turbine blades. Briefly, fiber plies and other materials are laid in a mold, covered and sealed with a flexible film, subjected to a vacuum, and infused with catalyzed resin. The method allows pulling air-free resi …

A super seal for temperature extremes

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Excerpt: Isolast J9876, a recent perfluoroelastomer, provides the most comprehensive media resistance at elevated temperatures of any perfluoroelastomer on the market, according to its developer. Seals in this material, from Trelleborg Sealing Solutions, extend their life in aggressive, high-temperature …

Many seals for turbine tasks

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Excerpt: There is a lot of sealing work in a nacelle. Hydraulic equipment, of course, needs them along with areas such as where blades meet hubs. These must all be weather tight yet allow rotation. Simrit Americas, Plymouth, Mich., manufacturers several designs in a range of materials for these applications. …