Her Majesty the Queen in Right of Canada As Represented by the Minister of Natural Resources

Raul Santos

Jason Sin Hin Lo

Areekattuthazhayil K Kuriakose

Jason S H Lo

Youliang He

Jacob Krueszewski

An apparatus protected by corrosion resistance coating, said apparatus comprises an enclosure and heat exchanging elements contained therein wherein the heat exchange element and the enclosure are coated with fluoropolymer composites filled with thermally conductive and thermally insulating fillers, respectively. The composites contain: i) at least one fluoropolymer, and in a preferred embodiment the fluoropolymer is perfluoroalkoxy (PFA), and ii) at least one thermally conductive or insulating filler, and in a preferred embodiment the thermally conductive filler is graphite and the thermally insulating filler is carbon black. The thermally conductive filler is added to the coating for heat exchange elements, e.g. tubes, plates, fins, etc., to enhance heat transfer, while the thermally insulating filler is added to the coating for enclosures, e.g. shell, tube sheets, etc., to reduce the heat transfer to the environment.

Method and composite for preparing heat exchangers for corrosive environments

The present invention discloses the fabrication of polymer-coated, coated fiber composites, hybrid composites and a method and apparatus for fabricating the same. The invention provides for the maximum spraying and coating of a roving of coated fibers with molten polymer streams without making physical contact with a solid media, thus simultaneously preventing the fiber surface from getting damaged and stripping off the coating. When metal-coated fiber is used the invention improves the electromagnetic shielding properties of any subsequent product made from the inventive composite. The method and apparatus of the present invention uses sets of nozzle-type sprayers having multiple orifices to enable the thermoplastic or thermoset polymer to penetrate more efficiently into the fiber bundle, thereby providing a more uniform coverage of all fibers. The hybrid composites can consist of two or more types of reinforcements and one or more type of matrix polymer.

Method and apparatus for fabrication of polymer-coated fibers

A preform for use in a metal matrix composite, particularly for a magnesium metal composite. In the preform the reinforcing material typically is silicon carbide, boron nitride, titanium nitride, carbon or graphite. The binder used in the preform is sintered magnesium fluoride, which avoids the known problems which result from the high reactivity of molten magnesium metal with other binders, such as silica and alumina, which results in the formation of magnesium oxide in the reinforced composite. The presence of magnesium oxide crystals in the metal matrix adversely affects the properties of the composite. The preform generally has a void volume of from about 50% to about 95%.

Reinforcement preform for metal matrix composites

A preform for use in a metal matrix composite, particularly for a magnesium metal composite, and a metal matrix composite, typically made by squeeze casting, using the preform. In the preform the reinforcing material typically is silicon carbide, boron nitride, carbon or graphite. The binder used in the preform is magnesium fluoride, which avoids the known problems which result from the high reactivity of magnesium metal with other binders, such as silica and alumina, which results in the formation of magnesium oxide in the reinforced composite. The presence of magnesium oxide crystals in the metal matrix adversely affects the properties of the composite.

Reinforcement preform and metal matrix composites including the reinforcement preform

A process for preparing a preform for use in a metal matrix composite, particularly for a magnesium metal composite, and a metal matrix composite, typically made by squeeze casting, using the preform. In the preform the reinforcing material typically is silicon carbide, boron nitride, carbon or graphite. The binder used in the preform is magnesium fluoride, which avoids the known problems which result from the high reactivity of magnesium metal with other binders, such as silica and alumina, which results in the formation of magnesium oxide in the reinforced composite. The presence of magnesium oxide crystals in the metal matrix adversely affects the properties of the composite.

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Ottawa, Canada

Raul Santos