Westinghouse Electric Corporation

David J Boes

Mary Anne Alvin

Alan T Male

Natraj C Iyer

Gene J Zottola

George R Kelecava

Elmer E Eiffler

An annular chromium carbide coating on an annular sealing surface of a stainless steel sealing assembly component for use in a nuclear reactor coolant pump, is treated by encasing at least the chromium carbide coating on the stainless steel sealing surface by applying a metallic cover thereover, evacuating the atmosphere between the cover and the coating on the sealing surface, hot isostatic pressing the stainless steel sealing assembly component and the chromium carbide coating thereon encased by the cover, cooling the sealing assembly component and the coating thereon encased by the cover, and after cooling thereof removing the cover from the coating. The result is a chromium carbide coating on the sealing component substrate densified substantially to its full theoretical density (greater than 99%) and metallurgically bonded by the hot isostatic pressing to the substrate exterior surface.

Method of treating a coating on a reactor coolant pump sealing surface

A pump has a shaft and a housing containing pressurized fluid and employs a rubbing-type sealing assembly for sealably and rotatably mounting the shaft within the housing. The sealing assembly includes an annular runner mounted around the shaft for rotation therewith and an annular seal ring mounted within the housing in non-rotational relationship thereto. The runner and seal ring have surfaces facing and in rubbing contact with one another. A coating of titanium nitride is incorporated on at least one of the surfaces. The coating of titanium nitride can be deposited as an outer hardface layer on the one surface, or, alternately, as an inner passivating barrier layer upon the one surface and then a coating of chromium carbide can be deposited as an outer hardface layer on the coating of titanium nitride.

Reactor coolant pump sealing surfaces with titanium nitride coating

Disclosed is a lubricating grease composition of about 90 to about 99% by weight of a lubricant and about 1 to about 5% by weight of polymeric organometallic phthalocyanine complex, including nitrogen-substituted analogues thereof, where the complexed metal ion is a Group IVA metal. The lubricating composition is used in ball and roller bearings, especially at high speeds and high temperatures.

Phthalocyanine complex-filled greases

A face type shaft seal for liquid metal pumps comprises a non-contacting seal in which at least one seal face has spiral grooves therein. The seal faces are gold plated and designed so that the liquid metal wets the seal faces and creates a thin layer of liquid metal between the two seal faces during both rotation of the pump shaft and non-rotation of the pump shaft. The thin layer of liquid metal prevents contact of the two seal faces during initial rotation of the pump shaft.

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Monroeville, PA, United States of America

David J Boes