New gas nitriding technique using the interior of the nitrided pressure vessel as the process chamber

W2329756443 · 수집 2026-10-04 18:12:24

T10377 Metal and Thin Film Mechanics

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The need to nitride the interior of large machine housings, which are also&#13;\npressure vessels, for use in a high-temperature gas reactor resulted in the&#13;\ndevelopment of a suitable new nitriding technique whereby the vessel&#13;\ninterior is used as a process chamber while being heated in a conventional&#13;\ntop-hat heat treatment furnace. However, this new concept introduced&#13;\nseveral mechanical design challenges, such as an extended-length fan&#13;\nshaft, a high-temperature bearing, and sealing flanges for operation under&#13;\nextremely high temperatures. A prototype nitriding plant was constructed&#13;\nand operated to verify the design. The different tunnels machined inside&#13;\nthe forged vessel were nitrided evenly by measuring and balancing the gas&#13;\nflow through each tunnel.&#13;\nTest specimens placed at different positions in the housing were also&#13;\nnitrided during the process. The nitrided specimens were subjected to&#13;\nmicrohardness and layer thickness tests. Measured gas flow rates and&#13;\nother operational data confirmed the inverse proportionality between&#13;\nammonia supply flow rate and measured crack ratio, as well as a crack&#13;\nratio temperature dependence, typical of conventional gas nitriding&#13;\nprocesses.&#13;\nThe design and operation of the nitriding plant were successful and a&#13;\nnitride layer thickness of 400 μηι and a hardness of approximately 1100&#13;\nVHN were achieved. This proves that a large pressure vessel can be&#13;\nsuccessfully nitrided using the vessel’s interior as a process chamber

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