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1. were studied by using vacuum resistance furnace high temperature nitriding, X-ray diffraction analysis and other experimental test methods. Industrial gaseous nitrogen, as the main gas phase component of nitriding gas, can simultaneously nitridate and oxidize ferromanganese to generate Mn4N and MnO compounds; with the increase of nitriding temperature, the content of manganese oxides increases accordingly. Adding ammonia to the nitriding atmosphere reduces the partial pressure of nitrogen, the equilibrium adsorption concentration, and the nitrogen content of the nitrided sample.

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