Rapid nitriding process

Abstract

The invention provides a rapid nitriding process, and belongs to the technical field of heat treatment. The rapid nitriding process includes: a step A that an electrolyte is added to an electrolysis container, the electrolysis container is then sealed, an electric heating device is arranged on the side portion of the electrolysis container, and a natural gas heating device is arranged at the bottom of the electrolysis container; a step B that external ammonia gas is sent to a gas outlet pipe through a valve, the whole electrolysis container and a whole nitrogenation oven are filled with the ammonia gas in a circulating mode, and then the valve is closed; a step C that a controller controls the natural gas heating device to heat the electrolyte to the boiling point, and then the controller drives an electrolysis rod to work and conduct electrolysis; a step D that the controller controls the natural gas heating device and the electric heating device to conduct alternative heating so that the concentration of nitrogen atoms can be increased; and a step E that an air blower is started so that the ammonia gas and the generated nitrogen atoms can be mixed in water vapor and unceasingly sent to the nitrogenation oven, and closed type circulation is achieved through cooperation of the gas outlet pipe and a gas inlet pipe. Thus, the nitrogen atoms in the nitrogenation oven can be unceasingly supplemented, the nitridation time can be shortened by half, and the defect that the cost is high due to the fact that ammonia gas is unceasingly conveyed in the conventional process is overcome.

Description

technical field [0001] The invention relates to a rapid nitriding process and belongs to the technical field of heat treatment. Background technique [0002] Nitriding is a chemical heat treatment process that infiltrates nitrogen atoms into the surface of the workpiece in a certain medium at a certain temperature. Common liquid nitriding, gas nitriding, ion nitriding. The traditional gas nitriding is to put the workpiece in a sealed container, pass it through the flowing ammonia gas and heat it. After a long time of heat preservation, the ammonia gas thermally decomposes to generate active nitrogen atoms, which are continuously adsorbed to the surface of the workpiece and diffuse into the surface layer of the workpiece. , thereby changing the chemical composition and organization of the surface, and obtaining excellent surface properties. However, the nitriding time is relatively long, and it takes 80 hours to achieve a good nitriding effect, resulting in low nitriding ef...

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Problems solved by technology

[0004] The problem to be solved by the present invention is that the existing nitriding efficiency is low

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