The pulse device uses a settable time controller to ensure that the nitriding process is performed automatically. The additive penetrant used in the vacuum pulse nitriding of the exhaust gas purification device is mainly ammonia gas. During the pulsed nitriding process, the residual gas needs to be discharged outside the furnace. The residual ammonia is harmful to the human body. How to overcome the impact on the environment is my own. One of the key points in the development of vacuum pulse nitriding equipment is that I have designed and manufactured an exhaust gas purification device that fully burns the residual gas to the device port. The actual use of this exhaust gas purification device is safe and reliable.

MECHANISM The nitriding process of iron and steel includes the decomposition reaction of the seepage agent (ammonia gas), the interfacial reaction, the diffusion of nitrogen in the steel, and the formation of nitrides during the diffusion process (the formation of alloy nitrides in the nitriding steel). Each process affects the depth of the nitrided layer. The nitriding medium I used was ammonia. In the first step, the process of adsorption of ammonia on the steel surface, because the activation energy of adsorption is generally much lower than the activation energy of chemical reaction, this step is faster, and the higher the temperature, the faster ( In the range of 400°C-600°C). In the second step, the adsorbed ammonia quickly decomposes into [N] atoms. In the third step, the active [N] atoms precipitated on the surface of steel will not be absorbed by the steel surface in time, and they will quickly escape from the gas phase. When the decomposed active nitrogen atoms are absorbed by the steel surface, they dissolve in the A-Fe lattice to form a solid solution, or form r or E nitrides. According to these mechanisms, in my process experiment, consider that ammonia gas can reach the surface of the workpiece as soon as possible to absorb and decompose, so that the decomposed active [N] atoms can be absorbed by the workpiece in time to achieve the purpose of nitriding, and the surface of the workpiece is not Allow oil and rust, otherwise the atom is isolated from the surface of the workpiece, affecting the effect of nitriding.

The nitriding process is not only required to meet the performance requirements, but also to meet the principle of easy quality control, stable and reliable production applications, rapid process, simple equipment, easy operation, low cost, no environmental pollution and so on. According to what I study for tool materials, so the test material used P20, Cr12MoV, 3Cr2W8V, 38CrMoAlA and H13 five kinds of materials. These five kinds of materials belong to the more typical alloy die steels and nitriding steels. The matrix of these steels has a certain hardness after being pretreated by heat, and mainly depends on the formation of coherent alloy nitrides to further improve the hardness and wear resistance. The effect of temperature on the substrate is taken at a temperature of 500-560°C for the process experiment. We have tested the effects of different vacuum pulse nitriding temperatures, different furnace pressures, different nitriding times, and different ammonia flow rates on the ammonia layer. After the workpiece is loaded in the furnace, it is vacuum-preheated for a certain period of time after the furnace is installed. Then, ammonia gas is injected to conduct vacuum pulse nitriding. After the furnace is evacuated, the temperature is lowered to 500°C and then the furnace is cooled.

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