Pressurized high-temperature nitriding device with dual-pressure balance structure

Abstract

The invention discloses a pressurized high-temperature nitriding device with a dual-pressure balance structure, and relates to a steel surface chemical heat treatment device. The device comprises a boiler furnace, a furnace shell, an inflation / deflation system, a vacuum-pumping system, a circulating water system, a flow monitoring system, a pressure monitoring device, an exhaust gas collection system and a temperature measurement device. A furnace cover of the device is provided with an inflating pipe which is connected with an NH3 bottle and an N2 bottle; N2 or NH3 in the NH3 bottle and the N2 bottle or N2 and NH3 can be simultaneously introduced into a reaction chamber of the boiler furnace, the lower end of the furnace shell is provided with an inflating pipe which is connected with an Ar bottle and the furnace shell is filled with argon during working. The device lowers the pressure-resisting requirement on the material of the boiler furnace, further reduces the probability of high temperature creep in the boiler furnace, prolongs the whole service life of a nitriding furnace, and can realize high-temperature single-stage or multi-stage nitriding by taking N2, NH3, N2+NH3 and NH3+H2 as media on a steel surface at the pressure of 0.01 to 2.0 MPa and the temperature condition of 20 to 1200 DEG C.

Description

technical field [0001] The invention relates to a steel surface chemical heat treatment device, in particular to a pressurized high-temperature nitriding device. Background technique [0002] At present, most nitriding devices can only realize the nitriding of parts under normal pressure and relatively low temperature conditions, which usually takes a long time, and the nitriding efficiency is low and wastes resources. The nitrogen potential can be increased and the nitriding rate can be accelerated by using the pressurized nitriding method, but increasing the pressure has strict requirements on the furnace material. Nitriding in a high-temperature pressurized environment can easily cause creep of the furnace material, resulting in deformation or even cracking of the furnace, thereby greatly reducing the overall life of the nitriding device, affecting the nitriding quality and even causing danger. Although some special materials can be used to prepare nitriding devices to a...

AI Technical Summary

Problems solved by technology

Nitriding in a high-temperature pressurized environment can easily cause the creep of the furnace material, resulting in deformation or even cracking of the furnace, thereby greatly reducing the overall life of the nitriding device, affecting the nitriding quality and even causing danger

Although some special materials can be used to prepare nitriding devices to achieve pressurized nitriding, it will inevitably lead to an increase in equipment costs, and cannot fundamentally avoid the high temperature creep of the furnace and the accelerated loss of equipment

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