Thrust bearing nitriding system and process for iron-based powder metallurgy

Abstract

The invention relates to a nitriding process for iron-based powder metallurgy, in particular to a thrust bearing nitriding system and process for iron-based powder metallurgy. By the thrust bearing nitriding system and process for iron-based powder metallurgy, safe discharge is implemented, energy consumption is low, and the nitriding efficiency is high. The thrust bearing nitriding system comprises a liquid ammonia tank (1), a pressure reducing valve (2), a glass rotor flowmeter (3), a heat treatment resistance furnace (4), a first valve (5), a second valve (6), an ammonia decomposition furnace (7), a first ignition opening (8) and a second ignition opening (9), wherein the liquid ammonia tank (1) communicates with the heat treatment resistance furnace (4) through the pressure reducing valve (2); the glass rotor flowmeter (3) is serially connected between the pressure reducing valve (2) and the heat treatment resistance furnace (4); the first valve (5) and the second valve (6) are arranged on the heat treatment resistance furnace (4); the first ignition opening (8) is formed in the first valve (5); the second valve (6) communicates with the ammonia decomposition furnace (7); and the second ignition opening (9) is formed in the ammonia decomposition furnace (7).

Description

technical field [0001] The invention relates to an iron-based powder nitriding process, in particular to an iron-based powder metallurgy thrust bearing nitriding system and its process. 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. The nitriding of the prior art is to put the workpiece into a sealed container, pass through 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 of the workpiece. Thereby changing the chemical composition and organization of the surface to obtain a suitable surface hardness. [0003] With the increasing use of turbochargers, the types and requirements of thrust bearings for turbochargers are increasing, and the requirements for wea...

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Problems solved by technology

[0003] With the increasing use of turbochargers, the types and requirements of thrust bearings for turbochargers are increasing, and the requirements for wear resistance and strength of thrust bearings are also increasing, but the hardness of powder metallurgy products itself Relatively low, how to improve the hardness of iron-based powder metallurgy thrust bearings to improve wear resistance and strength performance, nitriding process is an effective method, but there is currently no special method for iron-based powder metallurgy thrust bearings Nitriding treatment process, and to ensure safe discharge, environmental protection and energy saving as much as possible is also an extremely important issue in the current nitriding process

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