Lanthanum-Nitriding Rare Earth Catalyst

Abstract

The invention provides a lanthanum-nitrogen co-penetration rare earth penetration activator and relates to a chemical heat treatment nitriding activator. The lanthanum-nitrogen co-penetration rare earth penetration activator can be used for overcoming the defects of the previous mixed rare earth penetration activator that utilization rate of rare earth is low, residue amount is high and a penetration activator can be inactivated easily, wherein the previous mixed rare earth penetration activator takes lanthanum cerium rare earth as a main body. The lanthanum-nitrogen co-penetration rare earth penetration activator comprises the following components in percentage by weight: 40-80% of lanthanum chloride, 10-50% of ammonium chloride, 5-30% of dicyandiamide and 5-30% of urea. A rare earth element is lanthanum chloride rare earth as La as main body, wherein lanthanum content is 90-99% (La2O3 / Re2O3), and Ce content is less than 5% (CeO2 / Re2O3). The lanthanum-nitrogen co-penetration rare earth penetration activator can reduce influence to a rare earth penetration activator in an exhausting and heating stage in the initial stage of nitriding, so that volatilization amount of the rare earth element is higher, more activated rare earth atoms are produced, penetration activation efficiency is improved, so that penetration activating effect is stable, and the lanthanum-nitrogen co-penetration rare earth penetration activator has the characteristics that utilization rate of rare earth is high, less rare earth residue is produced, the lanthanum-nitrogen co-penetration rare earth penetration activator is not sensitive to exhausting process time of an initial nitriding stage, the penetration activator can be hardly inactivated and penetration activation effect is improved.

Description

technical field [0001] The invention relates to a chemical heat treatment lanthanum-nitriding rare earth permeation accelerator. Background technique [0002] Nitriding is an important chemical heat treatment process. At present, ammonia gas is often used as the nitriding atmosphere, and gas nitriding is carried out in the temperature range of 500-540°C. Although some ion nitriding or vacuum furnace nitriding processes are used in the nitriding process, the main nitriding process is still pit furnace gas nitriding. [0003] The existing pit furnace gas nitriding process is characterized by relatively simple and durable equipment, simple control means, good adaptability to some special workpiece nitriding, and low operating cost; but there are also problems of high energy consumption and long process time. Disadvantages, the general nitriding speed is about 0.01mm / h, which is an important requirement that many application units urgently need to correct. In addition, for some...

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Problems solved by technology

[0008] The purpose of the present invention is to solve the above-mentioned problems existing in the existing rare earth penetrating agent, and provide a kind of rare earth utilization rate is high, the rare earth residue produced is less, it is not sensitive to the exhaust process time in the early stage of nitriding, and the penetrating agent is not easy to lose efficacy Lanthanum-Nitridation Rare Earth Permeation Catalyst

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