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Rare earth catalyzed nitrocarburizing technology

A technology of nitrocarburizing and rare earth, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of small depth of infiltration layer and insufficient utilization of infiltration agent, etc., and achieves smooth hardness gradient and dispersion The effect of increased hardness and increased hardness

Inactive Publication Date: 2013-01-09
TIANJIN SHANGRE METAL TECH
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  • Description
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a rare earth catalyzed nitriding carburizing process in order to overcome the defects of low hardness of the carburized layer, small depth of the carburized layer, and insufficient use of the carburized agent in the traditional nitrocarburizing, which makes the carburized layer The white bright layer is thickened, the penetration layer depth is increased, the penetration rate is increased by 9-14%, the process time is shortened, the production efficiency is improved, and the surface hardness of the workpiece and the hardness of the diffusion layer are improved, the hardness gradient becomes gentle, and the penetration layer structure is refined , increase the dispersion of nitrides, improve the performance and service life of the workpiece

Method used

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  • Rare earth catalyzed nitrocarburizing technology
  • Rare earth catalyzed nitrocarburizing technology
  • Rare earth catalyzed nitrocarburizing technology

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 3Cr2W8, 40Cr and 45 steels were selected as test materials, and the specific sample materials and sizes were 18*5, 25*4, 22*4.1, and the substrates were all in quenched and tempered state.

[0028] Dissolve lanthanum chloride compound in ethanol to prepare rare earth mixed penetrating agent. The maximum solubility of lanthanum chloride in ethanol is about 12 g / L according to the self-solubility test (with no precipitation in the solution after the addition of rare earth substances). The lanthanum chloride addition used was 4 g / L ethanol.

[0029] The equipment used is the JT-60 well-type gas nitrocarburizing furnace of our factory, and the working room size: ?450×600mm.

[0030] In this embodiment, a carburizing agent and a nitriding agent are introduced during the nitrocarburizing process. The carburizing agent is methanol or acetone, and the nitriding agent is ammonia.

[0031] This embodiment is carried out in conjunction with actual production, using the conventi...

Embodiment 2

[0033] Embodiment 2 is the same as embodiment 1, and difference is: the lanthanum chloride addition that adopts is 6 grams / liter ethanol.

Embodiment 3

[0035] Embodiment 3 is the same as embodiment 1, and the difference is: the lanthanum chloride addition that adopts is 8 grams / liter ethanol.

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Abstract

The invention relates to a rare earth catalyzed nitrocarburizing technology, characterized by preparing rare earth catalyst with different concentrations, selecting proper technological parameter s according to workpiece techniques to conduct nitrocarburizing, after completing nitrocarburizing, conducting oil cooling; preferably the rear earth catalysts are prepared by dissolving lanthanum chloride compound in ethanol; and further, the lanthanum chloride concentrations in the rear earth catalysts are respectively 4 g / per liter of ethanol,6 g / per liter of ethanol, and 8g / per liter of ethanol. Compared with the prior art, the technology disclosed herein thickens the white bright layer of the infiltrated layer, increases the infiltrated layer depth, raises the nitrocarburizing speed by 9-14%, shortens the technology time, raises the production efficiency, and raises the surface hardness of the workpiece and the diffusion layer hardness to flatten the hardness gradient, refine the infiltrated layer tissues, raise the dispersivity of nitrides, raise the usability and prolong service life of the workpiece.

Description

technical field [0001] The invention relates to a heat treatment process, in particular to a rare earth catalyzed nitriding and carburizing process. Background technique [0002] Traditional nitrocarburizing has the advantages of low co-infiltration temperature, small deformation, and low brittleness, which can improve the fatigue life and wear resistance of materials, but there are problems such as low hardness of the infiltration layer, small depth of infiltration layer, and poor utilization of infiltration agent. Full and other shortcomings. [0003] In order to apply the advanced rare earth infiltration technology to gas nitrocarburizing production, it is necessary to study the influence of rare earth on the gas nitrocarburizing process performance and mold performance of 3Cr2W8, 40Cr, and 45 steels, and to develop a suitable Rare earth catalyzed nitriding carburizing process. Contents of the invention [0004] The purpose of the present invention is to provide a rar...

Claims

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Application Information

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IPC IPC(8): C23C8/32
Inventor 张宏贵
Owner TIANJIN SHANGRE METAL TECH
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