Nitridation salt for metal surface heat-treatment

A technology of metal surface and nitride salt, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of unsatisfactory treatment effect, high cost and long treatment time

Inactive Publication Date: 2008-03-12
孙国飞
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AI Technical Summary

Problems solved by technology

However, due to the defects in formula design of existing metal surface heat treatment nitride salts, ther

Method used

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Example Embodiment

[0006] In the following, the present invention will be further described by comparing the prior art gas nitriding process and the salt bath nitriding process using the nitriding salt of the present invention.

[0007] Prior art gas nitriding process:

[0008] 1. Cleaning: clean dirt and oil stains on the surface of parts;

[0009] 2. Clamping: select the corresponding fixture according to the size and shape of the part;

[0010] 3. Into the furnace nitriding: According to the requirements of the parts, select the corresponding temperature and time for nitriding;

[0011] 4. Oil cooling: After nitriding, use oil for cooling.

[0012] The main shortcomings are: long time deformation and unstable deformation of the large permeability layer.

[0013] The salt bath nitriding process using the nitriding salt of the present invention:

[0014] 1. Clamping: Choose the corresponding clamp according to the size and shape of the part;

[0015] 2. Degreasing: remove the oil stains on the surf...

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Abstract

The invention provides a nitrating salt for surface heat treatment of metals, which pertains to the technical field of surface heat treatment for metals, comprises urea, potassium chloride or barium chloride, sodium carbonate and K2S, etc., and is characterized in that the components by weight are: urea 30-40%, potassium chloride or barium chloride 20-28%, sodium carbonate 38-44%, and K2S 0.0001-0.1%. The total weight percent of components is 100%. In respect to the problems of prior nitrating salt for surface heat treatment of metals, the invention sieves reasonably and compares the components of prior nitrating salt; by a plurality of repeated studies and experiments, the invention designs a reasonable formula. Comparing with prior technology, the invention can solve the surface heat treatment for ferrous metals, the deformation in metallic products is very small after treatment, and is 1/2 of that from ordinary nitration by salt bath; the invention is of such advantages as the low deformation, the short time and the high efficiency, and can substantially reduce the cost.

Description

technical field [0001] The invention relates to a nitride salt for metal surface heat treatment, which belongs to the technical field of metal surface heat treatment. technical background [0002] With the rapid development of the heat treatment industry in recent years, various performance indicators after heat treatment have become the key points for testing the effect of heat treatment. For metal surface heat treatment, high surface hardness, thick penetration layer, short treatment time and high efficiency are the prerequisites and basic conditions for testing surface heat treatment. Salt bath nitriding is a form of surface heat treatment of metal products by melting solid salt into liquid in a salt bath furnace. The products processed by it have the advantages of high surface hardness and small deformation, and have begun to be recognized and affirmed by the heat treatment industry, and have been rapidly promoted. However, the existing nitride salts for metal surface ...

Claims

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Application Information

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IPC IPC(8): C23C8/48
Inventor 孙国飞王文贵
Owner 孙国飞
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