Salt bath formula for treating high-speed steel air conditioning compressor blade by salt bath nitriding treatment and treatment method

An air-conditioning compressor, salt bath nitriding technology, applied in coating, metal material coating process, solid-state diffusion coating, etc., can solve the problems of no obvious improvement of high-speed steel infiltration rate, environmental pollution, complicated operation, etc. Achieve the effect of increasing the concentration ratio, not easy to white and bright layer, and good activity

Active Publication Date: 2010-10-27
SHANGHAI JIANGKAI METAL SURFACE TREATMENT TECH +1
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, this method not only complicates the operation, but also causes certain pollution to the environment (ammonia gas

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Potassium cyanate (KCNO) 25%, sodium cyanate (NaCNO) 15%, lithium carbonate (Li 2 CO 3 )5%, sodium carbonate (Na 2 CO 3 )15%, Potassium Carbonate (K 2 CO 3 ) 30%, sodium chloride (NaCl) 10%.

Embodiment 2

[0019] Potassium cyanate (KCNO) 25%, sodium cyanate (NaCNO) 15%, lithium carbonate (Li 2 CO 3 )5%, sodium carbonate (Na 2 CO 3 )15%, Potassium Carbonate (K 2 CO 3 ) 35%, sodium chloride (NaCl) 5%.

[0020] The component of the present invention is mainly made of cyanate and carbonate, and its reaction mechanism is that cyanate reacts with oxygen to generate nitrogen and carbonate, wherein the nitrogen atom penetrates into the matrix, and the cyanate consumed along with the reaction can be It is replenished by adding regeneration salt, which can be recycled.

[0021] CNO - +O 2 →[C]+[N]+CO 3 2-

[0022] CO 3 2- +Z(Regeneration Salt)→CNO -

[0023] The preparation method of the present invention is as follows:

[0024] Put urea, carbonate and other components into the crucible after being fully mixed and melted at a high temperature of 600°C and then kept for 2 hours before mass production can be carried out. Regeneration Salt can be obtained in the same way.

...

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PUM

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Abstract

The invention relates to a salt bath formula for treating a high-speed steel air conditioning compressor blade by salt bath nitriding treatment and a treatment method. The salt bath formula comprises the following compositions in percentage by weight: 15-25 percent of potassium cyanate, 5-20 percent of sodium cyanate, 3-10 percent of lithium carbonate, 8-20 percent of sodium carbonate, 10-40 percent of potassium carbonate and 1-10 percent of sodium chloride. The invention has the advantages that because Li ions and Cl ions are added in the formula, the melting point of salt bath is lowered, and nitridation can be carried out under lower temperature; the activity is favorable, and good appearance and good diffusion layer thickness can be achieved without introducing ammonia; and the K/Na concentration proportion is enhanced, and a white layer is not easy to form on the surface of a workpiece.

Description

technical field [0001] The invention relates to salt-bath nitriding treatment for high-speed steel air-conditioning compressor blades, and in particular to the salt-bath formula and process used in the treatment. Background technique [0002] In order to improve the wear resistance and noise reduction function of high-speed steel air-conditioning compressor blades (material W6Mo5Cr4V2), it is required that there is no white layer on the surface, and the surface hardness is > 1000HV 0.3 , the hardness at 0.03mm from the surface hardness > 860HV 0.3 . The surface nitriding process is usually adopted, and gas nitriding is mostly used at home and abroad. The disadvantage is that the nitriding activity is poor, and it takes a long time for nitriding to meet the requirements, and the gas nitriding process is affected by the air flow, and the flatness of the blade after nitriding It is easy to be out of tolerance, and oil cooling is required to ensure the cleanliness of the...

Claims

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Application Information

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IPC IPC(8): C23C8/50C23C8/02C23C8/80
Inventor 李迪准徐晓翔黄宁彭德银
Owner SHANGHAI JIANGKAI METAL SURFACE TREATMENT TECH
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