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Method for nitriding gas in high-speed steel blade of air condition compressor

A technology of air-conditioning compressor and treatment method, applied in coating, metal material coating process, solid-state diffusion coating, etc., can solve the problems of high rejection rate, high brittleness of infiltrating layer, difficult processing, etc. Brittleness reduction effect

Active Publication Date: 2010-12-01
XINAN TOOLS GUIZHOU PROV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The alloy elements in high-speed steel have a strong affinity with nitrogen atoms. When the conventional gas nitriding method (ammonia + absolute ethanol) is used to nitride high-speed steel devices, due to improper cont

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0011] Example 1:

[0012] 1. Degreasing: Use 180# gasoline to remove the oil film on the surface of the high-speed steel blade, and wipe the blade clean in the order of two planes→two sides→notch surface→R surface;

[0013] 2. Nitriding: Put the degreased high-speed steel blade into a special fixture, put it in a nitriding furnace, and pour in the infiltrating agent. The composition of the infiltrating agent is calculated as ammonia 360L / h, nitrogen 600L / h, carbon dioxide 40L based on the flow rate. / h, 80 drops / min of anhydrous ethanol, heated to 530°C, kept at this temperature for 3.5 hours and then released;

[0014] 3. Cooling: the blades are air-cooled after being baked;

[0015] 4. The air-cooled leaves can be soaked in oil.

[0016] After this treatment, the mesh structure of the high-speed steel blade is less than or equal to grade 2, the brittleness is obviously reduced, the thickness of the infiltrated layer is more than 50 microns, and the appearance of the blade...

Example Embodiment

[0017] Example 2:

[0018] 1. Degreasing: Use 180# gasoline to remove the oil film on the surface of the high-speed steel blades of the air-conditioning compressor, and wipe the blades clean;

[0019] 2. Nitriding: put the degreased blade in a nitriding furnace, and pour in the infiltrating agent. The composition of the infiltrating agent is calculated as ammonia 480L / h, nitrogen 400L / h, carbon dioxide 60L / h, and anhydrous ethanol 100. drops / min, heated to 560°C, kept at this temperature for 2.5 hours and then released;

[0020] 3. Cooling: the blades are air-cooled after being baked;

[0021] 4. The air-cooled leaves can be soaked in oil.

Example Embodiment

[0022] Example 3:

[0023] 1. Degreasing: Use 180# gasoline to remove the oil film on the surface of the high-speed steel blades of the air-conditioning compressor, and wipe the blades clean;

[0024] 2. Nitriding: Put the degreased blade in a nitriding furnace and pass it into a nitriding atmosphere. The composition of the nitriding atmosphere is calculated as ammonia 300L / h, nitrogen 800L / h, carbon dioxide 60L / h, anhydrous Ethanol 110 drops / min, heated to 510 ° C, kept at this temperature for 4.5 hours and then released;

[0025] 3. Cooling: the blades are air-cooled after being baked;

[0026] 4. The air-cooled leaves can be soaked in oil.

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Abstract

The invention provides a method for nitriding gas in a high-speed steel blade of an air condition compressor. The method comprises the degreasing, nitriding and cooling of the high-speed steel blade, wherein when the high-speed steel blade is nitrided, a penetration nitride agent comprises 300 to 600L/h of ammonia, 400 to 800L/h of nitrogen, 30 to 60L/h of carbon dioxide and 80 to 110 drops/minute of absolute ethyl alcohol based on flow rate. Compared with the prior art, the ammonia and the carbon dioxide are added into the penetration agent to effectively control the nitrogen potential of atmosphere and the nitrogen concentration of the surface of a workpiece in a nitriding furnace, so that after the high-speed steel blade is subjected to gas soft nitriding, a net structure is less than or equal to 2 levels, the brittleness is reduced obviously, the thickness of a nitriding layer is over 50 micrometers, the surface of the nitrided blade does not have any ripples, and the rejection ratio of subsequent processing is reduced obviously.

Description

technical field [0001] The invention relates to the technical field of steel nitriding treatment, in particular to a gas nitriding treatment method for high-speed steel blades of air-conditioning compressors. Background technique [0002] High-speed steel is also known as wind steel or front steel, which means that it can be hardened even when it is cooled in air during quenching, and it is very sharp. It is an alloy steel with complex composition, containing carbide-forming elements such as tungsten, molybdenum, chromium, vanadium, etc., and the total amount of alloy elements is about 10-25%, which can be used to manufacture air-conditioning compressor blades. In order to improve the wear resistance, anti-occlusion performance and noise reduction function of high-speed steel air-conditioning compressor blades (material W6Mo5Cr4V2), it is required that the mesh layer of the compressor blade is less than or equal to 2, and the nitriding layer is greater than 0.050mm. nitroge...

Claims

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Application Information

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IPC IPC(8): C23C8/26
Inventor 彭德银梁益龙唐登炜雷旻
Owner XINAN TOOLS GUIZHOU PROV
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