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Steel air-ethanol ionic oxynitrocarburizing process

A technology of nitrogen, carbon, oxygen, and ion nitriding, which is applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of glow extinguishing, low surface hardness, non-renewable gasoline, etc., and achieve the simplification of the device Effect

Inactive Publication Date: 2008-03-12
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Its weak point is: 1, utilize air and gasoline as gas source, wherein gasoline is non-renewable energy;
[0004] 2. Gasoline molecules are relatively large, and it is not easy to dissociate into active atoms, resulting in excessive carbon and easily extinguishing the glow;
[0005] 3. The surface hardness of the process is low

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0025] Example 1: Air-ethanol ion nitrocarburizing process of 40Cr steel

[0026] (1) Clean and dry the workpiece after quenching and tempering, and place it on the cathode disc in the ion nitriding furnace;

[0027] (2) Close the furnace body, and use a mechanical pump to evacuate the ion nitriding furnace to 100Pa;

[0028] (3) Turn on the power switch, input an adjustable DC voltage of 900V to the cathode and anode to break up the arc in the furnace, and then adjust the DC voltage until the arc is not broken up;

[0029] (4) Into the ion nitriding furnace, air and ethanol volatile gas with a flow ratio of 25:3 are simultaneously introduced, and the workpiece is heated to 480°C at a heating rate of 100°C / hour;

[0030] (5) After 5 hours of heat preservation at 680V, ​​turn off the gas source and power supply, and cool down to 100°C with the cooling rate of 100°C / hour to stop the furnace. After the workpiece is cooled to room temperature, turn on the furnace and take out the...

Embodiment 2

[0031] Embodiment 2: Air-ethanol ion nitrogen carbon oxygen co-infiltration process of 40Cr steel

[0032] (1) (2) (3) step is identical with embodiment 1 (1) (2) (3) step;

[0033] (4) Air and ethanol volatile gas with a flow ratio of 25:3 are simultaneously introduced into the ion nitriding furnace, and the workpiece is heated to 500°C at a heating rate of 150°C / hour;

[0034] (5) After 5 hours of heat preservation at 640V, turn off the gas source and power supply, and cool down to 100°C with the cooling rate of 100°C / hour to stop the furnace. After the workpiece is cooled to room temperature, turn on the furnace and take out the workpiece.

Embodiment 3

[0035] Embodiment 3: Air-ethanol ion nitrocarburizing process of 40Cr steel

[0036] (1) (2) (3) step is identical with embodiment 1 (1) (2) (3) step;

[0037] (4) Into the ion nitriding furnace, air and ethanol volatile gas with a flow ratio of 25:6 are simultaneously introduced, and the workpiece is heated to 520°C at a heating rate of 120°C / hour;

[0038] (5) After 5 hours of heat preservation at 680V, ​​turn off the gas source and power supply, and cool down to 100°C with the cooling rate of 100°C / hour to stop the furnace. After the workpiece is cooled to room temperature, turn on the furnace and take out the workpiece.

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PUM

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Abstract

The invention provides an air-alcohol ion nitrocarburizing and oxidizing process for steel, which relates to the surface chemical heat treatment process for steel, and is applicable for the surface reinforcing of carbon steels, alloy structural steels and die and tool steels. The invention comprises such procedures as: cleaning, drying and placing a tempered work piece on a cathode disc of an ion nitriding furnace, vacuuming the inside of the ion nitriding furnace, inputting an adjustable DC voltage, inputting air and alcohol in flow proportions and meanwhile heating, keeping temperature, cooling in the furnace, and tapping. The invention uses no ammonia or nitrogen hydrogen, reduces cost, and reduces environmental pollution as well as hidden problem concerning safety due to hi-pressure gas bottle and combustibility and explosivity of hydrogen, and improves the wear resistance and hardness of work pieces.

Description

Technical field: [0001] The invention relates to a surface chemical heat treatment process of steel. Suitable for surface strengthening of carbon steel, alloy structural steel and tool steel. Background technique: [0002] China's invention patent application number is 200510057118.9 "air / gasoline ion multiple co-infiltration process of steel" invention application, the process flow is: (1) clean and dry the quenched and tempered workpiece, put it on the cathode plate, and close the furnace body , Use a mechanical pump to evacuate the ion nitriding furnace to 50-120Pa; (2) Input 10-1000V adjustable DC high voltage to the cathode and anode to break up the arc in the furnace, and then adjust the DC voltage until the scattered arc is scarce. No or less scattered arcs; (3) Air and gasoline mixture are introduced into the nitriding furnace; (4) The workpiece is heated to 500-580°C at a speed of 50-100°C / hour; (5) Heat preservation time is 0.5- After 60 hours, turn off the gas s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/38
Inventor 周上祺刘林飞黄玉堂
Owner CHONGQING UNIV
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