Dual-pulse quick nitriding method and device based on induction heating

An induction heating, double-pulse technology, applied in the field of metal rapid nitriding surface strengthening, to achieve the effect of easy automatic control, high speed and high heating efficiency

Pending Publication Date: 2017-06-20
GUIZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a simple, convenient, stable quality, low cost, short cycle double-pulse rapid nitriding me...

Method used

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  • Dual-pulse quick nitriding method and device based on induction heating
  • Dual-pulse quick nitriding method and device based on induction heating
  • Dual-pulse quick nitriding method and device based on induction heating

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Carry out pre-treatment of 38CrMoAl nitriding steel samples (sample arrangement, cleaning and activation, etc.), put the pretreated samples into a quartz vacuum tube, seal the quartz vacuum tube, check for leaks, and introduce high-purity argon The air is driven to remove the air in the vacuum tube, and then the vacuum tube is evacuated. When the vacuum requirement is met, the high-frequency machine is turned on to heat the sample in the vacuum tube, and the set temperature fluctuates between 540°C and 570°C. Introduce -30 kPa high-purity ammonia gas into the quartz vacuum tube, keep it warm for 10 minutes, and then vacuumize it for 5 minutes. After repeating the intermittent cycle pumping / gas nitriding treatment for 1 hour, stop the high-frequency machine and keep the temperature Vacuumize the quartz vacuum tube to prevent oxidation of the sample surface, cool the nitriding steel sample in the quartz vacuum tube to below 300°C, take out the nitriding steel sample for re...

Embodiment 2

[0035] Carry out pre-treatment of 38CrMoAl nitriding steel samples (sample arrangement, cleaning and activation, etc.), put the pretreated samples into a quartz vacuum tube, seal the quartz vacuum tube, check for leaks, and introduce high-purity argon The air is driven to remove the air in the vacuum tube, and then the vacuum tube is evacuated. After reaching the vacuum requirement, the high frequency machine is turned on to inductively heat the 38CrMoAl nitrided steel sample in the vacuum tube. After the nitriding steel sample was heated to the set temperature of 560 °C, high-purity ammonia gas of -45 kPa was passed into the quartz vacuum tube, kept for 10 minutes, then vacuumed and kept for 5 minutes, and intermittent periodic pumping / gas infiltration was repeated. After nitrogen treatment for 1 h, stop the high-frequency machine, keep vacuuming the quartz vacuum tube to prevent oxidation on the surface of the sample, cool the nitriding steel sample in the quartz vacuum tube ...

Embodiment 3

[0038] Carry out pre-treatment of 38CrMoAl nitriding steel samples (sample arrangement, cleaning and activation, etc.), put the pretreated samples into a quartz vacuum tube, seal the quartz vacuum tube, check for leaks, and introduce high-purity argon The air is driven to remove the air in the vacuum tube, and then the vacuum tube is evacuated. When the vacuum requirement is met, the high-frequency machine is turned on to heat the sample in the vacuum tube. -60 kPa high-purity ammonia gas, keep it warm for 10 minutes, then vacuumize it for 5 minutes, repeat intermittent periodic pumping / gas nitriding treatment for 1 hour, stop the high-frequency machine, and keep vacuuming the quartz vacuum tube to prevent The surface of the sample is oxidized, and the nitriding steel sample in the quartz vacuum tube is cooled to below 300°C, and the nitriding steel sample is taken out for related testing to complete the entire double-pulse rapid nitriding process.

[0039] Figure 4 It is th...

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Abstract

The invention discloses a dual-pulse quick nitriding method and device based on induction heating. A workpiece in a vacuum tube is subjected to quick heating and nitriding through a high-frequency power supply; the surface temperature of the workpiece and the pressure of nitriding gas in the vacuum tube are monitored through an infrared temperature detector and a pressure sensor; and a control system is used for controlling the workpiece to make pulse cycle within the set temperature range or be stabilized at the set temperature through a temperature signal, and controlling the pressure in the tube to present rectangular pulse change through a pressure signal. The dual-pulse quick nitriding method and device based on induction heating have the advantages that temperature pulses improve the vibration frequency and amplitude of surface atoms, pressure pulses improve the quantity of active nitrogen atoms in media, nitriding of nitrogen atoms is accelerated finally on the condition of dual pulses, and quick nitriding of metal is achieved.

Description

technical field [0001] The invention relates to a double-pulse rapid nitriding method and device based on induction heating, belonging to the technical field of metal rapid nitriding surface strengthening. Background technique [0002] Structural materials such as low-carbon steel, low-alloy steel, stainless steel, and titanium alloy all have disadvantages such as low hardness and poor wear resistance to varying degrees. In order to expand the application range of these metals and improve their surface properties, they are often treated with nitriding strengthening. At present, the common nitriding methods include gas nitriding, ion nitriding, plasma nitriding, laser gas nitriding, etc. However, these nitriding technologies also have problems such as long time, easy oxidation of the workpiece, complicated operation, expensive experimental equipment, thin infiltrated layer, high surface roughness, poor uniformity, many structural defects, low bonding strength, and difficulty...

Claims

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Application Information

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IPC IPC(8): C23C8/24C23C8/26
CPCC23C8/24C23C8/26
Inventor 刘静郑纪豹冯志国杨峰李坤茂张纯
Owner GUIZHOU NORMAL UNIVERSITY
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