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Surface hardness reinforced coating and preparation method thereof

A surface hardness and coating technology, applied in coating, metal material coating process, gaseous chemical plating, etc., can solve the problems of complex process, complicated process, long time consumption, etc., and achieve the effect of less impurity pollution and simple process

Active Publication Date: 2018-10-09
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the patent CN201610707678.2, the inventor immersed the titanium carbide electrode in the processing fluid composed of alkyl modified graphite and kerosene, and the energy generated by the pulse discharge melted the titanium carbide, co-deposited with the graphite on the surface of the workpiece to form titanium carbide / Graphite composite coating, the disadvantage of this invention is that the process is complicated and time-consuming. In order to mix graphite and kerosene evenly, graphite needs to be modified by alkyl functionalization first, which makes the process more complicated.

Method used

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  • Surface hardness reinforced coating and preparation method thereof
  • Surface hardness reinforced coating and preparation method thereof
  • Surface hardness reinforced coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Use alcohol and acetone to ultrasonically clean the metal titanium for 3 times, and let it dry naturally;

[0025] 2. Pass metal titanium into the plasma enhanced chemical vapor deposition equipment, and use a mechanical pump to vacuum below 1x10 -1 Pa;

[0026] 3. Introduce 400sccm argon gas, and raise the temperature to 900°C at a rate of 10°C / min;

[0027] 4. Inject 30sccm methane gas, turn off the argon gas, turn on the radio frequency source, set the radio frequency power to 300W, and grow for 0.5h;

[0028] 5. Turn off the radio frequency source, feed 400 sccm argon gas, stop feeding methane gas, cool down to room temperature naturally, and obtain titanium carbide / graphite enhanced coating.

[0029] figure 1 Middle curve 2 is the XRD diffraction curve of the composite coating, and the characteristic peak of TiC is marked in the curve, and curve 1 is the X-ray diffraction curve of the comparison sample without growing composite coating; figure 2 is the Rama...

Embodiment 2

[0031] 1. Use alcohol and acetone to ultrasonically clean the metal titanium for 3 times, and let it dry naturally;

[0032] 2. Pass the titanium alloy into the plasma-enhanced chemical vapor deposition equipment, and use a mechanical pump to evacuate to a vacuum degree lower than 1x10 -1 Pa;

[0033] 3. Introduce 200sccm argon gas, and raise the temperature to 500°C at a rate of 3°C / min;

[0034] 4. Inject 10 sccm methane gas, turn off the argon gas, turn on the radio frequency source, set the radio frequency power to 100W, and grow for 2 hours;

[0035] 5. Turn off the radio frequency source, feed 200 sccm argon gas, stop feeding methane gas, cool down to room temperature naturally, and obtain titanium carbide / graphite enhanced coating.

[0036] The thickness of the titanium carbide layer is 3 μm, and the thickness of the graphite layer is 100 nm. The hardness measured under a load of 10g is 605, and the hardness of the ungrown coating sample is 204. It can be seen that t...

Embodiment 3

[0038] 1. Use alcohol and acetone to ultrasonically clean the metal titanium for 3 times, and let it dry naturally;

[0039] 2. Pass metal titanium into the plasma enhanced chemical vapor deposition equipment, and use a mechanical pump to vacuum below 1x10 -1 Pa;

[0040] 3. Introduce 400sccm argon gas, and raise the temperature to 700°C at a rate of 5°C / min;

[0041] 4. Inject 40sccm methane gas, turn off the argon gas, turn on the radio frequency source, set the radio frequency power to 200W, and grow for 1.5h;

[0042] 5. Turn off the radio frequency source, feed 400 sccm argon gas, stop feeding methane gas, cool down to room temperature naturally, and obtain titanium carbide / graphite enhanced coating.

[0043] The thickness of the titanium carbide layer is 4 μm, and the thickness of the graphite layer is 200 nm. The hardness measured under a load of 10g is 653, and the hardness of the ungrown coating sample is 204. It can be seen that the hardness of the workpiece surfa...

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Abstract

The invention relates to a surface hardness reinforced coating and a preparation method thereof, and the reinforced coating is composed of a titanium carbide layer and a graphite layer. The preparation method comprises the following steps: (1) ultrasonic cleaning metal titanium or titanium alloy and drying in air by utilizing alcohol and acetone; (2) putting the metal titanium or titanium alloy into plasma reinforced chemical vapor deposition equipment, utilizing a mechanical pump to perform vacuum-pumping until vacuum degree is lower than 1*10<-1>Pa; (3) leading in argon gas of 200 sccm-400 sccm, and heating to 500-900 DEG C at a rate being 3 DEG C / min to 10 DEG C / min; (4) leading in methane gas of 10-50 sccm, closing argon gas, opening a radio frequency source, setting radio frequency power to be 100W-300W, and growing for 0.5-2 hours; and (5) closing the radio frequency source, leading in argon gas of 200 sccm-400 sccm, stopping to lead in methane gas, naturally cooling to the roomtemperature, thereby obtaining the titanium carbide / graphite reinforced coating. The proportion of titanium carbide to the graphite is regulated by controlling parameters such as methane gas flow andgrowth time, so that the performance of the coating is modulated.

Description

technical field [0001] The invention belongs to the technical field of surface treatment. Background technique [0002] Titanium carbide (TiC) has many advantages such as high melting point (~3050°C), high Vickers hardness (~30GPa), high wear resistance and excellent high temperature oxidation resistance, and is widely used in cutting tools, molds, and aerospace materials. However, the titanium carbide coating is relatively brittle and easy to collapse during use. There are currently two main solutions to overcome this drawback. The first option is to replace the titanium carbide coating with a titanium nitride carbide (TiCN) coating. Nitrogen atom doping can significantly improve the toughness and abrasive wear resistance of the coating, thereby improving the heat resistance and corrosion resistance of the workpiece; the second option is A composite coating of titanium carbide and graphite is prepared. The composite coating can reduce the friction factor under high contact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/26C23C16/32
CPCC23C16/26C23C16/32
Inventor 周海涛罗炳威刘大博罗飞田野陈冬生
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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