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Method for laser preparation of titanium nitride gradient coating on surface of titanium and titanium alloy

A gradient coating, titanium alloy technology, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of coarse nitride layer grain, large surface roughness, easy deformation of the substrate, etc. Low coefficient of friction, low surface roughness, and improved pitting resistance

Inactive Publication Date: 2014-05-14
山东万丰煤化工设备制造有限公司 +1
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Problems solved by technology

[0009] The present invention adopts the composite process of preheating, adding modificator, ultrasonic vibration and laser scanning, which solves the disadvantages of easy cracks, large surface roughness, easy deformation of the substrate and coarse grains of the nitrided layer in traditional laser gas nitriding, and improves Improve the hardness of titanium and titanium alloys, improve their wear and corrosion resistance

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  • Method for laser preparation of titanium nitride gradient coating on surface of titanium and titanium alloy
  • Method for laser preparation of titanium nitride gradient coating on surface of titanium and titanium alloy
  • Method for laser preparation of titanium nitride gradient coating on surface of titanium and titanium alloy

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Embodiment Construction

[0033] Laser treatment of 4mm thick TA2 thin plate, the specific steps are as follows:

[0034] 1. First, polish the surface of the titanium alloy substrate, and scrub with acetone to remove oil;

[0035] 2. Spray 0.03-0.1mm thick SiO with aluminum and vanadium powder added as modifier on the cleaned substrate 2 light-absorbing paint;

[0036] 3. Preheat the blackened substrate to 100-300°C;

[0037] 4. Put the preheated matrix in a semi-airtight container filled with reaction gas, perform laser scanning treatment, and perform ultrasonic vibration treatment at the same time. The specific implementation steps are: put the sample on the semi-airtight stage, The container is placed in the ultrasonic vibration generator, and the reaction gas is passed into the semi-airtight container for a period of time, and the sample is scanned by a high-power laser to directly form a golden yellow titanium nitride gradient coating, the laser is turned off, and then stopped gas input.

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Abstract

The invention provides a method for a laser preparation of a titanium nitride gradient coating on a surface of titanium and titanium alloy. The method comprises the steps of performing surface cleaning treatment, surface blackening treatment and preheating treatment for a workpiece subatrate; and then carrying out laser nitriding treatment. The method is characterized in that the laser nitriding treatment is performed in a condition of filling reaction gas, and simultaneously laser scanning treatment and ultrasonic oscillating treatment for the surface of the workpiece subatrate are carried out. The titanium nitride gradient coating with a thickness of 50-200 [mu]m is obtained on the surface of the titanium and titanium alloy. The titanium nitride gradient coating is mainly composed of a nitride layer and a nitrogen diffusion layer, and has uniform transition of the coating microstructure. The surface hardness, wear resistance and corrosion resistance of the titanium nitride gradient coating are improved significantly than those of the matrix. Also, problems that crack are easy to produce, surface roughness is large, and the crystal grains of dendrite crystals of a nitride layer are coarse, in ordinary laser gas nitriding processes, are solved.

Description

technical field [0001] The invention belongs to the surface modification of titanium and titanium alloys, in particular to a method for preparing titanium nitride gradient coatings by laser on the surface of titanium and titanium alloys. Background technique [0002] Titanium and titanium alloys are widely used in aerospace, petrochemical, biomedical and other civil industries because of their advantages such as high specific strength, high thermal strength, good corrosion resistance, excellent low temperature toughness, good high temperature mechanical properties and excellent biocompatibility. and other fields have been widely used. However, the surface hardness of titanium and titanium alloys is low, the chemical activity is high, and the friction performance is poor under the condition of sliding friction, especially the friction and wear resistance are quite low, which seriously limits its application. Therefore, further improving the surface properties of titanium and...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/24C23C8/02
Inventor 韩彬王勇张成忠孙宁姣孙丰收王永刚付现桥李鹏
Owner 山东万丰煤化工设备制造有限公司
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