Preparation method of nano-diamond friction coat by laser coating

A nano-diamond and laser cladding technology, applied in metal material coating process, coating and other directions, can solve the problems of poor matrix bonding performance, loose organization, particle shedding, etc., to achieve uniform composition, reduce crack sensitivity, The effect of avoiding the loss of diamond material

Active Publication Date: 2009-10-21
CSIC NO 12 RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method of preparing nano-diamond anti-friction coating by laser cladding, which solves the problems of low coating strength, loose structure

Method used

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  • Preparation method of nano-diamond friction coat by laser coating
  • Preparation method of nano-diamond friction coat by laser coating

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Experimental program
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Effect test

Embodiment 1

[0021] Add 20% nano-diamond powder to the iron-based alloy powder, put the mixed powder into alcohol, and use a digital ultrasonic generator to generate 28 / 40KHz frequency ultrasound for ultrasonic vibration and mixing for 10 minutes; then evaporate the alcohol, and pass through Ball mill to mix. The workpiece to be clad is placed in the vacuum chamber first, and the mixed powder obtained in the previous step is preset on the surface of the workpiece to be clad by a gravity powder feeder, and the solid YAG pulsed laser is introduced into the vacuum chamber through an optical fiber for cladding. The cladding power is 400W, the pulse frequency is 10Hz, the pulse width is 3ms, and the vacuum degree is greater than 1×10 -3 Pa. The thickness of the obtained cladding layer reaches 1.5 mm, and the mass loss is 62% of that of GCr15 when it is rubbed against GCr15.

Embodiment 2

[0023] Add 10% nano-diamond powder to the Ni35 alloy powder, put the mixed powder into alcohol, and use a digital ultrasonic generator to generate 28 / 40KHz frequency ultrasound for ultrasonic vibration and mixing for 10 minutes; then evaporate the alcohol. Put the workpiece to be clad into the vacuum chamber first, pre-set the mixed powder obtained in the previous step on the surface of the workpiece to be clad by pre-spreading powder, and guide the solid YAG pulse laser into the vacuum chamber through the optical fiber for cladding. Laser cladding The power is 300W, the pulse frequency is 30Hz, the pulse width is 8ms, and the vacuum degree is greater than 1×10 -3 Pa. The thickness of the obtained cladding layer is about 1 mm, and the mass loss is 56.3% of that of GCr15 when it is rubbed against GCr15.

Embodiment 3

[0025] Add 5% nano-diamond powder to the GH30 alloy powder, put the mixed powder into alcohol, and use a digital ultrasonic generator to generate 28 / 40KHz frequency ultrasound for ultrasonic vibration and mixing for 10 minutes; then evaporate the alcohol. Put the workpiece to be clad into the vacuum chamber first, pre-set the mixed powder obtained in the previous step on the surface of the workpiece to be clad by pre-spreading powder, and guide the solid YAG pulse laser into the vacuum chamber through the optical fiber for cladding. Laser cladding The power is 150W, the pulse frequency is 20Hz, the pulse width is 5ms, and the vacuum degree is greater than 1×10 -3 Pa. The thickness of the obtained cladding layer is about 0.5mm, and the mass loss is 62% of the matrix when it is rubbed against the GH30 matrix.

[0026] figure 1 It is the diamond phase diagram in the nano-diamond antifriction coating prepared in embodiment 1, and the magnification is 2×10 4 times from figure 1...

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Abstract

The invention discloses a preparation method of nano-diamond friction coat by laser coating. The preparation method comprises the steps as follows: 5%-20% of nano-diamond powder is added into alloy powder, the mixed powder is then put into alcohol and mixed by ultrasonic vibration, wherein, the ultrasound frequency is 28/40 kHz, the mixing time is 10 minutes, and the alcohol is vaporized; the work piece to be coated is firstly placed in a vacuum chamber and the mixed powder obtained in last step is then pre-placed on surface of the work piece to be coated by powder laying or automatic powder feeding; solid YAG pulsed laser is used to coat in the vacuum chamber by direct entering or transiting and optical fibre guiding; the laser coating power is 150W-400W, the pulse frequency is 10-30Hz, the pulse width is 3-8ms, and the vacuum degree in the vacuum chamber is not lower than 1*10Pa. The nano-diamond friction coat prepared by the method of the invention has high coating strength, compact organizational structure and excellent bonding performance with a matrix.

Description

technical field [0001] The invention belongs to the technical field of surface engineering, and relates to a method for preparing a nano-diamond anti-friction coating, in particular to a method for preparing a nano-diamond anti-friction coating by laser cladding. Background technique [0002] Nano-diamond powder is used as the reinforcing phase of the composite coating, and the anti-friction coating can be obtained by spraying, vacuum melting and other means. The existing preparation method is: mixing nano-diamond powder into metal-based powder, bonding or directly covering the surface of the workpiece to be clad, and then vacuum melting or thermal spraying to obtain diamond anti-friction coating. The anti-friction coating prepared by the above method has low strength and poor bonding performance with the substrate, and cannot meet the long-life use under high temperature and high alternating load conditions. On the one hand, the loose structure of the coating causes partic...

Claims

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Application Information

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IPC IPC(8): C23C24/10
Inventor 魏刚马中伟张镜斌王育召穆耀钊
Owner CSIC NO 12 RES INST
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