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Method for preparing graphite-reinforced anti-attrition heat and electricity conduction coating layer by supersonic laser deposition

A supersonic laser, conductive coating technology, applied in coating, metal material coating process, metal processing equipment, etc., can solve the problems of high porosity, reducing the critical deposition rate of powder, and low deposition efficiency.

Inactive Publication Date: 2020-07-07
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0005] Aiming at the limitations of low deposition efficiency, poor bonding strength and high porosity in the products prepared by the above-mentioned existing cold spraying, the present invention provides a method for preparing graphite-enhanced friction-reducing, thermally and electrically conductive coatings by supersonic laser deposition. The laser beam is introduced synchronously during the cold spraying process. Through the irradiation of the laser, the powder particles are softened but not melted, the critical deposition speed of the powder is reduced, the deposition efficiency of the powder is improved, and the bonding force of the coating is improved to solve the problem of single cold spraying. Many bad problems of the coating, greatly improving the comprehensive performance of the composite coating

Method used

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  • Method for preparing graphite-reinforced anti-attrition heat and electricity conduction coating layer by supersonic laser deposition
  • Method for preparing graphite-reinforced anti-attrition heat and electricity conduction coating layer by supersonic laser deposition
  • Method for preparing graphite-reinforced anti-attrition heat and electricity conduction coating layer by supersonic laser deposition

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Embodiment 1

[0040]Take the copper plate (80mm*40mm*5mm) as the base material, firstly carry out the sandblasting treatment on the base material, and use 24# white corundum to carry out the sandblasting treatment under the air pressure of 0.8MPa to improve the surface roughness and remove the surface oxide, and then Clean it in an ultrasonic cleaner to remove surface impurities, then clean it with absolute ethanol, and then wipe it to dry. Fix the treated substrate on the bench. Spherical graphite (particle size is 25μm spherical graphite powder such as figure 1 Shown) (20vol.%) and Cu powder are fully mixed and then dried, then put into the powder feeder. Set the spray carrier gas (N 2 ) pressure is 4MPa, the powder feeding rate is 1.5rpm, the powder preheating temperature is 500°C, the spraying distance is 30mm, and the scanning speed is 10mm / s. Change the laser power (0W, 600W, 800W, 1200W, 1400W, 1600W respectively) during the spraying process. Do single-pass spraying, and finally ...

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Abstract

The invention provides a method for preparing a graphite-reinforced anti-attrition heat and electricity conduction coating layer by supersonic laser deposition. The method is to synchronously introduce a laser beam in the cold spraying process; and through a radiation effect of the laser, powder particles are softened without being molten, so that the critical deposition speed of powder is lowered, the deposition efficiency of the powder is improved, the bonding force of the coating layer is increased, multiple defects of the coating layer prepared by single cold spraying are solved, the comprehensive performance of a composite coating layer is greatly improved, both economy and environmental protection are achieved, and the idea of green development is quite met.

Description

technical field [0001] The invention belongs to the field of surface modification of metal materials, and in particular relates to a method for preparing a graphite-reinforced friction-reducing, thermally and electrically conductive coating by supersonic laser deposition. Background technique [0002] Copper and its alloys have strong ductility, corrosion resistance, and electrical and thermal conductivity, but they have shortcomings in terms of lubrication and wear resistance. Copper-based composite materials with excellent comprehensive properties are prepared by adding particle reinforcement phases to copper and its alloys to uniformly disperse them in the matrix. The preparation method is convenient and the cost is low. While maintaining the excellent characteristics of copper itself, it also endows it with good lubricating and frictional properties, as well as electrical and thermal conductivity. Among these particle-reinforced composite materials, copper-based graphit...

Claims

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Application Information

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IPC IPC(8): C23C24/08B22F1/02C23C18/38C23C18/18
CPCC23C24/085C23C18/38C23C18/1639C23C18/1886B22F1/17
Inventor 李波章钢姚建华
Owner ZHEJIANG UNIV OF TECH
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