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Laser cladding anti-cavitation-erosion coating and preparation method thereof

A laser cladding and coating technology, applied in the direction of coating, metal material coating process, etc., can solve the problems of insufficient anti-cavitation corrosion ability of ship propellers, and achieve the effect of good hardness and dense structure

Inactive Publication Date: 2020-04-28
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of insufficient anti-cavitation ability of ship propellers, the present invention provides a laser cladding anti-cavitation coating and a preparation method thereof to prepare a layer of shape memory alloy anti-cavitation coating to improve the anti-cavitation performance. And the shape memory alloy anti-cavitation coating is well bonded to the base metallurgy

Method used

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  • Laser cladding anti-cavitation-erosion coating and preparation method thereof
  • Laser cladding anti-cavitation-erosion coating and preparation method thereof
  • Laser cladding anti-cavitation-erosion coating and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] Titanium powder and nickel powder were weighed in the ratio of Ti:Ni=44%:56% by mass, put into a vacuum ball mill for grinding and mixing, and the grinding time was 20 minutes to make the powder particle size 300 mesh. Using a fiber laser, under an argon protective atmosphere, the argon gas flow rate is 15L / min, and the obtained powder is laser clad by coaxial powder feeding. The laser power is 1200W, the spot diameter is 3mm, the scanning speed is 6mm / s, the overlapping rate is 50%, and the powder feeding speed is 8g / min. A shape-memory alloy coating of Ti:Ni=44%:56% was obtained on the nickel-aluminum bronze surface.

Embodiment 2

[0032] Titanium powder and nickel powder are weighed in the ratio of Ti:Ni=44%:56% by mass percentage, put into a vacuum ball mill for grinding and mixing, the time is 20min, the powder particle size is 300 mesh, using a fiber laser, in argon Under the gas protection atmosphere, the flow rate of argon gas is 15L / min, and the obtained powder is carried out by laser cladding by means of coaxial powder feeding. The laser power is 1400W, the spot diameter is 4mm, the scanning speed is 8mm / s, the overlapping rate is 50%, and the powder feeding speed is 10g / min. A shape-memory alloy coating of Ti:Ni=44%:56% was obtained on the nickel-aluminum bronze surface.

Embodiment 3

[0034] Titanium powder and nickel powder are weighed in the ratio of Ti:Ni=44%:56% by mass percentage, put into a vacuum ball mill for grinding and mixing, the time is 20min, the powder particle size is 300 mesh, using a fiber laser, in argon Under the gas protection atmosphere, the flow rate of argon gas is 15L / min, and the obtained powder is carried out by laser cladding by means of coaxial powder feeding. The laser power is 1600W, the spot diameter is 5mm, the scanning speed is 10mm / s, the overlapping rate is 50%, and the powder feeding speed is 12g / min. A shape-memory alloy coating of Ti:Ni=44%:56% was obtained on the nickel-aluminum bronze surface.

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Abstract

The invention relates to a laser cladding anti-cavitation-erosion coating and a preparation method thereof, and belongs to the technical field of alloy coatings. The anti-cavitation-erosion coating isa shape memory alloy coating that is clad on the surface of a workpiece by a laser; and the shape memory alloy coating can absorb most of the energy and pulse stress generated by bubble-sweepdown based on cycling characteristics such as superelasticity and a shape memory effect of the shape memory alloy coating, and is subjected to superelastic deformation and martensite phase transformation, after external force is unloaded, the shape memory alloy coating is subjected to elastic recovery and martensite reverse phase transformation to be subjected to strain recovery, thus the most of the energy generated by the bubble-sweepdown can be buffered and dissipated, self-injury is avoided, and the purposes of prolonging the cavitation-erosion induction period and curbing initiation and propagation of cavitation-erosion cracks so as to improve anti-cavitation-erosion performance are realized. The technological process of laser cladding is simple, the coating can be prepared selectively at a local subtle position according to needs, and the cost is effectively reduced. The laser cladding titanium-nickel coating and the preparation method thereof can be used for preparation and repair of ship propellers, and have good economical efficiency and application prospects.

Description

technical field [0001] The invention relates to a laser cladding anti-cavitation coating and a preparation method thereof, belonging to the technical field of alloy coatings. Background technique [0002] Nickel-aluminum bronze is currently the preferred material for ship propellers due to its good comprehensive mechanical properties and corrosion resistance. However, the propeller will be corroded by seawater cavitation during high-speed operation, and long-term service will cause fatigue damage to the surface of nickel-aluminum bronze, resulting in failure of ship power propulsion, and its potential danger is huge. Near equiatomic ratio titanium-nickel alloys can absorb most of the impact energy generated by cavitation collapse through stress-induced martensite transformation and martensite reorientation, and have excellent cavitation resistance. However, due to the high price of raw materials, limited Its wide application. In view of the fact that fatigue cracks only ap...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22C14/00C22C19/03
CPCC22C14/00C22C19/007C22C19/03C23C24/103C23C24/106
Inventor 庄栋栋金果杨星宇杨董民杨佳郭天硕汤平伟
Owner JIANGSU UNIV
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