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Method for strengthening shape memory alloy coating on blade surface of axial flow pump by jet flow cavitation

A technology of memory alloy and axial flow pump, which is applied in the coating process and coating of metal materials, can solve the problems of coating material waste, failure, and large surface coverage of blades, and achieve cavitation resistance and service life. Effect

Active Publication Date: 2020-11-20
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing problems are: (1) the actual effect of the coating is not ideal; (2) the coating covers a large area on the blade surface, and the coating material is seriously wasted
In the past, traditional thermal-mechanical treatment (including plastic deformation, aging, annealing, etc.) was used to strengthen copper-zinc-aluminum shape memory alloys, but it is easy to fail under long-term cavitation conditions.
However, the jet cavitation strengthening technology mentioned in the present invention has not yet been reported in terms of improving the surface coating performance of the flow-passing parts.

Method used

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  • Method for strengthening shape memory alloy coating on blade surface of axial flow pump by jet flow cavitation
  • Method for strengthening shape memory alloy coating on blade surface of axial flow pump by jet flow cavitation
  • Method for strengthening shape memory alloy coating on blade surface of axial flow pump by jet flow cavitation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]The laser cladding copper-zinc-aluminum shape memory alloy anti-cavitation coating of this embodiment includes the following components in mass percentage: Zn: 27%, Al: 4%, La: 0.05%, Ce: 0.05%, and the balance is Cu. The component raw materials of the shape memory alloy are ground and mixed in a vacuum ball mill. The grinding time is 20 minutes, and the particle size of the mixed powder is ground to 350 mesh, and the shape is spherical or nearly spherical. Laser cladding is carried out on the upper surface of the substrate by means of coaxial powder feeding using a fiber laser in an argon protective atmosphere. The laser power is 1500W, the spot diameter is 3mm, the scanning speed is 400mm / min, the overlap rate is 50%, the powder feeding speed is 10g / min, and the coating thickness is 1mm. Put the sample after laser cladding into the jet cavitation strengthening test bench. Pure water is used as the jet medium, the jet pressure is 20MPa, the medium temperature is kept...

Embodiment 2

[0036] The laser cladding copper-zinc-aluminum shape memory alloy anti-cavitation coating of this embodiment includes the following components in mass percentage: Zn: 24.7%, Al: 3.61%, La: 0.04%, Ce: 0.04%, and the balance is Cu. The component raw materials of the shape memory alloy are ground and mixed in a vacuum ball mill. The grinding time is 20 minutes, and the particle size of the mixed powder is ground to 350 mesh, and the shape is spherical or nearly spherical. Laser cladding is carried out on the upper surface of the substrate by means of coaxial powder feeding using a fiber laser in an argon protective atmosphere. The laser power is 1500W, the spot diameter is 3mm, the scanning speed is 400mm / min, the overlap rate is 50%, the powder feeding speed is 10g / min, and the coating thickness is 1mm. Put the sample after laser cladding into the jet cavitation strengthening test bench. Pure water is used as the jet medium, the jet pressure is 22MPa, the medium temperature i...

Embodiment 3

[0038] The laser cladding copper-zinc-aluminum shape memory alloy anti-cavitation coating of this embodiment includes the following components in mass percentage: Zn: 26%, Al: 3.8%, La: 0.045%, Ce: 0.045%, and the balance is Cu. The component raw materials of the shape memory alloy are ground and mixed in a vacuum ball mill. The grinding time is 20 minutes, and the particle size of the mixed powder is ground to 350 mesh, and the shape is spherical or nearly spherical. Laser cladding is carried out on the upper surface of the substrate by means of coaxial powder feeding using a fiber laser in an argon protective atmosphere. The laser power is 1500W, the spot diameter is 3mm, the scanning speed is 400mm / min, the overlap rate is 50%, the powder feeding speed is 10g / min, and the coating thickness is 1mm. Put the sample after laser cladding into the jet cavitation strengthening test bench. Pure water is used as the jet medium, the jet pressure is 25MPa, the medium temperature is...

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Abstract

The invention belongs to the technical field of material surface strengthening, and relates to a method for strengthening a shape memory alloy coating on the blade surface of an axial flow pump by jetfirstly flow cavitation. The method comprises the steps that a copper zinc aluminum shape memory alloy is placed at the position, where cavitation erosion is prone to occurring, of the blade surfaceof the axial flow pump through laser cladding, and then the axial flow pump blade is strengthened by jet flow cavitation; and by controlling the action time and target distance of the jet flow cavitation, the surface strengthening is realized, but the cavitation erosion of the blade is avoided. Under the condition of the jet cavitation strengthening process parameters, the copper zinc aluminum shape memory alloy as the coating absorbs the impact stress produced by a large number of cavitation bubble collapse, and a novel copper zinc aluminum shape memory alloy coating with a large number of fine structures, excellent shape memory effect and super elasticity is obtained, the cavitation corrosion resistance of flow passage components is improved, and the service life of flow passage components is prolonged.

Description

technical field [0001] The invention belongs to the technical field of material surface strengthening, and relates to a method for jet cavitation strengthening shape memory alloy coating on the blade surface of an axial flow pump. Background technique [0002] Cavitation is a complex phase transition phenomenon that occurs in liquids. When the local static pressure inside the liquid is lower than a certain pressure threshold, the tiny gas nuclei in the liquid will grow into cavitation bubbles visible to the naked eye. When the cavitation bubble migrates to the high-pressure area, it will collapse due to the imbalance of pressure inside and outside the bubble wall. When the cavitation bubble collapse occurs near the solid wall surface, an instantaneous impact load will be generated on the wall surface. When the same position on the wall surface is repeatedly subjected to the impact load generated by the cavitation bubble collapse, it will be strengthened, which is beneficial...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C9/04C22F1/08
CPCC23C24/106C22C9/04C22F1/08C22F1/006
Inventor 刘海霞魏笑郭顺刘光磊陈金豪邓濯陈杰
Owner JIANGSU UNIV