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Method and device for modifying surfaces of inner wall and outer wall of cavity based on ultrasonic cavitation

A surface modification and ultrasonic technology, which is used in devices for coating liquids on surfaces, special surfaces, pretreated surfaces, etc. strong effect

Active Publication Date: 2021-06-25
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently used soaking method, the bonding force between the modified layer and the substrate is not strong, the effect is limited, and multiple soaking is required

Method used

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  • Method and device for modifying surfaces of inner wall and outer wall of cavity based on ultrasonic cavitation
  • Method and device for modifying surfaces of inner wall and outer wall of cavity based on ultrasonic cavitation
  • Method and device for modifying surfaces of inner wall and outer wall of cavity based on ultrasonic cavitation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The device for modifying the inner and outer walls of a cavity based on ultrasonic cavitation includes a device support unit 1 , an ultrasonic cavitation unit 2 , a coolant circulation unit 3 and a workpiece clamping unit 4 .

[0050] The device support unit 1 includes a water tank 101, a platform bottom plate 102, a connector I 103, a support column 104, a connector II 105 and a support beam 106; the water tank 101 is used to store the cooling liquid 304; the connector I 103 will The supporting column 104 is fixed on the platform floor 102 ; the connecting piece II 105 fixes the supporting beam 106 on the supporting column 104 .

[0051] The ultrasonic cavitation unit includes a power supply 201, a horn 202, electric wires 203, an ultrasonic generator 204 and a generator support base 205; the power supply 201 is an ultrasonic excitation device, which can control frequency, amplitude and working time; The center of the bottom surface of the rod 202 is provided with a thre...

Embodiment 2

[0055] This embodiment is the steps of modifying the surface of the inner and outer walls of the copper cavity workpiece:

[0056] Step 1. Rinse the copper cavity workpiece 403 with a size of 20mm×20mm×16mm, a wall thickness of 2mm, and an inlet diameter of 6mm with tap water; add 2g of modified silica particles 411 with a particle size of 20nm to 25mL of absolute ethanol and 25mL of distilled water mixture, stirred in a 300rpm magnetic stirrer for 5min to obtain the modified solution 407, which was loaded into the modified solution container 401; the cooling liquid 304 was poured into the cooling liquid container 305, and the extrusion pump 302 was started and pressed into the Pump 307, starts coolant circulation.

[0057] Step 2, tighten the cavity workpiece 403 by fastening screws 405 image 3 The bottom surface modified installation method shown is clamped to the workpiece fixture 404; the horn 202 is inserted into the modified liquid container 401 so that the cavity work...

Embodiment 3

[0061] This embodiment is the step of modifying the surface of the outer wall surface of the brass cavity workpiece:

[0062] Step 1. Rinse the brass cavity workpiece 403 with a size of 20mm×20mm×16mm, a wall thickness of 2mm, and an inlet diameter of 6mm with tap water; add 2g of modified silica particles 411 with a particle size of 20nm to 25mL of anhydrous In the mixture of ethanol and 25mL distilled water, stir in a 300rpm magnetic stirrer for 5 minutes to obtain the modified liquid 407, which is loaded into the modified liquid container 401; the cooling liquid 304 is poured into the cooling liquid container 305, and the extrusion pump 302 and the pressure pump 302 are started. Into the pump 307, start the coolant circulation.

[0063] Step 2: Seal the cavity workpiece 403 with the sealing cover 402 .

[0064] Step 3, tighten the cavity workpiece 403 by fastening screws 405 and image 3 The installation method shown for bottom surface modification is clamped to the workp...

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Abstract

The invention discloses a method and device for modifying surfaces of the inner wall and the outer wall of a cavity based on ultrasonic cavitation, and belongs to the technical field of ultrasonic cavitation surface modification. The device comprises a device supporting unit, an ultrasonic cavitation unit, a workpiece clamping unit and a cooling liquid circulating unit. The surfaces are eroded by micro jet flow and shock waves generated by collapse of ultrasonic cavitation bubble groups to form a micron-sized structure, nano particles are projected to the surfaces by the jet flow and are effectively anchored, and a nano-micron composite structure is formed. The problems of high cost, environmental pollution, weak binding force and the like of a traditional modification method are solved. Particularly, the device can be used for realizing surface modification of a small-size cavity, the technological process is simple, and the prepared surface is good in performance.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic cavitation surface modification, in particular to a method and device for modifying the surface of inner and outer walls of a cavity based on ultrasonic cavitation. Background technique [0002] The liquid forms a pressure wave due to ultrasonic vibration. When the partial pressure drops below the saturated gas pressure, a cavity is generated inside the liquid, that is, the phenomenon of "ultrasonic cavitation". With the continuation of the ultrasonic vibration, a large number of cavitation groups are generated near the vibration end. Cavitation groups grow, oscillate, and collapse periodically, accompanied by extreme phenomena such as high temperature, high pressure shock waves, and high-speed microjets. On the rigid wall, the jet and shock wave generated by the collapse of the cavitation group will affect the surface morphology and mechanical properties. The generation of cavitation is rela...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05C9/04B05C7/00B05C3/10B05D5/08B05D7/14B05D7/22B05D3/02C09D1/00C09D7/20
CPCB05C9/045B05C7/00B05C3/10B05D5/08B05D7/14B05D7/22B05D3/0272C09D1/00C09D7/20B05D2202/45B05D2202/25B05D2202/15B05D2202/30
Inventor 陈逢军杜建华
Owner HUNAN UNIV
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