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Modified brass surface and preparation method and application thereof

A brass, modified technology, applied in welding equipment, manufacturing tools, laser welding equipment, etc., can solve the problems of unsuitable for large-scale application, cumbersome processing, etc., to increase the heat transfer rate of brass, simple process, improve condensation The effect of heat transfer efficiency

Inactive Publication Date: 2019-05-10
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is cumbersome to process and is not suitable for large-scale applications. At the same time, this method does not have laser selection texture preparation

Method used

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  • Modified brass surface and preparation method and application thereof
  • Modified brass surface and preparation method and application thereof
  • Modified brass surface and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiments of the present invention provide a modified brass surface and a preparation method thereof, the method comprising the following steps:

[0038] Step 1. Polish the H62 brass to be processed. Use a metallographic sample pre-grinder with a power of 370W, a grinding disc speed of 450 rpm, and a grinding disc diameter of 230mm. The polishing process requires an auxiliary diameter of 200mm and 1200 mesh. SiC water sandpaper is used for polishing on the brass surface, and the polishing range is 100cm 2 , polishing time 10 minutes, obtain the brass sample after surface polishing;

[0039] The brass sample after described surface polishing is cleaned with ultrasonic cleaning instrument, and ultrasonic cleaning instrument ultrasonic frequency is 40kHz, submerges sample surface with the deionized water of resistivity 18.25 megohm, at room temperature, clean continuously for 30 minutes, and then Clean with absolute ethanol. After cleaning, take out the sample and subme...

Embodiment 2

[0044] The preparation method of the modified brass surface of this embodiment, except that the pulse width of the laser described in step 2 and step 3 is 200 ns, the single pulse energy is 0.48 mJ, and the repetition frequency is 115 kHz; the rest is the same as that of embodiment 1.

Embodiment 3

[0046] The preparation method of the modified brass surface of this embodiment, except that the pulse width of the laser described in step 2 and step 3 is 100 ns, the single pulse energy is 0.2 mJ, and the repetition frequency is 200 kHz; the rest is the same as that of embodiment 1.

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Abstract

The invention provides a modified brass surface and a preparation method and application of the modified brass surface. The method comprises the steps that 1, a brass surface to be treated is polishedfor pretreatment, cleaned and dried to obtain a clean surface-polished brass sample; 2, laser scanning treatment is carried out on the surface of the brass sample through a pulse laser device, multiple micro-nano structures are machined on the surface of the sample, the brass surface is placed into an electric heating vacuum drying box to be baked, and the brass super-hydrophobic surface is obtained; 3, a wedged or triangular parallel-connected super-hydrophilic surface is obtained on the obtained brass super-hydrophobic condensed surface through laser processing treatment, and the super-hydrophobic super-hydrophilic wedged or triangular interphase surface is obtained. Chemical modification is avoided, the process is simple, operation is convenient, the cost is low, the prepared super-hydrophobic super-hydrophilic wedged or triangular interphase surface is quite beneficial to realization and continuous conducting of the droplet condensation process and has the excellent condensation performance, the brass heat exchange efficiency is improved, and condensation efficiency of a condensation pipe is improved.

Description

technical field [0001] The invention relates to the technical field of surface preparation, in particular to a modified brass surface and a preparation method thereof. Background technique [0002] The condenser tube is a device used to promote condensation, usually composed of double-layer glass tubes, which is a glass instrument that uses the principle of heat exchange to cool and condense steam into liquid. Because the diameter of the glass tube is limited, the contact area of ​​the high-temperature gas or liquid flowing through the inner tube is limited, so that the heat exchange is insufficient, and the final condensation efficiency is not high. If the size of the heat transfer equipment is increased, the condensation cost will be greatly increased. The surface of traditional condenser tubes such as glass, copper and stainless steel is hydrophilic (intrinsic contact angle is less than 90°), which is not conducive to the shedding of condensed droplets on the surface. Fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/00B23K26/352
Inventor 娄德元曹剑锋梅胜杨少坤曹佳丽郑重刘顿成健
Owner HUBEI UNIV OF TECH
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