Method for enhancing antifouling properties of high entropy alloys

a high entropy alloy and antifouling technology, applied in the field of high entropy alloys, can solve the problems of significant losses in the fishing industry, dramatic societal and economic costs, and fish in the fishing net to die off, and achieve the effects of enhancing antifouling properties, preventing the attachment of marine organisms, and high entropy

Inactive Publication Date: 2017-09-21
POSTECH ACAD IND FOUND
View PDF3 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]It is an object of the invention to provide a method for enhancing the antifouling properties, that is, the ability to prevent the attachment of marine organisms such as barnacles, mussels, sea lettuces, and diatoms, of high entropy alloys used in ships or marine structures.
[0014]In order to address the above-identified problem, there is provided a method for enhancing the antifouling properties of high entropy alloys, the method being characterized by the use of severe plastic deformation to reduce the grain size in a high entropy alloy and thereby impart to the high entropy alloy a property of suppressing the attachment of aquatic or marine organisms.

Problems solved by technology

Moreover, the holes of fishing nets are blocked, inhibiting the supply of oxygen and thereby causing the fish in the fishing nets to die off, which results in significant losses to the fishing industry.
In addition, cleaning and replacement of damaged structures results in dramatic societal and economic costs.
However, TBT usage has recently caused significant environmental problems, which has resulted in TBT being legally regulated around the world starting in 2000, and thus difficult to use, and silicone based paints are limited in that the effectiveness of the antifouling effect is poor.
Therefore, various antifoulants are being developed to replace TBT, but do not fundamentally resolve the environmental problems.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for enhancing antifouling properties of high entropy alloys
  • Method for enhancing antifouling properties of high entropy alloys

Examples

Experimental program
Comparison scheme
Effect test

example

Example 1

[0024]In Example 1 of the invention, a Co—Cr—Fe—Mn—Ni based high entropy alloy was used, having excellent mechanical properties and excellent corrosion resistance, which, in particular, is an essential property for marine structures and ships.

[0025]The specific composition of the alloy is 10 at % of Co, 15 at % of Cr, 25 at % of Fe, 10 at % of Mn, and 40 at % of Ni.

[0026]First, a specimen for a high pressure torsion process was prepared using a high entropy alloy sheet (the grain size of the sheet is 15 μm) having a diameter of 10 mm and a thickness of 1.5 mm, and a torsion process in which the sheet was rotated under a pressure of 5 GPa was performed 10 times in order to reduce the structure of the material.

[0027]FIG. 1 is a photograph illustrating the microstructure of a high entropy alloy observed using transmission electron microscopy after a torsion process according to Example 1 of the invention is performed. As shown in FIG. 1, it was observed that the grains were re...

example 2

[0029]In order to confirm whether high pressure torsion deformation according to the invention can be used to obtain the same effect in other metal materials, a sheet (the grain size of the sheet is 20 μm) formed of STS304 stainless steel was prepared under the same conditions as Example 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
grain sizeaaaaaaaaaa
thicknessaaaaaaaaaa
pressureaaaaaaaaaa
Login to view more

Abstract

The invention relates to a method capable of enhancing both the antifouling properties of a high entropy alloy and also the mechanical properties thereof, without using chemical substances such as antifouling paints to prevent the attachment of animals and plants such as barnacles, mussels, sea lettuces, diatoms, etc., the method according to the invention being characterized by the use of severe plastic deformation to reduce the grain size in a high entropy alloy and thereby impart to the high entropy alloy a property of suppressing the attachment of aquatic or marine organisms, and according to the method, environmental issues caused by the use of antifouling paint, which is conventionally the most widely used method, may be resolved, and the energy efficiency of ships may be improved, thereby reducing societal and economic loss.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a method for enhancing the antifouling properties of high entropy alloys, and more particularly, to a method for enhancing the antifouling properties of high entropy alloys, wherein the attachment of animals and plants such as barnacles, mussels, sea lettuces, diatoms, etc., may be prevented without using chemical substances such as antifouling paints, while also improving the physical properties of the high entropy alloys.[0003]2. Description of the Related Art[0004]Marine organisms, such as various types of plankton, algae, shellfish, etc. attach to water contacting parts of marine structures. When the amount of organisms attached to a marine structure or ship increases, there is an increase in the weight of the marine structure or ship and an increase in the surface area of portions thereof which are exposed to water pressure due to ocean waves, and thus the functionality of the marin...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(United States)
IPC IPC(8): C22F1/10B21D11/14C22C30/00
CPCC22F1/10B21D11/14C22C30/00
Inventor KIM, HYOUNG SEOPAHN, DONG HYUNLEE, SUNG HAKJOO, SOO HYUNLEE, BYEONG JOONA, YOUNG SANGHONG, SUN LGMOON, JONG UNJANG, MIN JIHWANG, DONG SOO
Owner POSTECH ACAD IND FOUND
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap