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Preparation method of multifunctional ocean engineering alloy

A marine engineering, multi-functional technology, applied in the field of marine metal materials, can solve the problems of difficult and effective mutual solubility, excessive precipitation drive, slow diffusion, etc., to stabilize the free energy of the system, avoid grain boundary segregation, and improve mutual solubility.

Active Publication Date: 2021-10-08
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical problem worth noting is: a alloy can maintain the ideal high mixing entropy structure in the solid state, that is, it must be sintered below the melting point
b When the mixing entropy of the alloy system is low, the combined effect of mixing entropy and temperature is low, and it is difficult to achieve effective mutual solubility in the powder metallurgy process
c When the mixing entropy of the alloy is too high, although the alloy can achieve effective mutual solubility in the powder metallurgy process, when the heat treatment temperature is high, there will be too much precipitation drive, resulting in excessive size of the precipitated phase; if the heat treatment temperature is too low, Diffusion slows, inhibits precipitate formation

Method used

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  • Preparation method of multifunctional ocean engineering alloy
  • Preparation method of multifunctional ocean engineering alloy
  • Preparation method of multifunctional ocean engineering alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The preparation method of 85wt%[Co(25)Cr(25)Fe(25)Ni(25)]+15wt%Cu alloy of multifunctional marine engineering alloy:

[0042] 1) Mixed ball mill

[0043] Utilize electronic balance, the Co(25)Cr(25)Fe(25)Ni(25)FCC base high-entropy alloy powder of 85wt% and the Cu powder of 15wt%; The high-entropy alloy powder is an atomized alloy powder, spherical, and particle size is 15-100μm, the purity of Cu powder is >99.9%, and the particle size is 5-50μm; put the weighed metal powder into a ball mill tank for mixing ball milling, the ball-to-material ratio is 2:1, mix at a speed of 200r / min for 12h, and ball mill After drying, a uniform pre-sintered powder is obtained;

[0044] 2) Promote miscible high-temperature sintering

[0045] Put the obtained mixed powder into graphite mold, then place it in SPS discharge plasma sintering furnace, and vacuumize the atmosphere in the furnace to 5×10 -3 Pa, pressurize the graphite mold up and down until the sample is under pressure of 40...

Embodiment 2

[0050] The preparation method of the multifunctional marine engineering alloy 95wt%[Co(20)Cr(30)Fe(30)Ni(20)]+5wt%Cu alloy:

[0051] 1) Mixed ball mill

[0052] Utilize electronic balance, the Co(20)Cr(30)Fe(30)Ni(20)FCC base high-entropy alloy powder of 95wt% and the Cu powder of 5wt%; The high-entropy alloy powder is an atomized alloy powder, spherical, and particle size is 15-100μm, the purity of Cu powder is >99.9%, and the particle size is 5-50μm; put the weighed metal powder into a ball mill tank for mixed ball milling, the ball-to-material ratio is 1:1, mix at a speed of 100r / min for 15h, and ball mill After drying, a uniform pre-sintered powder is obtained;

[0053] 2) Promote miscible high-temperature sintering

[0054] Put the obtained mixed powder into a graphite mold, then place it in an SPS discharge plasma sintering furnace, evacuate the atmosphere in the furnace to 10Pa, pressurize the graphite mold up and down until the sample is under pressure of 30MPa, and ...

Embodiment 3

[0059] The preparation method of multi-functional marine engineering alloy 80wt%[Co(30)Cr(20)Fe(20)Ni(30)]+20wt%Cu alloy:

[0060] 1) Preparation of Co(30)Cr(20)Fe(20)Ni(30)FCC-based high-entropy alloy powder

[0061] Co(30)Cr(20)Fe(20)Ni(30)FCC-based high-entropy alloy bulk was prepared by arc melting, and Co(30)Cr(20)Fe(20)Ni(30)FCC-based high-entropy alloy The block is placed in the atomization powder making equipment, vacuumed <10Pa, and then filled with high-purity argon for protection; the tundish is kept warm at 1400°C for 25 minutes; then the alloy is refined at 1550°C, and the refining time is 5min; Pour the alloy into the tundish, use high-pressure inert gas flow to crush the metal liquid into small droplets and quickly condense it into powder. .

[0062] 2) Mixed ball mill

[0063] Utilize electronic balance, the Co(30)Cr(20)Fe(20)Ni(30)FCC base high-entropy alloy powder of 80wt% and the Cu powder of 20wt%; The high-entropy alloy powder is an atomized alloy powde...

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Abstract

The invention discloses a preparation method of a multifunctional ocean engineering alloy. Through coupling of a multi-principal alloy structure, structural entropy and temperature and through powder metallurgy and heat treatment, the intersolubility between elements and the free energy of an alloy system are regulated and controlled, Cu grain boundary segregation is eliminated, and uniform and dispersed nano precipitation of the antifouling element Cu in the corrosion-resistant and high-plasticity multi-principal alloys is realized. The preparation method is simple and controllable to operate, and the prepared material has plasticity higher than 75%, high yield strength, excellent corrosion resistance and antifouling property and has important application prospects in the field of ocean engineering.

Description

technical field [0001] The invention relates to the technical field of marine metal materials, in particular to a preparation method of a multifunctional marine engineering alloy. Background technique [0002] At present, international resource and strategic competition has expanded from land to sea and space. my country has a vast ocean area, and the development of marine resources is crucial to the sustainable development of my country's economy and people's livelihood, and to stabilizing my country's international status. The important direction of my country's marine development is the deep sea and polar regions. The marine environment in deep sea and polar regions is complex, and the service conditions of equipment are harsh: the temperature in deep sea and polar regions is low, which can cause metal brittleness; seawater can corrode metals; marine microorganisms can attach to metal surfaces, accelerate corrosion, and increase movement resistance; coatings Surface tec...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C30/02C22F1/00
CPCC22C1/04C22C30/02C22F1/00C22C38/42C22C33/006B22F2003/1051B22F2003/248B22F2009/043B22F2999/00B22F1/065B22F1/05B22F2009/0824C22C1/0425C22C1/0433C22C33/0207
Inventor 于源乔竹辉刘维民高中堂王鲁杰汤华国张立志
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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