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High-entropy alloy boride ceramic, and preparation method and application thereof

A technology of high-entropy alloys and borides, which is applied in the field of boride ceramic materials, can solve the problems of polluted raw materials, and achieve the effects of less segregation, fine grains, and increased hardness

Inactive Publication Date: 2019-06-11
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the mechanical alloying method is that the ball milling process, the ball milling medium, the atmosphere in the spherical tank, and the process control agent may contaminate the raw materials

Method used

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  • High-entropy alloy boride ceramic, and preparation method and application thereof
  • High-entropy alloy boride ceramic, and preparation method and application thereof
  • High-entropy alloy boride ceramic, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] a kind of Al y (FeNiCoCr) 1-x-y B x (x=1 / 3, y=1 / 3) high-entropy alloy boride powder, high-entropy alloy boride powder is composed of Al, Fe, Ni, Co, Cr and B elements, and the molar ratio of each element is Al:Fe :Ni:Co:Cr:B=1:1:1:1:1:1. Put it into the ball mill jar and carry out ball milling for 200 hours according to the ball milling design process parameters, and the powder after ball milling.

[0042] The ball-milled high-entropy alloy boride powder was put into a spark plasma sintering mold for sintering. The sintering process parameters were: heating rate 100°C / min, sintering temperature 1100°C, holding time 10min, constant pressure 30Mpa, and obtained Al 1 / 3 (FeNiCoCr) 1 / 3 B 1 / 3 ceramics.

[0043] figure 1 Al prepared for Example 1 1 / 3 (FeNiCoCr) 1 / 3 B 1 / 3 SEM images of high-entropy alloy boride powders at different magnifications. Among them, 1A is magnified 500 times, and 1B is magnified 4000 times. Depend on figure 1 It can be seen that the parti...

Embodiment 2

[0046] a kind of Al y (FeNiCoCr) 1-x-y B x (x=1 / 5, y=2 / 5) high-entropy alloy boride powder, high-entropy alloy powder is composed of Al, Fe, Ni, Co, Cr and B, and the molar ratio of each element content is Al:Fe:Ni: Co:Cr:B=1:1:1:1:1:0.5. After putting into the ball milling tank, carry out ball milling for 60 hours according to the ball milling design process parameters, the particle shape is spherical or nearly spherical with uniform particle size, and the particle size ranges from 5 to 45 μm.

[0047] The ball-milled high-entropy alloy boride powder was put into a spark plasma sintering mold for sintering. The sintering process parameters were: heating rate 100°C / min, sintering temperature 1100°C, holding time 10min, constant pressure 30Mpa, and obtained Al 0.2 (FeNiCoCr) 0.6 B 0.2 ceramics.

[0048] Figure 7 Al prepared for Example 2 0.2 (FeNiCoCr) 0.6 B 0.2 XRD pattern of high entropy alloy boride bulk. Such as Figure 7 It can be seen that the amount of borid...

Embodiment 3

[0050] a kind of Al y (FeNiCoCr) 1-x-y B x (x=1 / 2, y=1 / 4) high-entropy alloy boride powder, high-entropy alloy boride powder is made up of Al, Fe, Ni, Co, Cr and B, and each element content molar ratio is Al:Fe: Ni:Co:Cr:B=1:1:1:1:1:2. After putting into the ball milling tank, carry out ball milling for 60 hours according to the ball milling design process parameters, the particle shape is spherical or nearly spherical with uniform particle size, and the particle size ranges from 5 to 45 μm.

[0051] The ball-milled high-entropy alloy boride powder was put into a spark plasma sintering mold for sintering. The sintering process parameters were: heating rate 100°C / min, sintering temperature 1100°C, holding time 10min, constant pressure 30Mpa, and obtained Al 0.25 (FeNiCoCr) 0.25 B 0.25 ceramics. Figure 9 Al prepared for Example 3 0.25 (FeNiCoCr) 0.25 B 0.25 XRD pattern of high entropy alloy boride bulk. Such as Figure 9 It can be seen that the amount of borides gene...

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Abstract

The invention belongs to the technical field of boride ceramic materials, and discloses high-entropy alloy boride ceramic, and a preparation method and application thereof. The molecular formula of the high-entropy alloy boride ceramic is Al<y>(FeNiCoCr)<1-x-y>B<x>, wherein x is greater than or equal to 0 and less than or equal to 1, and y is greater than or equal to 0 and less than or equal to 1.The high-entropy alloy boride is prepared by the following steps: carrying out ball milling on Al, Fe, Ni, Co, Cr and B to prepare Al<y>(FeNiCoCr)<1-x-y>B<x> powder; then carrying out sintering by spark plasma sintering at a heating rate of 50-200 DEG C / min, a temperature of 800-1500 DEG C, and a constant pressure of 10-50 MPa; and carrying out furnace cooling. The Al<y>(FeNiCoCr)<1-x-y>B<x> high-entropy alloy boride powder prepared by the method consists of spheroids and is small in particle size, the ceramic main phase is a face center cubic (FCC) solid solution dispersed and distributed with Fe and Cr metal borides, and high density and relatively high hardness and wear resistance are achieved.

Description

technical field [0001] The invention belongs to the technical field of boride ceramic materials, and more specifically relates to a high-entropy alloy boride ceramic (Al y (FeNiCoCr) 1-x-y B x , 0≤x≤1, 0≤y≤1) and its preparation method and application. Background technique [0002] At the end of the last century, the concept of high-entropy series materials was proposed, which is composed of 5 or more elements, the atomic percentage of each element is between 5% and 35%, and the structure is simple, mostly BCC phase, FCC phase or BCC+FCC biphasic structure. The alloy components are highly disordered, simple in structure, mostly BCC, FCC or BCC+FCC dual-phase structure, and the high entropy effect effectively inhibits the generation of intermetallic compounds. [0003] In recent years, high-entropy materials have been widely studied by scholars at home and abroad because of their high strength, high hardness, wear resistance, corrosion resistance, and high temperature sof...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/65C04B35/645
CPCC04B35/58C04B35/645C04B35/65
Inventor 龙莹车金涛黄路江林华泰
Owner GUANGDONG UNIV OF TECH
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