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High-entropy boride powder and preparation method thereof

A boride and powder technology, applied in the field of high-entropy boride powder and its preparation, can solve the problems of long time, high preparation cost, and many operating procedures, and achieve the effects of convenient operation, good crystallinity, and stable process

Active Publication Date: 2021-05-25
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most of the existing methods have high preparation costs, many operating procedures, long time, low efficiency, and problems such as oxidation pollution are prone to occur in the process, and it is difficult to realize industrial application.

Method used

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Effect test

preparation example Construction

[0026] The present invention is realized in the following manner: a kind of preparation method of high entropy boride is characterized in that comprising the following steps:

[0027] Step (1) weighing: take by weighing required raw material according to the mass percentage of boron element (mass fraction is 1%-5%): industrial pure aluminum (mass fraction is 15.04%-63.98%), aluminum-boron master alloy (mass fraction The fraction is 33.34%-71.42%, wherein the mass fraction of boron in the aluminum-boron master alloy is 3%-7%), the high-purity transition metal elements elemental Fe (0.5%-2.54%), Cr (mass fraction 0.46%-2.36%), V (0.46%-2.32% by mass fraction), Zr (0.82%-4.14% by mass fraction) and Ti (0.44%-2.18% by mass fraction), where Ti, Cr, V , Zr and Fe are in an equimolar ratio, and a certain amount of pure Ti particles are weighed to remove the remaining oxygen in the electric arc furnace. Grind and ultrasonically clean the raw materials before weighing to prevent oil a...

Embodiment 1

[0035] The mass fraction of boron element is the Al-3B master alloy of 3% as raw material, and concrete implementation steps are as follows:

[0036] Step (1) weighing: take each raw material by weighing 1% by mass percentage of boron element: industrial pure aluminum (mass fraction is 63.98%), aluminum-boron master alloy (mass fraction is 33.34%), high-purity transition metal element Elemental Fe (0.5% by mass), Cr (0.46% by mass), V (0.46% by mass), Zr (0.82% by mass) and Ti (0.44% by mass).

[0037] Step (2) smelting:

[0038] 1) putting the material weighed in step (1) into a water-cooled copper crucible of a vacuum electric arc furnace; placing the pure Ti particles for oxygen absorption in another water-cooled copper crucible;

[0039] 2) Vacuum the electric arc furnace, when the vacuum degree is greater than 5×10 -3 Pa, rush into the inert gas argon until the pressure in the furnace is negative 0.05Pa;

[0040] 3) Turn on the smelting DC power switch, first smelt pur...

Embodiment 2

[0044]The mass fraction of boron element is the Al-5B master alloy of 5% as raw material, and concrete implementation steps are as follows:

[0045] Step (1) weighing: the mass percentage of boron element is 3% to weigh each raw material: industrial pure aluminum (mass fraction is 31.9%), aluminum-boron master alloy (mass fraction is 60%), high-purity transition metal element Elemental Fe (1.52% by mass), Cr (1.42% by mass), V (1.38% by mass), Zr (2.48% by mass) and Ti (1.3% by mass).

[0046] Step (2) smelting:

[0047] 1) putting the material weighed in step (1) into a water-cooled copper crucible of a vacuum electric arc furnace; placing the pure Ti particles for oxygen absorption in another water-cooled copper crucible;

[0048] 2) Vacuum the electric arc furnace, when the vacuum degree is greater than 5×10 -3 Pa, rush into the inert gas argon until the pressure in the furnace is negative 0.05Pa;

[0049] 3) Turn on the smelting DC power switch, first smelt pure Ti part...

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Abstract

The invention belongs to the field of high-entropy ceramic materials, and particularly relates to high-entropy boride powder and a preparation method thereof. The preparation method comprises the following steps: (1) weighing of raw materials: specifically, weighing industrial pure aluminum, transition metal particles and aluminum-boron binary intermediate alloy in proportion; (2) smelting: putting the raw materials weighed in the step (1) into a water-cooled copper crucible of a vacuum arc furnace, and conducting smelting to obtain an aluminum alloy ingot; and (3) extraction: extracting the aluminum alloy ingot obtained in the step (2) through a hydrochloric acid solution so as to obtain the high-entropy boride powder. According to the method, high-entropy boride is formed through an in-situ chemical reaction between a transition metal element and a boron element in an aluminum melt; and then, the aluminum alloy ingot containing the high-entropy boride is corroded with hydrochloric acid, and an extract is dried, so black high-entropy boride powder is obtained. The method has the characteristics of simple process, low cost and high production efficiency.

Description

technical field [0001] The invention belongs to the field of high-entropy ceramic materials, and in particular relates to a high-entropy boride powder and a preparation method thereof. Background technique [0002] Since the concept of high entropy was proposed in 2004, it has been applied to the development of various materials including metal materials and ceramic materials. In view of the novel properties brought by the high entropy effect to materials, it has become a hot spot in the field of material research. Compared with traditional ceramics, high-entropy ceramics have a series of excellent properties, such as high melting point, high hardness, low thermal conductivity, and oxidation resistance, etc., and their application prospects are very broad. [0003] At present, the research on high-entropy ceramic materials mainly focuses on high-entropy oxides, high-entropy borides, and high-entropy carbides. Among them, the research on high-entropy borides mainly focuses o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/626C23F1/20
CPCC04B35/58078C04B35/62605C04B35/6265C04B35/62665C23F1/20C04B2235/404C04B2235/405C04B2235/421
Inventor 聂金凤智雅婷范勇曹阳周浩李玉胜赵永好
Owner NANJING UNIV OF SCI & TECH
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