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Molten salt preparation method of B4C-coated TiB2 composite powder with core-shell structure

A core-shell structure and composite powder technology, which is applied in the field of molten salt preparation of B4C@TiB2 composite powder, can solve the problems of high sintering temperature, low fracture toughness and low bending strength of single-phase boron carbide, and achieves low cost, The effect of good electrical conductivity and excellent sintering performance

Pending Publication Date: 2022-05-03
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a kind of B 4 C@TiB 2 The preparation method of composite powder, with boron carbide and titanium powder as reaction raw materials, adopts molten salt method combined with particle shell core technology, in B 4 The surface of C particles introduces the second phase TiB with excellent performance 2 , to achieve nano-sized TiB 2 in B 4 The uniform and stable load on the C surface overcomes the defects of high sintering temperature, low fracture toughness, low bending strength and low electrical conductivity of single-phase boron carbide; and the preparation method involved is simple and easy to control, suitable for popularization and application

Method used

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  • Molten salt preparation method of B4C-coated TiB2 composite powder with core-shell structure
  • Molten salt preparation method of B4C-coated TiB2 composite powder with core-shell structure
  • Molten salt preparation method of B4C-coated TiB2 composite powder with core-shell structure

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Effect test

Embodiment 1

[0043] A B with a core-shell structure 4 C@TiB 2 The molten salt preparation method of composite powder comprises the following steps:

[0044] 1) Add 10g of boron carbide into a mixed acid containing 10mL of hydrofluoric acid (concentration: 40wt%) and 10mL of nitric acid (concentration: 65wt%), soak for 12h; then wash with deionized water for 3 times and absolute ethanol for 3 times, after filtration, dry in an 80°C blast drying oven;

[0045] 2) Weigh 7g of acid-corroded boron carbide and 3g of titanium powder, and mix them uniformly to obtain mixed reaction raw materials;

[0046] 3) take by weighing 25g sodium chloride and 25g potassium chloride, mix uniformly to obtain alkali metal base molten salt raw material;

[0047] 4) Mix the alkali metal salt-based molten salt raw material and the mixed reaction raw material evenly, then put it into a graphite crucible, place it in a box-type atmosphere furnace protected by an argon atmosphere, and heat the box-type atmosphere ...

Embodiment 2

[0051] A B with a core-shell structure 4 C@TiB 2 The molten salt preparation method of the composite powder is roughly the same as that of Example 1, except that the temperature of the box-type atmosphere furnace is raised to 800° C. and then kept for 6 hours.

Embodiment 3

[0053] A B with a core-shell structure 4 C@TiB 2 The molten salt preparation method of composite powder comprises the following steps:

[0054] 1) Add 10g of boron carbide into a mixed acid containing 10mL of hydrofluoric acid (mass concentration: 40%) and 10mL of nitric acid (mass concentration: 65%), soak for 12h; then wash with deionized water for 3 times and absolute ethanol 3 times, after filtering, dry in an 80°C blast drying oven;

[0055] 2) Weigh 6g of acid-etched boron carbide and 4g of titanium powder, and mix them uniformly to obtain mixed reaction raw materials;

[0056] 3) take by weighing 50g sodium sulfate and 50g potassium sulfate, mix uniformly to obtain alkali metal base molten salt raw material;

[0057] 4) Mix the alkali metal salt-based molten salt raw material and the mixed reaction raw material evenly, then put it into a graphite crucible, place it in a box-type atmosphere furnace protected by an argon atmosphere, and heat the box-type atmosphere fur...

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Abstract

The invention discloses a molten salt preparation method of B4C-coated TiB2 composite powder with a core-shell structure, which comprises the following steps: firstly, carrying out surface modification on boron carbide by using mixed acid, and then uniformly mixing with titanium powder to obtain a mixed raw material; and finally, mixing with a fused salt raw material, and carrying out high-temperature calcination to prepare the B4C-coated TiB2 composite powder with the core-shell structure. According to the preparation method, a molten salt method is combined with a particle shell-core technology, second-phase TiB2 with excellent performance is introduced into the surfaces of B4C particles, and uniform and stable loading of nano-sized TiB2 on the surfaces of B4C is realized; the defects of high sintering temperature, low fracture toughness, low bending strength, low conductivity and the like of single-phase boron carbide can be effectively overcome; the preparation method is simple, easy to control, low in cost and suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of functional materials and their synthesis, in particular to a B with core-shell structure 4 C@TiB 2 A molten salt preparation method for composite powder. Background technique [0002] Boron carbide (B 4 C) It is an engineering material with excellent comprehensive performance and broad application prospects. Because of its excellent physical and chemical properties, it is widely used in bulletproof materials, refractory materials, wear-resistant materials, self-lubricating materials, special acid-resistant materials, cutting and grinding tools And atomic reactor control and shielding materials, etc. However, because boron carbide atoms are connected by strong covalent bonds (covalent bonds account for more than 90%), high atomic activation energy, and low sintering activation energy, boron carbide not only has a high sintering temperature (even if sintered at normal pressure The temperature reaches 23...

Claims

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Application Information

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IPC IPC(8): C04B35/563C04B35/628
CPCC04B35/563C04B35/62828C04B2235/404C04B2235/5436C04B2235/5445
Inventor 李享成姚万凯陈平安朱颖丽朱伯铨
Owner WUHAN UNIV OF SCI & TECH
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