Method for preparing B4C nano-powder through in-situ combustion synthesis

A nano-powder, in-situ combustion technology, used in chemical instruments and methods, sustainable manufacturing/processing, carbon compounds, etc., can solve the problem of difficult control of reaction process and product morphology, low raw material utilization, and low product purity problem, to achieve the effect of controllable particle size distribution, low cost of raw materials and high purity

Inactive Publication Date: 2017-07-25
NORTHEASTERN UNIV
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Problems solved by technology

Activation by high-energy ball milling improves the low utilization rate of raw materials, low product purity, and difficulty in controlling the reaction process and product morphology of the traditional magnesia thermal reduction method; the self-propagating pulverization technology is used to obtain products with high purity and controllable particle size distribution. The advantages of high powder activity

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  • Method for preparing B4C nano-powder through in-situ combustion synthesis

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Effect test

Embodiment 1

[0049] A kind of in situ combustion synthesis preparation B 4 The method of C nanometer powder, its process flow chart sees figure 1 , specifically follow the steps below:

[0050] Step 1: Mechanical Activation

[0051] Boron oxide and magnesium powder are mixed in a molar ratio, put into a high-energy ball mill for mechanical activation treatment, and a boron-containing precursor mixture is obtained; wherein, in a molar ratio, B 2 o 3 : Mg=1:3; the process parameters of the high-energy ball mill are: the mass ratio of material to ball is 1:10, the ball milling speed is 300rpm, and the ball milling time is 30min.

[0052] Step 2: Self-propagating synthesis

[0053] The boron-containing precursor mixture and carbon nanopowder are mixed evenly in molar ratio, put into a mold, pressed into a block blank at 10MPa, placed in a self-propagating reaction furnace, and the self-propagating reaction is initiated by the local ignition method, and the temperature Control at 500°C to ...

Embodiment 2

[0062] A kind of in situ combustion synthesis preparation B 4 The method of C nanometer powder, carry out as follows:

[0063] Step 1: Mechanical Activation

[0064] Boron oxide and magnesium powder are mixed in a molar ratio, put into a high-energy ball mill for mechanical activation treatment, and a boron-containing precursor mixture is obtained; wherein, in a molar ratio, B 2 o 3 : Mg=1:2.5; The process parameters of the high-energy ball mill are: the mass ratio of material to ball is 1:15, the ball milling speed is 200rpm, and the ball milling time is 60min.

[0065] Step 2: Self-propagating synthesis

[0066] Mix the boron-containing precursor mixture and carbon nanopowder evenly in molar ratio, put it into the mold, press it into a block billet at 20MPa, place it in the self-propagating reaction furnace and use the local ignition method to initiate the self-propagating reaction, the temperature Control at 800°C to obtain the reaction material, and after the reaction ...

Embodiment 3

[0075] A kind of in situ combustion synthesis preparation B 4 The method of C nanometer powder, carry out as follows:

[0076] Step 1: Mechanical Activation

[0077] Boron oxide and magnesium powder are mixed in a molar ratio, put into a high-energy ball mill for mechanical activation treatment, and a boron-containing precursor mixture is obtained; wherein, in a molar ratio, B 2 o 3 : Mg=1:3; The technological parameters of the high-energy ball mill are: the mass ratio of material to ball is 1:20, the ball milling speed is 400rpm, and the ball milling time is 100min.

[0078] Step 2: Self-propagating synthesis

[0079] The boron-containing precursor mixture and carbon nanopowder are mixed evenly in molar ratio, put into a mold, pressed into a block billet at 40MPa, placed in a self-propagating reaction furnace, and the self-propagating reaction is initiated by the local ignition method, and the temperature Control at 800°C to obtain the reaction material, and after the rea...

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Abstract

The invention discloses a method for preparing B4C nano-powder through in-situ combustion synthesis, and belongs to the technical field of powdering in a powder metallurgy process. The method comprises the steps of mixing boron oxide and magnesium powder at a molar ratio, feeding into a high-energy ball mill for mechanical activation treatment; mixing with carbon nano-powder evenly at a molar ratio, putting into a mold, pressing into a block blank at 10-60MPa and then putting into a self-propagating reactor for triggering self-propagating reaction; immersing the product into diluted hydrochloric acid and carrying out intensified leaching in a closed reaction kettle; and finally carrying out spray pyrolysis to obtain a high-purity boron carbide nano-powder product. The high-purity and high-activity nano B4C powder is prepared through the method. The method is low in raw material cost, low in energy consumption, simple in operation, and low in requirement for technological conditions and instruments and equipment; and a foundation is laid for industrial production. By adopting high-energy ball milling activation, the disadvantages of a traditional magnesium heat reduction method are improved; and by adopting a self-propagating powder technology, the product has the advantages of high purity, controllable particle size distribution and high powder activity.

Description

technical field [0001] The invention belongs to the technical field of powder making in the powder metallurgy process, and specifically relates to an in-situ combustion synthesis preparation of B 4 C nano powder method. Background technique [0002] Boron carbide powder is mainly used to make boron carbide ceramics. Boron carbide ceramics have the characteristics of low density, high hardness, high modulus, strong wear resistance, high oxidation resistance, strong acid corrosion resistance and excellent neutron absorption performance. It has broad application prospects and is widely used in bulletproof materials, wear-resistant and self-lubricating materials, cutting and grinding tools, radiation-proof materials, and atomic reactor control and shielding materials. [0003] The existing boron carbide powder preparation methods include electric arc furnace carbothermal reduction method, carbon tube furnace carbothermal reduction method, intermediate frequency induction furnac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/991C01F5/10
CPCC01F5/10C01P2004/52C01P2004/62C01P2004/64C01P2006/80Y02P20/10
Inventor 豆志河张廷安刘燕谢恺煜范世钢石浩吕国志潘喜娟赵秋月牛丽萍傅大学张伟光
Owner NORTHEASTERN UNIV
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