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Method for preparing B4C fiber through in-situ combustion

An in-situ combustion and fiber technology, applied in the field of ceramic fibers, can solve the problems of low product purity, low raw material utilization rate, difficult control of reaction process and product morphology, etc., to achieve high purity, ensure leaching efficiency, and improve product added value. Effect

Active Publication Date: 2017-09-05
NORTHEASTERN UNIV
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AI Technical Summary

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

Method used

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  • Method for preparing B4C fiber through in-situ combustion

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Comparison scheme
Effect test

Embodiment 1

[0049] A kind of in situ combustion synthesis preparation B 4 The method of C fiber, 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] Mix the boron-containing precursor mixture and carbon fiber evenly in molar ratio, put it into the mold, press it into a block billet at 10MPa, place it in a self-propagating reaction furnace, and use the local ignition method to initiate the self-propagating reaction, and the temperature is controlled at 500°C , to obtai...

Embodiment 2

[0062] A kind of in situ combustion synthesis preparation B 4 The method of C fiber is carried 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 fiber evenly in molar ratio, put it into the mold, press it into a block billet at 20MPa, place it in a self-propagating reaction furnace, and use the local ignition method to initiate the self-propagating reaction, and the temperature is controlled at 800°C , to obtain the reaction material, after the reaction mater...

Embodiment 3

[0075] A kind of in situ combustion synthesis preparation B 4 The method of C fiber is carried 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] Mix the boron-containing precursor mixture and carbon fiber evenly in molar ratio, put it into the mold, press it into a block billet at 40MPa, place it in a self-propagating reaction furnace, and use the local ignition method to initiate the self-propagating reaction, and the temperature is controlled at 600°C , to obtain the reaction material, after the reaction ...

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Abstract

The invention discloses a method for preparing B4C fiber through in-situ combustion, and belongs to the technical field of ceramic fibers. The method comprises the following steps: mixing boric oxide and magnesium powder according to a mole ratio, and performing mechanical activation treatment in a high-energy ball mill; further uniformly mixing with a carbon fiber according to a mole ratio, putting into a mold, pressing at 10-60MPa so as to obtain a blocky blank, and performing self-propagating reaction; soaking a product into diluted hydrochloric acid, performing intensified leaching in a sealed reaction kettle, and finally performing spray thermal decomposition, thereby obtaining a high-purity boron carbide fiber product. By adopting the method, a two-dimensional ceramic fiber material which is high in purity, high in activity and good in sintering property is prepared. The method is low in raw material cost, low in energy consumption, simple to operate and low in process condition and instrument equipment requirement, and the situations that a conventional two-dimensional fiber structure is high in energy consumption for producing B4C and low in yield are changed. Due to high-energy ball milling activation, defects of a conventional magnesiothermic reduction method are alleviated; and due to a self-propagating powdering technique, the prepared product has the advantages of being high in purity, controllable in granularity distribution and high in powder activity.

Description

technical field [0001] The invention belongs to the technical field of ceramic fibers, and in particular relates to an in-situ combustion synthesis preparation of B 4 C fiber method. Background technique [0002] Boron carbide 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. Broad application prospects, 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, etc. [0003] Boron carbide is the most important material for impact applications such as body armor, tank front fenders, and military combat vehicle panels. In military combat, it can greatly improve the survivability and mobility of vehicles and aircraft, as well as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/622C01F5/04B82Y40/00
CPCC01F5/04C01P2004/62C01P2004/64C04B35/563C04B35/62277C04B2235/3409C04B2235/5248
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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