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b4c/al composite material and preparation method thereof

A composite material and aluminum alloy melt technology, applied in the field of composite materials, can solve the problems of difficult wetting of boron carbide particles and aluminum matrix, uneven distribution of boron carbide particles, poor melt casting performance, etc., to eliminate local agglomeration, The effect of uniform mixing and improved performance

Active Publication Date: 2016-04-20
中广核工程有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to: provide a kind of B 4 C / Al composite material and preparation method thereof, to solve the problems of difficult wetting between boron carbide particles and aluminum matrix, uneven distribution of boron carbide particles, and poor melt casting performance

Method used

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  • b4c/al composite material and preparation method thereof
  • b4c/al composite material and preparation method thereof
  • b4c/al composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1. Pretreatment, weigh a certain amount of 325 mesh nuclear grade B 4 C raw powder, spread it on the container, place it in a resistance furnace, and heat it at 390°C for 2.1h in an air atmosphere.

[0035] Step 2. Grind and sieve the boron carbide powder obtained in step 1 to remove particles with a diameter of 100 microns or more, weigh 1.5 kg of boron carbide powder with a diameter of 10-100 microns and wrap it with aluminum foil.

[0036] Step 3. Take a certain amount of pure aluminum and heat and melt it in the furnace. When the temperature reaches 690°C, wrap a certain amount of pure magnesium with aluminum foil and press it into the melt; continue to heat up until the temperature rises to 700°C , add pre-weighed AlCu50, Zn, Al-Fe10, Al-Cr5, Al-Mn10, Al-Ti10 master alloys and stir to prepare a melt with the composition shown in the table below. Due to the appropriate amount of alloy elements, the matrix Not only is it conducive to the preparation of composit...

Embodiment 2

[0042] Step 1. Weigh a certain amount of 325 mesh nuclear grade B 4 C powder, spread it on the container, place it in a resistance furnace, and heat it at 400°C for 2h in an air atmosphere.

[0043] Step 2. Grind the boron carbide powder obtained in step 1 and sieve it, weigh 3.3 kg of boron carbide powder with a diameter of 10-100 microns and wrap it with aluminum foil.

[0044] Step 3. Take a certain amount of pure aluminum and heat and melt it in the furnace. When the temperature reaches 690°C, wrap a certain amount of pure magnesium with aluminum foil and press it into the melt; continue to heat up until the temperature rises to 700°C Add the pre-weighed AlCu50, Zn, AlFe10, AlMn10, AlCr5, AlTi10 master alloys and stir to configure the melt with the composition shown in the table below. After it is completely melted, refine the melt with argon blowing for 3 minutes and remove slag. The flow rate of argon gas used is 10cc / min, the refining time is 3 minutes, and the refinin...

Embodiment 3

[0050] Step 1. Weigh a certain amount of 325 mesh nuclear grade B 4 C powder, spread it on the container, place it in a resistance furnace, and heat it at 410°C for 1.9h in an air atmosphere.

[0051] Step 2. After grinding the boron carbide powder obtained in step 1, sieve it, weigh 5.75Kg of boron carbide powder with a diameter of 10-100 microns and wrap it with aluminum foil.

[0052] Step 3. Take a certain amount of pure aluminum and heat and melt it in the furnace. When the temperature reaches 690°C, wrap a certain amount of pure magnesium with aluminum foil and press it into the melt; continue to heat up until the temperature rises to 700°C Add the pre-weighed AlCu50, Zn, AlFe10, AlMn10, AlCr5, AlTi10 master alloys and stir to configure the melt with the composition shown in the table below. After it is completely melted, refine the melt with argon blowing for 3 minutes and remove slag. The flow rate of argon gas used is 10cc / min, the refining time is 3 minutes, and the...

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Abstract

The invention discloses a preparation method of a B4C / Al composite material. The preparation method comprises the following steps of: (1) pretreating boron carbide powder with the diameter of 10-100 micrometers, and then grinding and screening; (2) preparing an aluminum alloy fusant, refining by blowing argon, and deslagging; (3) adding the boron carbide powder obtained from the step (1) to the aluminum alloy fusant, reducing the temperature of the aluminum alloy fusant to the semi-solid state temperature interval of the aluminum alloy fusant, and carrying out mechanical stirring and electromagnetic stirring; (4) increasing the temperature of the stirred aluminum alloy fusant into a full liquid state, and then pressing the aluminum alloy fusant into a mould by exerting pressure on the aluminum alloy fusant. According to the preparation method of the B4C / Al composite material, the obtained B4C / Al composite material is uniform and dispersive in B4C granule distribution and compact in structure without the casting defects of obvious air hole and the like.

Description

technical field [0001] The invention belongs to the field of composite materials, more specifically, the invention relates to a B 4 C / Al composite material and its preparation method. Background technique [0002] B 4 C / Al has low density, high strength, high elastic modulus, high thermal conductivity and high neutron absorption capacity, so it is widely used in the fields of national defense, aerospace and nuclear power industry. high content of B 4 C of B 4 C / Al composite material has important applications in the nuclear power industry and is an ideal grid material for spent fuel storage. [0003] US patent US5,700,962 and Chinese patent invention patent ZL201010607497.5 disclose a B 4 A method for preparing a C / Al composite material, which includes: uniformly mixing aluminum powder and boron carbide powder by high-energy ball milling and pre-pressing into a billet, sintering the billet into a sintered billet, and extruding and hot-rolling the sintered billet to prep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C21/00B22F1/00
Inventor 束国刚刘伟刘彦章李丘林李学军罗志远高敏锐
Owner 中广核工程有限公司
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