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Recycling and regenerating method of boron carbide aluminum-based composite material

A composite material, boron carbide aluminum technology, applied in the field of metal matrix composite material slurry recycling, can solve the problems of increasing the viscosity of melt slurry, casting failure, etc., to reduce viscosity, improve success rate, and reduce interface reaction The effect that occurs

Active Publication Date: 2019-05-17
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the existing known solutions, there is a contradiction in the melting time for the recovery and regeneration of the material: on the one hand, in order to ensure the success of the recovery and the uniformity of the products formed by the recovery, the temperature and time of the above-mentioned melting process must be increased; on the other hand , B in the existing known scheme 4 Serious interfacial reaction between C and aluminum melt occurs, the higher the temperature, the longer the time, the more reaction products will be generated, such as AlB 2 、Al 3 Brittle phases such as BC increase the viscosity of the melt slurry, resulting in casting failure

Method used

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  • Recycling and regenerating method of boron carbide aluminum-based composite material
  • Recycling and regenerating method of boron carbide aluminum-based composite material
  • Recycling and regenerating method of boron carbide aluminum-based composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The aluminum matrix composite material containing 31% mass fraction of boron carbide is recycled, and the composite material also contains 3.5% mass fraction of Ti, and Ti is represented as TiB in the composite material 2 The form is densely coated on the boron carbide particles. Recycled composite materials include tailings from the casting process, trimmings of rolled plates, and part of the remaining material after sampling and testing on the 4-meter-long product plate.

[0046] Cut 30kg of the above-mentioned recycled materials into small pieces with a maximum size of 40mm, wash them with hot soapy water for 10 minutes, dry them in a vacuum oven, transfer them to a stainless steel container, put them into a pit furnace, and raise the temperature to 580 within 1 hour. ℃; prepare a vacuum stirring furnace at the same time, preheat the empty furnace until the crucible temperature is 750 ℃, after the temperature is stable, transfer the above-mentioned materials to be re...

Embodiment 2

[0049] The other parameters and steps of this example are the same as those of Example 1, the difference is that the heating temperature of the vacuum stirring furnace is increased to 800°C, and the microstructure of the obtained material is as follows image 3 As shown, it can be seen that in the structure of the composite material, boron carbide and TiB coated on the surface of boron carbide can be seen 2 , aluminum alloy matrix, also produced a small amount of AlB 2 (as indicated by the arrow in the figure), but AlB 2 The production will not affect the recovery work.

Embodiment 3

[0051] The other parameters and steps of this example are the same as those of Example 1, the difference is that the heating temperature of the vacuum stirring furnace is increased to 850°C, and the microstructure of the obtained material is as follows Figure 4 As shown, it can be seen that in the structure of the composite material, boron carbide and TiB coated on the surface of boron carbide can be seen 2 , aluminum alloy matrix, also produced AlB 2 (As indicated by the arrow in the figure), AlB 2 Compared with the second embodiment, the quantity has increased, but it does not affect the recovery work.

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Abstract

The invention relates to the field of preparation of a metal-based composite material, and discloses a recycling and regenerating method of a boron carbide aluminum-based composite material. The method comprises the following steps that the boron carbide aluminum-based composite material to be recycled is cleaned, wherein the material to be recycled contains Ti, and at least part of Ti coats the surfaces of the boron carbide particles in the form of TiB-2 compounds; and the material to be recycled is subjected to casting so as to obtain the novel boron carbide aluminum-based composite material. According to the method, compared with the prior art, the surfaces of the boron carbide particles are coated with the TiB-2 compounds to be protected, so that on the basis of the same heating temperature and the same heating time, interface reaction is obviously reduced, and the viscosity of a melt is reduced; and or on the basis that interface reaction is not remarkably increased, the heating temperature and the heating time of the material to be recycled are increased, the melt obtained by melting the material to be recycled has higher liquidity and uniformity in the end, so that the success rate of recycling and regenerating and the uniformity of the product obtained by recycling can be improved.

Description

technical field [0001] The invention relates to the field of preparation of metal matrix composite materials, in particular to a method for recycling metal matrix composite slurry. Background technique [0002] The preparation of metal matrix composites by using liquid stirring method is a method with short preparation period, high product yield and uniform and dense billet structure. Compared with the traditional powder metallurgy method, this method also has the advantage of low raw material cost, and is more suitable for tens of Preparation of large batches of kilograms or more. B 4 C-Al neutron absorbing material is a typical ceramic particle reinforced metal matrix composite material. Because it contains a large amount of 10B isotope capable of absorbing neutrons, it is widely used in the nuclear industry and protective absorbing materials in radioactive environments, and has been widely used. Optimization of scientific research and production personnel. The material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22C1/02
CPCY02P10/20
Inventor 李丘林束国刚刘伟张腾飞王靓郭珍江
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV