Reaction and ball grinding process to prepare in-situ reinforced Mg-based composite material

A composite material and ball milling technology, applied in the field of materials, can solve the problems of complex material forming process and low material density, and achieve the effect of uniform distribution, good mechanics, and good interface bonding

Inactive Publication Date: 2003-09-10
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After literature search, it was found that Min Jiayuan and others published the article "Al 4 C 3 Dispersion Strengthened Aluminum", which deals with the preparation of Al by reactive ball milling 4 C 3 Dispersion strengthened aluminum matrix composites, but only the reaction ball milling is used to synthesize Al 4 C 3 , and then use powder metallurgy to prepare composite materials, the material molding process is complicated, and there is a problem that the material density is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1 adopts pure magnesium as the original matrix material, divides into prefabricated body raw material with aluminum powder, titanium powder, boride carbon, with ball milling speed 450r / min, ball material ratio 5: 1 mixing 30min, then take powder, use 5MPa The pressure is pressed, and the pressure is maintained for 60s. The preformed body is pretreated at 150°C for 1 hour, soaked in flux for 30 minutes, and then the preformed body is placed in a magnesium melt at 740°C, and stirred after 10 minutes of heat preservation. The paddle was stirred at 200r / min, and the stirring time was 10min. After stirring for 10min, it was poured at 700°C for 5min, and the (TiB 2 +TiC) hybrid reinforced magnesium matrix composites. The material has a tensile strength of 214MPa and an elongation of 1.6%.

Embodiment 2

[0015] Embodiment 2 adopts pure magnesium as the original matrix material, and is divided into prefabricated body raw material with aluminum powder, titanium powder, carbon powder, with ball milling speed 700r / min, ball material ratio 25: 1 mixing 650min, then take powder, use 15MPa The pressure is pressed, and the pressure is maintained for 350s. The pressed preform is pretreated at 200°C for 40 minutes, soaked in flux for 45 minutes, and then the preform is placed in a magnesium melt at 760°C, and stirred after 40 minutes of heat preservation. Stirring at 600r / min for 20min, stirring for 20min and then standing at 740°C for 15min for pouring to prepare a TiC mixed reinforced magnesium matrix composite material with a mass percentage of 5%. The material has a tensile strength of 275MPa and an elongation of 2.8%.

Embodiment 3

[0016] Embodiment 3 adopts pure magnesium as the original matrix material, and is divided into prefabricated body raw material with zinc powder, titanium powder, carbon powder, with ball milling speed 650r / min, ball material ratio 25: 1 mixing 650min, then take powder, use 15MPa The pressure is pressed, and the pressure is maintained for 350s. The pressed preform is pretreated at 200°C for 40 minutes, soaked in flux for 45 minutes, and then the preform is placed in a magnesium melt at 760°C, and stirred after 40 minutes of heat preservation. Stirring at 600r / min for 20min, stirring for 20min and then standing at 740°C for 15min for pouring to prepare a TiC mixed reinforced magnesium-zinc matrix composite material with a mass percentage of 5%. The material has a tensile strength of 225MPa and an elongation of 2.5%.

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Abstract

The present invention belongs to the field of material technology. The technological process includes determining alloy element components; selecting reinforcing phase based on the lubricating property between the substrate and the reinforcing phase, controlling the reinforcing phase particle content in 2-15%, ball grinding compounded prefabricated body in high-energy ball mill to synthesize the prefabricated body containing the reinforcing phase for magnesium-base composite material and pressing the ball ground synthesized prefabricated body powder into block; smelting magnesium substrate material; stoving the prefabricated body at 150-250 deg.c for hr, fluxing treatment, adding the prefabricated body into magnesium melt at selected temperature, temperature maintenance and stirring; and casting with the melt after being letting stand.

Description

technical field [0001] The invention relates to a process for preparing magnesium-based composite materials, in particular to a process for preparing in-situ reinforced magnesium-based composite materials by reaction ball milling, which belongs to the field of materials. Background technique [0002] Magnesium-based composite material is one of the lightest structural materials, and magnesium-based composite material has high specific strength and specific stiffness, good castability and dimensional stability, good resistance to electromagnetic interference and shielding, and good damping coefficient , good vibration damping performance, little impact on the environment, no pollution, and its waste recycling rate is as high as 85%. It has broad application prospects in aerospace, automobile, motorcycle, computer, network technology, communication and other fields. Therefore, the development of magnesium-based composite materials is of great significance to energy saving and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/00C22C23/00C22C32/00
Inventor 张修庆王浩伟滕新营马乃恒
Owner SHANGHAI JIAO TONG UNIV
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