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Device and method for separate preheating and one-step infiltration extrusion forming of magnesium-based composite

A composite material and extrusion forming technology, which is applied in the field of separate preheating and one-time impregnation extrusion forming of magnesium-based composite materials, and can solve the problem of metal-based composite materials. Poor material performance and other problems, to achieve the effect of slowing down the capillary phenomenon, ensuring the quality of the preparation, and reducing the content of impurities

Active Publication Date: 2015-07-01
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the shortcomings of the poor performance of metal matrix composites prepared by existing vacuum pressure impregnation devices, the present invention provides a separate preheating and one-time impregnation extrusion molding device for magnesium-based composites

Method used

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  • Device and method for separate preheating and one-step infiltration extrusion forming of magnesium-based composite
  • Device and method for separate preheating and one-step infiltration extrusion forming of magnesium-based composite

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Method Example 1: The matrix metal used in this example is AZ91D magnesium alloy, the liquidus is 596°C, and the preform 3 is made of T300 chopped carbon fiber with a volume fraction of 15-20%, which is prepared by a wet method, that is, carbon fiber, Pore ​​agent, dispersant, adhesive and distilled water are mixed and stirred in a certain proportion, and the fibers are uniformly dispersed and poured into the mold to filter out water and press to form, and then dried at low temperature to obtain a prefabricated body. The preform is deposited pyrolytic carbon coating on the surface of carbon fiber by chemical vapor deposition method, and the deposition parameters are: N2 flux is 0.2m 3 / h, the CH4 feed rate is 20L / h, the deposition temperature is 1000°C, and the deposition time is 1.5 hours.

[0029] First, the lower sealing block 9 is pressed into the bottom of the extrusion cylinder 7, and the extrusion cylinder 7 is fixed on the base 13, the preform preheating chamber...

Embodiment 2

[0030] Method Example 2: The base metal used in this example is AZ91D magnesium alloy, and the liquidus is 596°C. The prefabricated body 5 adopts T700 carbon fiber non-weft cloth, and the non-weft cloth is cut into a disc equal to the inner diameter of the extrusion cylinder. It is made by cross-lamination of punctured carbon cloth in the prior art, the thickness is 15mm, and the volume fraction of the prefabricated body is 40-55%. The preform is deposited pyrolytic carbon coating on the surface of carbon fiber by chemical vapor deposition method, and the deposition parameters are: N2 flux is 0.2m 3 / h, the CH4 feed rate is 20L / h, the deposition temperature is 950°C, and the deposition time is 2 hours.

[0031] First, press the lower sealing block 9 into the bottom of the extrusion cylinder 7, fix the extrusion cylinder 7 on the base 13, fix the preform preheating chamber 4 on the extrusion cylinder 7, and keep the preheating chamber 4 in contact with the extrusion cylinder 7....

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Abstract

The invention discloses a device and a method for separate preheating and one-step infiltration extrusion forming of a magnesium-based composite, and is used for solving the technical problem that a metal-based composite prepared by the traditional vacuum pressure infiltration device is poor in performance. The technical scheme is that the device comprises a prefabricate preheating cavity, an extrusion cylinder, an extrusion cylinder preheating furnace, a prefabricate preheating furnace and a base, wherein the extrusion cylinder is fixed on the base and simultaneously arranged in the extrusion cylinder preheating furnace; the prefabricate preheating cavity is fixed on the extrusion cylinder and simultaneously arranged in the prefabricate preheating furnace, and the prefabricate preheating cavity and the extrusion cylinder are identical in inner diameter and are coaxial. According to the device disclosed by the invention, a mould and a prefabricate are preheated in a separate way, thus the preheating temperature of the prefabricate can be improved, meanwhile, the preheating temperature of the mould is reduced, and thus, the economy and safety of the mould are improved; because a filter screen is arranged in a crucible, the oxidation of carbon fiber and magnesium alloy is prevented, the content of impurities is reduced, and the performance of the composite is improved.

Description

technical field [0001] The invention relates to a magnesium-based composite material forming device, in particular to a magnesium-based composite material split preheating primary impregnation extrusion forming device. It also relates to a separate preheating one-time impregnation extrusion forming method for the magnesium-based composite material using the device. Background technique [0002] Carbon fiber-reinforced magnesium-based composites are metal-based composites with the highest specific strength and stiffness currently available, combining the advantages of carbon fibers and magnesium alloys, with low density and thermal expansion coefficient, good thermal deformation resistance, high damping performance, and dimensional stability Good thermal conductivity and other advantages, it is widely used in aerospace, electronic communication and automobile and other fields. [0003] Among the preparation methods of carbon fiber reinforced magnesium matrix composites, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D23/04C22C101/10
Inventor 齐乐华鞠录岩卫新亮马玉钦周计明
Owner NORTHWESTERN POLYTECHNICAL UNIV
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