Device and method for producing integrated magnesium base composite material

A composite material and preparation device technology, which is applied in the field of integrated magnesium-based composite material preparation devices, can solve problems such as easy oxidation, reduced performance of parts, and difficult quantitative pouring of magnesium alloy liquid, so as to avoid oxidative combustion and improve performance. Effect

Inactive Publication Date: 2008-07-16
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The prior art has the following deficiencies: the forming process of magnesium-based composite materials needs to be carried out in separate devices and steps, the device is complicated, and there are many operating steps; it is difficult to realize the quantitative pouring of magnesium alloy liquid in the vacuum liquid infiltration process; During extrusion, the magnesium-based composite billet is exposed to the air for a long time, which is prone to oxidation. In addition, due to the difference in deformation resistance and expansion coefficient between the strengthening phase and the matrix, it is difficult to coordinate. Secondary heating and solid-state deformation may affect its bonding interface. reduce part performance

Method used

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  • Device and method for producing integrated magnesium base composite material
  • Device and method for producing integrated magnesium base composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Example 1. Refer to Figure 1. The metal substrate used in this example is AZ91D magnesium alloy, and the preform is aluminum borate whisker produced by Luoyang Refractory Research Institute. The size of the preform is 45×30mm, and the aluminum borate whisker preform is prepared by wet method.

[0029] The device of the present invention comprises a smelting device and an extrusion molding device, the smelting device communicates with the die cavity of the die barrel 19 of the extrusion molding device through a three-way liquid inlet pipe 14, and the third end of the three-way liquid inlet pipe 14 passes through the D The valve 12 is connected with the pressure tank 4, the mold cavity of the die barrel 19 is communicated with the vacuum pump 1 through a pipeline, and the melting chamber 16 is also connected with the pressure tank 4 and the vacuum pump 1 through a pipeline respectively. The liquid level sensor 13 is connected with the crucible cover 15 by a self-sealing...

Embodiment 2

[0032] Example 2. The aluminum borate whisker prefabricated body is coated, and the aluminum oxide coating is prepared on the surface of the aluminum borate whisker by using the sol-gel method, so as to achieve the purpose of modifying the whisker surface.

[0033] Steps: (1) Place the prepared alumina-coated aluminum borate whisker prefabricated body in the die barrel 19, place the AZ91D magnesium alloy ingot in the crucible melting chamber 16, connect the device and the circuit, and place the The die barrel 19 and the crucible 6 are sealed;

[0034] (2) Close A valve 2 and B valve 3, close C valve 11, open D valve 12, feed Ar gas, and control the gas pressure at 0.2-0.9 MPa;

[0035] (3) Start the temperature control system, A resistance heater 5 is heated for 2 to 5 hours to keep the crucible temperature at 600 to 850°C, B resistance heater 20 is heated for 1 to 2 hours to control the temperature of the preform and the forming mold at The temperature is 400-700°C, so that...

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Abstract

The invention discloses a preparation device of integral magnesium matrix composite, which consists of a melting device and a squeezing device. The invention is characterized in that the concave mode barrel and the forming die bottom exit of the squeezing device are sealed in ejector pins; the upper end port of the concave barrel is sealed in cushion block to form a sealed cavity. The melting cavity of the melting device and the mould cavity of squeezing device are communicated through feed liquor of a three-way pipe; the third end of the three-way liquid inlet pipe is communicated with the vacuum pump through pipes; the liquid level sensor is inserted into the cavity of the melting cavity and connected with the cap of crucible lid by adopting self-sealing thread. By adopting the design of the preparation device of the integral magnesium matrix composite, the invention processes the required magnesium alloy for preparation magnesium matrix composite by the four steps melting, pouring, impregnating and extrusion forming in a totally closed integral device.

Description

technical field [0001] The invention relates to an integrated magnesium-based composite material preparation device, and also relates to a method for preparing magnesium-based composite materials using the device. Background technique [0002] Magnesium-based composites have low density, high specific strength, high specific modulus, excellent damping and vibration reduction properties, low thermal expansion coefficient, and excellent casting properties. They are lightweight and high-performance structural materials. [0003] The preparation of magnesium-based composite materials by vacuum infiltration method is to first vacuumize the whisker preform to be in a vacuum state, and then the liquid magnesium alloy is infiltrated into the preform under the negative pressure caused by the vacuum. [0004] Refer to Figures 2-4. The document "Interfacial characteristics of impregnated / extruded (SiCw+B4Cp) / Mg(AZ91) composite materials, Jintounan, Nie Zuoren, Li Douxing. Chinese Jour...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D23/04B22D21/04
Inventor 齐乐华苏力争欧阳海波周计明王振军
Owner NORTHWESTERN POLYTECHNICAL UNIV
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