Preparation method of alumina fiber reinforced magnesium-matrix composite

A technology of alumina fiber and composite materials, applied in the field of composite materials, can solve the problems of poor high-temperature creep resistance and low mechanical properties, and achieve the effects of improved creep performance, uniform distribution, and good wettability

Inactive Publication Date: 2011-09-21
XIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Magnesium alloy has the characteristics of low density, high specific strength, high specific stiffness, and stable size. It also has the advantages of good filling flow performance and abundant resources. It is known as the most promising "green" engineering material in the 21st century. However, the existing The magnesium-based alloys produced by the technology have low mechanical properties and poor high-temperature creep resistance, which limits their application.

Method used

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  • Preparation method of alumina fiber reinforced magnesium-matrix composite
  • Preparation method of alumina fiber reinforced magnesium-matrix composite
  • Preparation method of alumina fiber reinforced magnesium-matrix composite

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preparation example Construction

[0059] The preparation of the composite material is completed by the pressureless infiltration method. The preparation process is carried out in a vacuum molybdenum wire furnace. First, the fiber prefabricated body shape prepared in step 4 is placed on the bottom of the crucible, and the infiltration alloy that has been polished to remove the scale is placed in the crucible. Put the crucible into the vacuum molybdenum wire furnace on the upper surface of the fiber prefabricated body, and evacuate to 4.9×10 -2 Pa-5.1×10 -2 Pa; then under an argon protective atmosphere, heat the vacuum molybdenum wire furnace to 660°C ± 2°C for 90 minutes, and finally cool to 430°C ± 2°C with the furnace, take out the crucible, and obtain the alumina fiber reinforced magnesium matrix composite material.

[0060] The impregnation alloy is selected from Mg-9Al-0.5Nd, Mg-8Al-0.5Nd or Mg-6Al-0.5Nd series alloys.

[0061] The working principle of the method of the present invention is that the alumi...

Embodiment 1

[0063] Step 1. Determine and weigh each component

[0064] If the fiber preform height h =100 mm, bottom diameter D=48 mm, need to weigh Al 2 o 3 Fiber 119.4 grams (mass percentage is 74%), volume fraction is 20%, graphite powder 32.3 grams (mass percentage is 20%), silica sol 9.7 grams (mass percentage is 6%), total mass 161.4 grams (mass percentage is 100% %). Among them, graphite powder particle size ≤ 30μm, purity ≥ 99.85%; SiO in silica sol 2 The content is 25%.

[0065] Step 2, preparing fiber pulp

[0066] 119.4 grams of Al weighed in the previous step 2 o 3 Put the fiber into a glass container, first add 30ml of alcohol, stir until the fiber is loose and wet, then add 32.3 grams of graphite powder weighed in the previous step, continue stirring for 2 minutes, then add 30ml of alcohol, and then add 10ml of alcohol every 2 minutes , the total amount of alcohol does not exceed 100ml, when Al 2 o 3 When the fiber and the graphite powder are mixed evenly and becom...

Embodiment 2

[0074] Step 1. Determine and weigh each component

[0075] If the fiber preform height h =100 mm, bottom diameter D=48 mm, need to weigh Al 2 o 3 Fiber 124.2 grams (mass percentage is 77%), volume fraction is 18%, graphite powder 24.2 grams (mass percentage is 15%), silica sol 12.9 grams (mass percentage is 8%), total mass 161.4 grams (mass percentage is 100 %). Among them, graphite powder particle size ≤ 30μm, purity ≥ 99.85%; SiO in silica sol 2 The content is 25%.

[0076] Step 2, preparing fiber pulp

[0077] 124.2 grams of Al weighed in the previous step 2 o 3 Put the fiber into a glass container, first add 30ml of alcohol, stir until the fiber is loose and wet, then add 24.2 grams of graphite powder weighed in the previous step, continue stirring for 2 minutes, then add 30ml of alcohol, and then add 10ml of alcohol every 2 minutes , the total amount of alcohol does not exceed 100ml, when Al 2 o 3 When the fiber and the graphite powder are uniformly mixed and be...

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Abstract

The invention discloses a preparation method of an alumina fiber reinforced magnesium-matrix composite. The method comprises the following steps: 1) determining the content of each component in fiber perform mixture containing Al2O3 fiber, graphite powder and silica sol; 2) preparing fiber paste; 3) performing mould pressing to obtain a wet fiber perform; 4) drying and roasting the wet fiber perform to obtain a fiber perform part; and 5) placing the fiber perform part at the bottom of a crucible, placing permeating alloy which is polished to remove oxide scales on the fiber perform part, placing the crucible in a vacuum molybdenum wire resistance furnace, vacuumizing; and then permeating under the protective atmosphere of argon, and finally cooling the material with the furnace to obtain the composite. By adopting the method disclosed by the invention, the alumina fiber reinforced magnesium-matrix composite with uniform Al2O3 fiber distribution, compact structure and higher creep property is obtained.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a preparation method of alumina fiber reinforced magnesium-based composite materials. Background technique [0002] In today's world, resource recycling and environmental protection have become the primary issues for sustainable economic development and human survival. In order to reduce energy consumption and reduce air pollution caused by vehicle exhaust, the use of lightweight materials to reduce vehicle weight has become a major issue in the world's major automobiles. At the same time, with the sharp increase in the consumption of metal materials, the rapid development of science and technology, the emergence and widespread use of large-scale production processes, the limited resources on the earth are becoming increasingly poor. Therefore, the research and development of new lightweight alloy materials has been paid more and more attention by various countries. As ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C47/06C22C47/08C22C49/04C22C101/04C22C121/00
Inventor 王武孝杨建东关蕾徐锦锋亢春生
Owner XIAN UNIV OF TECH
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