Manufacturing method of a magnesium group composite material

a composite material and manufacturing method technology, applied in the field of magnesium composite powder, can solve the problems of demerits of magnesium alloy, low rigidity, low hardness, etc., and achieve the effects of high economic efficiency, high mechanical characteristics, and superior characteristics

Inactive Publication Date: 2008-09-04
KONDOH KATSUYOSHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0017]It is still another object of the present invention to provide a method of manufacturing the above magnesium group composite material with high economical efficiency.
[0018]It is still another object of the present invention to provide a method of manufacturing the magnesium composite powder as the starting raw material for the above magnesium group composite material with high efficiency.
[0020]According to the present invention, the fine-grained powder is attached on a surface of the magnesium alloy coarse particle which is the main component. As the particle diameter of the fine-grained powder is about 1 / 10 to 1 / 1000 of the magnesium alloy coarse particle, the fine-grained powder is considerably fine as compared with the magnesium alloy coarse particle. While the magnesium composite powder in which the fine-grained powder is attached on the surface of the magnesium alloy coarse particle is pressed, solidified and heated, compound particles are formed by a solid-phase reaction synthesis in the course of heating the solidified body. According to the present invention, the magnesium group composite material having superior characteristics is manufactured with high economical efficiency by dispersing the above compound particles in the matrix.
[0021]The inventor of the present invention resulted in providing the magnesium group composite material having high mechanical characteristics such as high strength, high hardness, and high rigidity, superior abrasion resistance and low friction coefficient at the time of frictional sliding through various kinds of experiments and studies.

Problems solved by technology

Meanwhile, the magnesium alloy has demerits such as low hardness, low rigidity, low abrasion resistance and low corrosion resistance.
As a result, a prominent increase in strength is not provided in the finally manufactured magnesium group composite material.
Meanwhile, since the enlarged magnesium silicide particle causes a crack to be generated or spread, it lowers toughness of the material.
In view of such danger, it is very difficult to use the fine magnesium alloy powder as the starting material in practice.
As described above, there are following problems when the fine silicon particles are used as the starting raw material, that is,

Method used

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  • Manufacturing method of a magnesium group composite material
  • Manufacturing method of a magnesium group composite material
  • Manufacturing method of a magnesium group composite material

Examples

Experimental program
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Effect test

working example 1

(1) Working Example 1

[0104]As a starting raw material to constitute a matrix to manufacture the magnesium alloy, AZ31 magnesium alloy coarse particle powder having a maximum particle diameter of 1.5 mm, a minimum particle diameter of 550 μm and an average particle diameter of 870 μm was prepared. Meanwhile, as the added powder, fine-grained powder of silicon (Si), silica (SiO2), γ alumina (Al2O3) and aluminum (Al) were prepared. Particle diameters (maximum, average, minimum) of the above powder measured by laser diffraction and scattering method are shown in a table 1.

TABLE 1SiliconSilicaγaluminaAluminumFine-grained powder(Si)(SiO2)(Al2O3)(Al)Maximum value (μm)55483844Average value (μm)22201423Minimum value (μm)4359

[0105]The AZ31 coarse particle powder and each fine-grained powder were weighed and mixed so that 5% by weight of the fine-grained powder might be contained. As a binder solution, PVA (polyvinyl alcohol) water solution having a concentration of 2% was prepared.

[0106]Each ...

working example 2

(2) Working Example 2

[0109]As a starting raw material to constitute a matrix to manufacture the magnesium alloy, AZ91 magnesium alloy coarse particle chip having a maximum particle diameter of 4.6 mm, a minimum particle diameter of 680 μm and an average particle diameter of 3.8 mm and manufactured by cutting processing was prepared. Meanwhile, as the added powder, the silicon (Si) powder shown in the working example 1 was prepared.

[0110]The AZ91 coarse particle chip and the Si fine-grained powder were weighed so that 95% by weight of the AZ91 coarse particle chip and 5% by weight of the Si fine-grained powder might be provided. As a binder solution, the PVP (polyvinyl pyrrolidone) water solutions having concentrations shown in a table 3 were prepared to which the weighed Si fine-grained powder was mixed. In addition, 20% by weight of the PVP water solution was provided in the whole mixed powder.

TABLE 3PVP water solutionPVA solidAttached state of SiNo.concentration (%)quantity (%)fin...

working example 3

(3) Working Example 3

[0114]The AZ91 magnesium alloy coarse particle chip used in the working example 2 and the silica (SiO2) fine-grained powder shown in the working example 1 were prepared. The AZ91 coarse particle chip and the silica fine-grained powder were weighed and mixed so that 70% by weight of the coarse particle chip and 30% by weight of the silica fine-grained powder might be provided. The mixture was mechanically granulated using a vertical type of roller compactor. In addition, a roller had a configuration of a toothed wheel here. A speed of the roller at a peripheral part was set at 10 mm / sec and a load between the toothed wheels was set at about 10 Kgf. Result of appearance of provided granulated object observed by a scanning electronic microscope is shown in FIG. 13.

[0115]As shown in FIG. 13, the granules provided by the roller compactor were the magnesium composite powder in which the silica fine-grained powder was mechanically and uniformly attached on the AZ91 chi...

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Abstract

Magnesium composite powder which is a starting raw material to manufacture a particle-dispersion type of magnesium group composite material comprises magnesium alloy coarse particles (7) serving as a main component which constitutes a matrix of a magnesium alloy and fine-grained powder (8) comprising a component which reacts with magnesium to form a compound and attached on a surface of the magnesium alloy coarse particle (7) through a binder (9).

Description

TECHNICAL FIELD[0001]The present invention relates to magnesium composite powder which is a starting raw material to manufacture a particle-dispersion type of magnesium group composite material by solid-phase reaction synthesis, its manufacturing method, a magnesium group composite material using the composite powder and its manufacturing method.BACKGROUND ART[0002]A magnesium alloy is known as a most lightweight material and serves many uses. Meanwhile, the magnesium alloy has demerits such as low hardness, low rigidity, low abrasion resistance and low corrosion resistance.[0003]Therefore, conventionally, as a method to improve mechanical characteristics of the magnesium alloy, a particle-dispersion type of magnesium group composite material in which second-phase particles are dispersed in a matrix has been studied. Especially, research and development regarding a magnesium group composite material in which magnesium silicide (Mg2Si) particles having a light weight, high hardness, ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B22F3/12B22F3/24B22F1/148C22C1/05
CPCC22C1/05B22F1/0096B22F1/148
Inventor KONDOH, KATSUYOSHI
Owner KONDOH KATSUYOSHI
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