Magnesium base composite material

a composite material and magnesium base technology, applied in the direction of metal silicides, etc., can solve the problems of increasing energy consumption and cost, and achieve the effect of improving mechanical properties, improving mechanical properties, and improving the reaction between mg and si

Inactive Publication Date: 2005-01-27
TOUDAITLO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010] Furthermore, in addition to the above-mentioned objects, it is yet another object of the present invention to provide a Mg-base composite material having improved mechanical properties, such as, in particular, strength and hardness, and rigidity (Young's Modulus) if necessary as well as corrosion resistance, and a manufacturing method thereof.
[0011] After extensive research efforts, the present inventors have found that it is possible to achieve the above-mentioned objects by using a manufacturing method of a magnesium-base composite material based on a powder metallurgical method without depending on the conventional cast-dissolving method.
[0012] In one aspect of the present invention, the present inventors have found that, during a process of press-forming mixed powder of matrix powder containing Mg and Si powder, an oxidized coat film (MgO) on the Mg-powder surface is mechanically broken and separated to form active Mg newly-generated faces so that the contact area to the Si powder is increased to allow the reaction between the two materials to progress in a solid-phase temperature range of not more than the melting point of Mg. On the basis of this knowledge, they have found that, by dispersing Si powder in the surface and / or the inside of the matrix powder containing Mg, it is possible to form a state where the Si powder and the matrix powder containing Mg are made in closely contact with each other without MgO being located therebetween and, consequently, to allow the reaction between Mg and Si to progress easily.
[0013] Moreover, the present inventors have found that the product obtained from the above-mentioned reaction in a solid-phase temperature range not more than the melting point of Mg is further subjected to a warm plasticization treatment, so that it becomes possible to provide an Mg-base composite material having improved mechanical properties, such as, in particular, strength and hardness, and rigidity (Young's Modulus) if necessary as well as corrosion resistance.

Problems solved by technology

Moreover, the above-mentioned manufacturing methods based on the dissolving method are inevitably susceptible to an increase in energy consumption, resulting in problems with costs.

Method used

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Examples

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example 1

[0254] As starting materials, 90 parts by weight of pure Mg powder (average particle size: 112 μm) and 10 parts by weight of Si powder (average particle size: 64 μm) were prepared. After blending these, the resulting material was evenly mixed by a ball mill to obtain mixed powder. A circular metal mold having a diameter of 34 mm was filled with the resulting mixed powder, and a load having a face pressure of 2 to 7 t / Cm2 was applied thereto, thereby forming compressed powder molded bodies A-1 to A-7.

[0255] In a separated manner from the compressed powder molded bodies A-1 to A-7, the following tubular furnace was prepared. In other words, the tubular furnace in which nitrogen gas (gas flow rate: 3 dm3 / min) was allowed to flow, with the inner temperature thereof being controlled to 580° C., was prepared. Each of the compressed powder molded bodies A-1 to A-7, obtained as described above, was inserted into the tubular furnace, and after having been heated and maintained for 15 minute...

example 2

[0267] As starting materials, 85 parts by weight of AZ91D magnesium alloy powder (average particle size: 61 μm; nominal composition: Mg-9A1-1Zn / mass %) and 15 parts by weight of Si powder (average particle size: 64 μm) were prepared. After blending these, the resulting material was evenly mixed by a ball mill to obtain mixed powder. A circular metal mold having a diameter of 11.3 mm was filled with the resulting mixed powder, and a load having a face pressure of 5 t / cm2 was applied thereto, thereby forming a compressed powder molded body A-8. The void content thereof was measured to find that it showed 12.3%, which satisfied the range defined by the present invention.

[0268] The compressed powder molded body A-8, obtained as described above, was inserted into a tubular furnace through which nitrogen gas (gas flow rate: 2 dm3 / min) was allowed to flow, and after having been heated at the respective heating temperatures shown in Table 2 for 30 minutes, and maintained, this was cooled t...

example 3

[0271] Pure Mg powder (average particle size: 112 μm) and Si powder (average particle size: 64 μm) were prepared as starting materials, and the two materials were mixed so as to have a blended composition as shown in Table 3, thereby obtaining mixed powder. A circular metal mold having a diameter of 11.3 mm was filled with the resulting mixed powder, and a load having a face pressure of 6 t / cm2 was applied thereto, thereby forming green compact molded bodies A-9 to A-15 The void contents of these molded bodies A-9 to A-15 were measured to obtain values of 8.9 to 11%, each of which satisfies the range defined by the present invention.

[0272] Each of the compressed powder molded bodies A-9 to A-15, obtained as described above, was inserted into a tubular furnace through which nitrogen gas (gas flow rate: 2 dm3 / min) was allowed to flow, with the temperature inside thereof being controlled to 580° C., and after having been heated and maintained for 15 minutes, this was cooled to normal ...

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Abstract

The present invention provides a magnesium-base composite material capable of suppressing coarse growth of a crystal particle size of a magnesium matrix and Mg2Si particles, thereby providing excellent mechanical properties such as strength and hardness, and a manufacturing method thereof. The manufacturing method includes the steps of: blending matrix powder containing Mg and Si powder to obtain a blended matter; applying a plasticization treatment to the resulting blended matter to form a solid body; heating the solid body to allow Mg and Si to react with each other to form a heat solid body containing Mg2Si; and applying a warm plasticization treatment to the heat solid body. Thus, it is possible to provide a magnesium-base composite material having a tensile strength from not less than 100 MPa to not more than 500 MPa.

Description

TECHNICAL FIELD [0001] The present invention relates to a magnesium-base composite material having excellent mechanical properties, such as high tensile strength and high hardness, and high rigidity if desired, as well as excellent corrosion resistance, and a manufacturing method thereof. BACKGROUND ART [0002] Conventionally, with respect to a magnesium-base composite material in which magnesium silicide (Mg2Si) grains are dispersed, various studies and researches have been vigorously conducted. For example, Japanese Patent Laying-Open No. 6-81068 has disclosed a manufacturing method of a magnesium-base composite material in which upon injection-molding magnesium alloy containing a large amount of Si component in a semi-molten state, an Mg matrix and Si are allowed to react with each other to synthesize Mg2Si and these Mg2Si grains are dispersed. [0003] Moreover, Japanese Patent Laying-Open No. 8-41564 has disclosed a magnesium-base composite material obtained by a casting method in...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C01B33/06C22C29/18C22C32/00
CPCB22F2003/248B22F2998/10C22C32/0078C22C29/18B22F2999/00C01B33/06C04B35/58085C04B35/6261C04B2235/3206C04B2235/3418C04B2235/3891C04B2235/401C04B2235/428C04B2235/604C04B2235/608C04B2235/80C04B2235/9684B22F1/0003B22F3/16B22F3/1208B22F3/10B22F3/14B22F3/17B22F3/20B22F3/24B22F1/12
Inventor KONDOH, KATSUYOSHIAIZAWA, TATSUHIKOOGINUMA, HIDEKIYUASA, FIJI
Owner TOUDAITLO LTD
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