Method of melting alloy containing high-vapor-pressure metal

A vapor pressure and metal technology, which is applied in the melting field of alloys containing high vapor pressure metals, can solve the problems of high manufacturing cost, unsuitable for mass production, and pollution of alloy uniformity.

Inactive Publication Date: 2008-02-27
JAPAN METALS & CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because this alloy production method is a production method that does not melt the raw material metal, the above-mentioned problems caused by the appearance of metal fine powder will not occur, but there will be pollution and uniformity of the alloy caused by iron and the like being mixed in from the mill mouth. Lowering and other issues
In addition, there is a problem that it takes a long time to manufacture and the manufacturing cost is high, so it is not suitable for mass production.

Method used

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  • Method of melting alloy containing high-vapor-pressure metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Prepare a total of 1 kg of Mg and Ca metals, so that their molar ratio is 2:1, as the hydrogen-adsorbing alloy CaMg 2 raw materials, put them all into the induction melting type melting furnace, discharge the gas in the furnace to 8×10 -3 Torr, and then, helium gas (concentration 100 vol %) was introduced to 600 Torr as a shielding gas. Thereafter, while filling the furnace with the protective gas, the temperature in the melting furnace was heated to 1100° C. to melt the raw materials, and the molten metal temperature of the alloy was maintained at 1050° C. for 30 minutes. Thereafter, the molten metal of the above alloy is poured onto the water-cooled ingot chassis, and cooled at a cooling rate of 1000°C / sec to solidify the molten metal of the above alloy to produce CaMg 2 alloy. For the CaMg thus obtained 2 For the alloy, the melting yield and chemical composition were measured by the methods (1) and (2) below.

[0033] (1) Determination of melting yield

[0034] ...

Embodiment 2～4

[0044] CaMg was produced in the same manner as in Example 1 above, except that the concentration of helium introduced as a protective gas was changed to 75vol%, 50vol%, and 25vol% (the rest was argon). 2 alloy. Determination of these CaMg by the method of (1) and (2) above 2 The melting yield and chemical composition of the alloy are recorded in Table 1 together with the results. From these results, it can be seen that when the helium concentration exceeds 50 vol% (Examples 2 and 3), the melting yield is as high as about 98%, and the target alloy composition can be obtained with high accuracy. On the other hand, although in the case of a helium concentration of 25vol% (Example 4), the melting yield and alloy composition are worse than those of Examples 1-3, but they are comparable to the case of no helium (Comparative Example 1). Ratio, the melting yield and the accuracy of the alloy composition are improved, and the effect of introducing helium can be confirmed.

[0045] F...

Embodiment 5

[0049] Except adopting Ca and Al as alloy raw materials, all the other manufacture CaAl in the same manner as in Example 1 above. 2 Alloy, with the above (1) and (2) method to measure the obtained CaAl 2 The melting yield and chemical composition of the alloy are recorded in Table 1 together with the results. From the results, it can be seen that in Example 5, a high-precision target alloy with a melt yield as high as about 98% and within ±1% of the target Al composition ratio was obtained.

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Abstract

The present invention provides a method for melting alloys containing high vapor pressure metals, in which alloys containing Mg, Ca, Li, Zn, Mn, Sr, etc., which have low melting points, low boiling points, and high vapor pressures are produced by melting When metal alloys are used, a gas containing helium is used as a protective gas for melting. As a result, an alloy containing a large amount of the target chemical composition of the above-mentioned metal can be manufactured with high precision, safely, and at low cost without incurring danger and pollution such as fire from the evaporated active metal fine powder. In addition, by using a gas containing helium as a shielding gas, since helium has a high thermal conductivity, molten metal can be quenched and solidified, so special alloys can be produced even with ordinary melting equipment.

Description

[0001] Records related to the application [0002] This application is based on Japanese Patent Application No. 2005-56985 filed on March 2, 2005, and claims priority therefrom. technical field [0003] The present invention relates to a melting method for producing alloys containing metals such as Mg, Ca, Li, Zn, Mn, and Sr, which have a low melting point, a low boiling point, and a high vapor pressure by a melting method. Background technique [0004] Because metals represented by Mg, Ca, Zn, and Li, and alloys containing these metals are lighter than transition metals such as iron and their alloys, and have higher specific strength, they are widely used as structural materials and functional materials. expect. Among them, since Mg and Ca are abundantly stored in the earth's crust and seawater, are low in cost, and do not have adverse effects on the human body, there are great expectations for the expansion of the application of Mg and Ca. [0005] However, because metal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D23/00
CPCB22D21/007B22D23/06C22C23/00C22C18/00C22C22/00
Inventor 秋叶悦男榎浩利寺下尚克角挂繁
Owner JAPAN METALS & CHEM CO LTD
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