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Vacuum suction casting equipment and method of high-activity, high-purity and high-melting-point alloy

A vacuum suction casting, high-purity technology, applied in the field of metal material casting metallurgy, can solve the problems of metal type suction casting not suitable for high temperature structure, easy pollution success rate, etc., achieve the effect of short melting time, simple equipment structure and convenient operation

Inactive Publication Date: 2012-12-19
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a pollution-free suction casting equipment for high-activity, high-purity and high-melting point alloys, so as to solve the inapplicability of metal mold suction casting in the prior art. For active high-melting point alloys such as high-temperature structures, intermetallic compounds, and titanium alloys, there are problems such as easy pollution or low success rate during suction casting

Method used

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  • Vacuum suction casting equipment and method of high-activity, high-purity and high-melting-point alloy

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Embodiment 1

[0038] Put 20-300g of the prepared master alloy ingot 8 into the alloy ingot crucible 4, place the mold 6 in the vacuum chamber 2 directly below it, make the through hole 5 communicate with the upper vacuum chamber and the lower vacuum chamber; close the vacuum chamber 1 and the lower vacuum chamber 2, and simultaneously evacuate to 2×10 -2 Above Pa, then filled with high-purity argon to P 1 Turn on the water circulation 7, turn on the arc torch 9 for argon arc smelting, when the surface layer of the master alloy ingot 8 is completely melted, the through hole 5 will be automatically liquid-sealed to separate the upper vacuum chamber and the lower vacuum chamber; at this time, keep the power of the arc torch unchanged, Continue to fill the vacuum chamber 1 with high-purity argon to P 2 , form the upper and lower pressure difference △P= P 2 -P 1, to ensure that △P is greater than zero; after that, continue to increase the melting power of the arc torch. After a few minutes, t...

Embodiment 2

[0040] According to the mass ratio of the alloy components and the law of burning loss compensation, a 10-100g TiAl alloy package is prepared by using high-purity raw materials in a certain proportion, which is placed in a copper crucible 3 and vacuumed to 5×10 -3 Above Pa, then inject high-purity argon gas with a pressure of 0.02-0.06 MPa; perform low-current arcing under visual conditions, and gradually increase the melting current to avoid splashing of raw materials; melt the alloy package evenly and thoroughly with the assistance of electromagnetic stirring , and the arc is closed and solidified into a master alloy ingot; then it is turned over and smelted, and this process is repeated 3-10 times, thereby obtaining a master alloy ingot 8 with high purity, high uniformity and high precision, such as figure 2 As shown, it can be seen from the figure that the prepared master alloy ingot has a smooth surface and good uniformity. After testing, it has high purity and few impuri...

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Abstract

The invention discloses vacuum suction casting equipment and a method of high-activity, high-purity and high-melting-point alloy. The equipment comprises an upper vacuum chamber and a lower vacuum chamber which are arranged up and down; an electric arc gun is arranged at the top end of the upper vacuum chamber; a plurality of station copper crucibles are arranged at the bottom end to tightly separate the upper vacuum chamber and the lower vacuum chamber; the peripheries of the copper crucibles are cooled by circulating water; an alloy ingot crucible is tightly matched and embedded in one station copper crucible; a through hole is preserved at the bottom, and the upper vacuum chamber and the lower vacuum chamber are communicated. Nozzles such as graphite and the like are replaced by a high-melting-point alloy ingot which has good conduction performance and large heat capacity and comprises a hole at the bottom, and embedded into the copper crucibles to form an indirect water cooling structure. Automatic suction casting is carried out by combining with a differential-pressure method; the problems of pollution and low success ratio of the alloy in the existing suction casting equipment are solved; the clean suction casting process of the alloy is effectively achieved; the melting point of the suction casting alloy can be up to 1600-1800 DEG C, and the pollution degree is smaller than or equal to 0.01wt %.

Description

technical field [0001] The invention relates to the field of casting and metallurgy of metal materials, in particular to a vacuum suction casting equipment and method for alloys with high activity, high purity and high melting point. Background technique [0002] Materials such as high-temperature structures, intermetallic compounds, and titanium alloys have broad application prospects in the fields of energy, medical care, and aerospace. Most of them have the characteristics of high purity, high activity and high melting point, so ingot metallurgy and precision casting of such alloys have become the difficulties and hot spots of applied research. Differential pressure suction casting is a mature and commonly used forming technology, but currently it is mainly aimed at low melting point alloys and amorphous alloys below 1300 °C. As far as the existing mature suction casting equipment is concerned, no matter whether it is gravity suction casting, anti-gravity suction casting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D18/06
Inventor 刘荣华崔玉友张德志谭景全刘冬刘羽寅杨锐
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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