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Inert atmosphere-based skull melting and casting process adopting consumable titanium alloy electrode

An inert atmosphere, consumable electrode technology, applied in metal material coating process, manufacturing tools, casting equipment, etc., can solve the problems affecting the chemical composition of the casting surface, the melting fluctuation of the alloy composition, affecting the purity of the alloy, etc. Consistency and Purity, Reduction of Reaction, Inhibition of Volatile and Splash

Active Publication Date: 2016-06-01
SHENYANG RES INST OF FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are hundreds of titanium alloys that have been developed in the world. However, if there are alloy elements such as Sn, Al, Mn, Cu, V in the titanium alloy, these elements are easy to volatilize when smelted in a vacuum environment, resulting in the alloy composition before and after smelting. There are large fluctuations, which affect the purity of the alloy
At the same time, when the titanium alloy liquid rushes into the mold, it will slightly react with the surface of the mold, affecting the chemical composition of the casting surface

Method used

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  • Inert atmosphere-based skull melting and casting process adopting consumable titanium alloy electrode

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Alloy raw material: fix the titanium alloy electrode to the electrode rod of the vacuum consumable electrode solidification furnace;

[0020] 2), Furnace loading: put the mold into the vacuum consumable electrode shell solidification furnace;

[0021] 3) Apply positive pressure: first vacuum the furnace body, when the vacuum in the furnace is lower than 10Pa, fill the furnace with argon, and increase the pressure to 700Pa;

[0022] 4) Alloy melting: power transmission, current 18000A, voltage 40V arc melting;

[0023] 5) Casting of the alloy: After melting the alloy raw material to the pouring weight, the titanium alloy liquid is poured into the mold with the plasma sprayed special oxide coating to obtain the titanium alloy casting.

[0024] The composition ratio of raw materials and the obtained casting composition ratio are shown in Table 1.

Embodiment 2

[0026] 1) Alloy raw material: fix the titanium alloy electrode to the electrode rod of the vacuum consumable electrode solidification furnace;

[0027] 2), Furnace loading: put the mold into the vacuum consumable electrode shell solidification furnace;

[0028] 3) Applying positive pressure: first vacuum the furnace body, when the vacuum in the furnace is lower than 10Pa, fill the furnace with argon, and increase the pressure to 9000Pa;

[0029] 4) Alloy melting: power transmission, current 20000A, voltage 40V arc melting;

[0030] 5) Casting of the alloy: After melting the alloy raw material to the pouring weight, the titanium alloy liquid is poured into the mold with the plasma sprayed special oxide coating to obtain the titanium alloy casting.

[0031] The composition ratio of raw materials and the obtained casting composition ratio are shown in Table 1.

Embodiment 3

[0033] 1) Alloy raw material: fix the titanium alloy electrode to the electrode rod of the vacuum consumable electrode solidification furnace;

[0034] 2), Furnace loading: put the mold into the vacuum consumable electrode shell solidification furnace;

[0035] 3) Applying positive pressure: first vacuum the furnace body, when the vacuum in the furnace is lower than 10Pa, fill the furnace with argon, and increase the pressure to 8000Pa;

[0036] 4) Alloy melting: power transmission, current 19000A, voltage 40V arc melting;

[0037] 5) Casting of the alloy: After melting the alloy raw material to the pouring weight, the titanium alloy liquid is poured into the mold with the plasma sprayed special oxide coating to obtain the titanium alloy casting.

[0038] The composition ratio of raw materials and the obtained casting composition ratio are shown in Table 1.

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Abstract

The objective of the invention is to provide an inert atmosphere-based skull melting and casting process adopting a consumable titanium alloy electrode. The process is characterized in that a titanium alloy is melted by virtue of a vacuum consumable titanium alloy electrode under a positive-pressure inert atmosphere, and poured into a casting mould subjected to plasma spraying of special refractory oxides; and a preparation method for the casting mould subjected to the plasma spraying of special refractory oxides comprises the following steps: mixing, in percentage by mass, 20% of yttrium oxide powder, 75% of zirconium oxide powder and 5% of calcium oxide powder, then carrying out ball-milling, carrying out high-temperature sintering by virtue of a high-temperature electric arc smelting method, then preparing 350-mesh powder through nodulizing, granulating and sieving, and spraying the prepared powder on the surface of the casting mould by virtue of plasma spraying equipment. The process is capable of effectively reducing the burning losses of volatile elements in the alloy, improving the consistency of alloy ingredients, reducing the contents of inclusions in the alloy, and improving the purity of an alloy liquid.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy smelting, and in particular provides a casting process of smelting a titanium alloy consumable electrode based on an inert atmosphere, and pouring the smelted alloy into a mold that is plasma-sprayed with a special oxide refractory coating. Background technique [0002] Titanium alloys are widely used due to their high strength, good corrosion resistance, and high heat resistance, such as making aircraft engine compressor components, structural parts of rockets, missiles, and high-speed aircraft, etc. At present, there are hundreds of titanium alloys that have been developed in the world. However, if there are alloy elements such as Sn, Al, Mn, Cu, V in the titanium alloy, these elements are easy to volatilize when smelted in a vacuum environment, resulting in the alloy composition before and after smelting. There are large fluctuations, which affect the purity of the alloy. At the same ti...

Claims

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Application Information

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IPC IPC(8): B22D35/06C22B9/16C23C4/12C23C4/10B22C23/02B22C3/00
CPCY02T50/60
Inventor 娄延春赵军刘时兵史昆刘宏宇刘鸿羽张有为陈晓明
Owner SHENYANG RES INST OF FOUNDRY
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