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Non-pollution directional solidification method of high-niobium titanium aluminum intermetallic compound

An intermetallic compound and directional solidification technology is applied in the field of high-niobium-titanium-aluminum intermetallic compound materials, which can solve the problems affecting the performance of high-niobium-titanium-aluminum alloy, the performance degradation of high-niobium-titanium-aluminum alloy, and the pollution of high-niobium-titanium-aluminum alloy. Achieve the effect of low cost, improved tensile strength and high unidirectional performance

Active Publication Date: 2013-02-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem in the prior art that the microstructure control of high-niobium titanium-aluminum alloys is mainly carried out in ceramic tubes, and the ceramic tubes pollute high-niobium titanium-aluminum alloys, resulting in a decrease in the performance of high-niobium titanium-aluminum alloys. Also in order to solve the problem of insufficient superheat in the prior art when melting high niobium titanium aluminum alloy, which affects the performance of high niobium titanium aluminum alloy, and then provides a pollution-free directional solidification method of high niobium titanium aluminum intermetallic compound

Method used

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  • Non-pollution directional solidification method of high-niobium titanium aluminum intermetallic compound

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specific Embodiment approach 1

[0019] Specific implementation mode one: combine Figure 1~5 To illustrate this embodiment, the pollution-free directional solidification method of a high-niobium-titanium-aluminum intermetallic compound described in this embodiment is realized through the following steps:

[0020] A. Electromagnetic induction heating process:

[0021] Step A1, the upper end surface of the high-niobium titanium-aluminum alloy base 7 is set at a distance of 53 mm to 55 mm from the upper end surface of the electromagnetic copper crucible 8, and the raw material rod 26 is hung above the electromagnetic copper crucible 8 through the feeding rod 22, and extended into the inside of the crucible 43 ~45mm;

[0022] Step A2, using the vacuum pump 3 to evacuate the vacuum chamber 2 equipped with the electromagnetic copper crucible 8, so that the vacuum degree of the vacuum chamber 2 is 0.8Pa~1.0Pa;

[0023] Step A3, filling the vacuum chamber 2 with argon gas of 350-400 Pa;

[0024] Step A4, pass sin...

specific Embodiment approach 2

[0032] Embodiment 2: In this embodiment, in step A4, the initial power supply is controlled to be 42kW. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0033] Specific implementation mode three: In this implementation mode, in step B2, after the hump height in the electromagnetic copper crucible 8 reaches 13 to 18 mm, the temperature is kept for 8 to 10 minutes. After heat preservation, the temperature field of the melt can have a certain degree of superheat and reach the initial steady state, and the volume of the hump can also be stabilized. Other steps are the same as those in Embodiment 1 or 2.

[0034] Carry out following elaboration again for the inventive method:

[0035] The method of the present invention is realized by three processes of induction heating, electromagnetic confinement and columnar crystal growth; in terms of induction heating, the high-niobium titanium aluminum alloy base and feeding rod are heated by electromagnetic induction until melting; in terms of electromagnetic confinement, the high-frequency magnetic field induces the raw materials Melting and forming a hump, the height of the hump is control...

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Abstract

The invention discloses a non-pollution directional solidification method of a high-niobium titanium aluminum intermetallic compound and belongs to the technical field of high-niobium titanium aluminum intermetallic compound materials. The invention solves the problem in the prior art that the high-niobium titanium aluminum alloy is polluted and the dimension is small to reduce the performance of the high-niobium titanium aluminum alloy, and a problem of insufficient superheat degree of smelting the high-niobium titanium aluminum alloy affecting the performance of the high-niobium titanium aluminum alloy further exists in the prior art. The method comprises the following steps of: smelting the upper segment of a pedestal in an electromagnetic red copper crucible and the lower end of a feeding bar through an induction coil; after fused high-niobium titanium aluminum alloy liquid in the electromagnetic red copper crucible forms a hum, driving a pull rod to move downwards, a feeding motor is started, the feeding bar adds materials in the electromagnetic red copper crucible, a cooler provides strong cold to the smelted high-niobium titanium aluminum alloy to form the smelted high-niobium titanium aluminum alloy liquid to columnar crystals with directional solidification tissues; and processing and removing the polycrystalline layer of the columnar crystal high-niobium titanium aluminum alloy ingot to form a high-niobium titanium aluminum alloy ingot with directional solidification. The non-pollution directional solidification method provided by the invention is used for preparing columnar crystal high-niobium titanium aluminum alloy ingots.

Description

technical field [0001] The invention relates to a method for directional solidification of a high-niobium-titanium-aluminum alloy, which is a high-melting-point high-activity alloy, and belongs to the technical field of high-niobium-titanium-aluminum intermetallic compound materials. Background technique [0002] In order to improve the room temperature plasticity and high temperature oxidation resistance of TiAl alloys, people have carried out a lot of research, the most notable of which is the TiAl or Ti 3 Adding high content and high melting point transition group element Nb to Al, the addition of Nb element is one of the most effective means to improve the room temperature ductility and high temperature oxidation resistance of TiAl alloys. Because the amount of Nb added is not a small amount, it is named as high-niobium titanium-aluminum-based alloy (or high-temperature titanium-aluminum-based alloy, and the mass percentage of niobium is more than 6%). The melting point...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/02
Inventor 陈瑞润杨劼人丁宏升郭景杰苏彦庆傅恒志
Owner HARBIN INST OF TECH
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