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A kind of preparation method of high niobium titanium alloy homogeneous casting ingot

A niobium-titanium alloy and ingot casting technology is applied in the field of preparation of high-niobium-titanium alloy homogeneous ingots, which can solve the problems of decreased electrode strength, difficulty in crushing and high price, achieve uniform distribution of alloy components, achieve uniform distribution, and avoid niobium the effect of falling

Active Publication Date: 2020-10-02
西安赛特思迈钛业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, niobium rods and titanium sponge are used to press electrodes, or niobium rods are used as the core of consumable electrodes, titanium sponge electrodes are welded to niobium rods, and alloy ingots are prepared by multiple vacuum consumable arc melting. process, the alloy ingots prepared in this way are prone to niobium infusible lumps
In addition, there is also a vacuum consumable arc melting process using niobium metal powder as a raw material mixed with titanium sponge, but a large amount of powder is added to titanium sponge, which significantly reduces the electrode strength, and the melting current is higher than that of conventional titanium alloys, which is easy to cause electrode damage. Fracture occurs during the smelting process, which directly affects the quality of the ingot
If niobium-titanium metal is prepared by condensed shell smelting, not only the preparation process is complicated, the price is high, and it is difficult to break

Method used

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  • A kind of preparation method of high niobium titanium alloy homogeneous casting ingot

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment includes the following steps:

[0026] Step 1. Crushing 9.4kg of niobium chips to obtain niobium chips with a particle size of less than 3mm, and then put them into a vacuum annealing furnace. -2 Under the condition of MPa, heat to 800°C and hold for 30 minutes for vacuum annealing;

[0027] Step 2, mechanically mixing the niobium chips after the vacuum annealing treatment in step 1 and 3.13 kg of grade 0 sponge titanium with a particle size of 3 mm to 12.7 mm for 5 minutes to obtain a mixture;

[0028] Step 3. The mixture obtained in step 2 is used as the middle layer, 3.735 kg of grade 0 sponge titanium with a particle size of 3 mm to 12.7 mm is used as the lower layer, and 3.735 kg of grade 0 titanium sponge with a particle size of 3 mm to 12.7 mm is used as the upper layer in the mold. Cloth, and then carry out pressing treatment, obtain electrode block;

[0029] Step 4, performing plasma arc welding on 25 electrode blocks obtained in step 3 to obt...

Embodiment 2

[0034] This embodiment includes the following steps:

[0035] Step 1. Crushing 25kg of niobium chips to obtain niobium chips with a particle size of less than 3mm, and then put them into a vacuum annealing furnace. -2 Under the condition of MPa, heat to 850°C and hold for 40 minutes for vacuum annealing;

[0036]Step 2, mechanically mixing the niobium chips after the vacuum annealing treatment in step 1 and 8.34 kg of titanium sponge with a particle size of 3 mm to 12.7 mm for 8 minutes to obtain a mixture;

[0037] Step 3, use the mixture obtained in step 2 as the middle layer, 8.33kg of grade 0 sponge titanium with a particle size of 3mm to 12.7mm as the lower layer, and 8.33kg of grade 0 titanium sponge with a particle size of 3mm to 12.7mm as the upper layer in the mold Cloth, and then carry out pressing treatment, obtain electrode block;

[0038] Step 4, performing plasma arc welding on 20 electrode blocks obtained in step 3 to obtain electrode rods;

[0039] Step 5. T...

Embodiment 3

[0043] This embodiment includes the following steps:

[0044] Step 1. Crushing 8kg of niobium chips to obtain niobium chips with a particle size of less than 3mm, and then put them into a vacuum annealing furnace. -2 Under the condition of MPa, heat to 830°C and hold for 35 minutes for vacuum annealing;

[0045] Step 2, mechanically mixing the niobium chips after the vacuum annealing treatment in step 1 and 4 kg of grade 0 titanium sponge with a particle size of 3 mm to 12.7 mm for 8 minutes to obtain a mixture;

[0046] Step 3, using the mixture obtained in step 2 as the middle layer, 4kg of grade 0 sponge titanium with a particle size of 3mm to 12.7mm as the lower layer, and 4kg of grade 0 titanium sponge with a particle size of 3mm to 12.7mm as the upper layer to carry out cloth in the mould, Then perform pressing treatment to obtain an electrode block;

[0047] Step 4, performing plasma arc welding on 20 electrode blocks obtained in step 3 to obtain electrode rods;

[0...

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Abstract

The invention discloses a preparation method of a high-niobium titanium alloy homogeneous cast ingot, which comprises the following steps: 1, crushing niobium turning scraps to obtain niobium scraps,and carrying out vacuum annealing; 2, mixing the niobium scraps subjected to vacuum annealing with titanium sponge to obtain a mixture; 3, sequentially distributing and pressing the mixture and titanium sponge in a mold to obtain an electrode block; 4, performing electrode assembly welding on the electrode block to obtain an electrode bar; and 5, carrying out vacuum consumable arc melting on the electrode block, and obtaining the high-niobium titanium alloy homogeneous cast ingot. The mass percent of niobium in the high-niobium titanium alloy homogeneous cast ingot prepared by the method is not less than 40%; effective preparation of the niobium-titanium alloy with the high content of refractory metal niobium is achieved, alloy components in the prepared high-niobium-titanium alloy homogeneous cast ingot are evenly distributed, fluctuation is small, the defects of niobium inclusion and the like are avoided, and the requirement of industrial production for the component distribution uniformity of the high-niobium-titanium alloy homogeneous cast ingot is met.

Description

Technical field [0001] The invention belongs to the technical field of metal metallurgy, and specifically relates to a method for preparing homogeneous ingots of high-niobium titanium alloy. Background technique [0002] Niobium is an isomorphous β-stable element in titanium alloys and can be infinitely solid-soluble with titanium. Since the melting point of niobium is much higher than that of titanium and its density is high, there are currently common ingot metallurgical quality problems in high-niobium titanium alloys. [0003] For special titanium alloys containing a large amount of refractory metal niobium, the uniform distribution of the refractory metal element niobium in the ingot is the key to ensuring the quality of the ingot. In the prior art, there are niobium rods and sponge titanium pressed electrodes, or the niobium rod is used as the core of the consumable electrode, the sponge titanium electrode is welded to the niobium rod, and alloy ingots are prepared th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/20C22C14/00C22C1/03C22F1/02C22F1/18
CPCC22B9/20C22C1/03C22C14/00C22F1/02C22F1/18
Inventor 周伟辛社伟陈军李倩贾伟菊张思远李思兰毛成亮
Owner 西安赛特思迈钛业有限公司