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Preparation method of niobium-zirconium alloy ingot

A technology of alloy ingot casting, niobium and zirconium, which is applied in the field of new material preparation, can solve the problems that the small amount of electron beam single-furnace smelting is not suitable for industrial scale alloy ingot production, it is difficult to accurately control the alloy composition, and the alloy composition is difficult to accurately control, etc. , to achieve good feeding effect, low cost, and few types of alloys

Inactive Publication Date: 2020-01-10
XIAN SUPERCRYSYAL SCI TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the electron beam smelting process consumes a lot of energy, and the cost is high. It is difficult to accurately control the alloy composition, and the ingot grains are coarse, the surface quality is poor, and metallurgical defects such as shrinkage cavities are prone to occur, which brings inconvenience to subsequent forging and other thermal processing.
Although the method of combining electron beam and vacuum consumable melting solves the metallurgical defects of alloy ingots, it is difficult to accurately control the alloy composition, and the small amount of electron beam single-furnace melting is not suitable for the production of industrial-scale alloy ingots

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] A method for preparing a niobium-zirconium alloy ingot, characterized in that it comprises the following steps:

[0026] Step 1: using niobium rods (Nb1), zirconium plates or zirconium strips as raw materials, weighing the raw materials according to the zirconium weight percentage of 1.0-5.0% during batching.

[0027] Step 2: Evenly weld the zirconium plate or zirconium bar weighed in step 1 on the niobium rod along the length of the niobium rod to make a consumable electrode.

[0028] Step 3: The consumable electrode in step 2 is smelted once by using a vacuum consumable smelting method to obtain a primary ingot.

[0029] Step 4: The primary ingot obtained in step 3 is used as a consumable electrode for secondary smelting to obtain a secondary ingot.

[0030] Step 5: Peel the ingot in step 4, remove the riser after flaw detection, and obtain the finished ingot, that is, the niobium-zirconium alloy ingot.

[0031] The zirconium plate and zirconium bar in the step 1 ar...

Embodiment 1

[0037] Taking the preparation of 500kg Nb-1.0% Zr alloy as an example of an alloy ingot as an example, the preparation steps are as follows:

[0038] Step 1: Use niobium rods (Nb1) and zirconium plates as raw materials, and the zirconium plates are generally leftovers after processing, with a thickness of ≤3mm. Calculated according to the zirconium content of 1%, the weight of the required zirconium plate is 5Kg, the number of niobium rods is 2 pieces, and the weight of each piece is 247.5Kg, 2 pieces in total.

[0039] Step 2: Take a 2.5Kg zirconium plate and weld it on a niobium rod evenly along the length of the niobium rod. The welding is carried out in a vacuum plasma welding box, and the welding vacuum degree is ≤5.0×10 0 Pa, made of consumable electrodes, a total of 2 pieces.

[0040] Step 3: Melt the consumable electrode in step 2 using the vacuum consumable melting method. The size of the crucible used for melting is Φ280mm. The bottom pad must be placed during melti...

Embodiment 2

[0045] Taking the preparation of 500kg Nb-2.0% Zr alloy as an example of an alloy ingot as an example, the preparation steps are as follows:

[0046] Step 1: Niobium rods (Nb1) and zirconium bars are used as raw materials, and the zirconium bars are generally leftovers after processing, with a thickness of ≤3mm. According to the calculation of 2% zirconium content, the weight of zirconium rods required is 10Kg, the quantity of niobium rods is 2 pieces, and the weight of each piece is 245Kg, 2 pieces in total.

[0047] Step 2: Take a 5Kg zirconium bar and weld it on a niobium bar evenly along the length of the niobium bar. The welding is carried out in a vacuum plasma welding box, and the welding vacuum degree is ≤5.0×10 0 Pa, made of consumable electrodes, a total of 2 pieces.

[0048] Step 3: Melt the consumable electrode in step 2 using the vacuum consumable melting method. The size of the crucible used for melting is Φ280mm. The bottom pad must be placed during melting. Th...

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Abstract

The invention provides a preparation method of a niobium-zirconium alloy ingot. The preparation method of the niobium-zirconium alloy ingot comprises the steps that zirconium plates and a niobium rodare weighed or zirconium bars and the niobium rod are weighed, the zirconium plates or the zirconium bars are evenly welded to the niobium rod in the length direction of the niobium rod, and a consumable electrode is made; primary smelting is conducted on the consumable electrode, and then a primary ingot is obtained after cooling; the primary ingot is used as the consumable electrode for secondary smelting, and then the niobium-zirconium alloy ingot is obtained after cooling. The preparation method of the niobium-zirconium alloy ingot only adopts a vacuum consumable electric arc smelting method to prepare the niobium-zirconium alloy ingot, the smelting current is increased, the smelting voltage is greatly increased, the power is multiplied, and then generated enough heat fully melts the high-melting-point niobium. The preparation method of the niobium-zirconium alloy ingot can achieve the purposes of cleanness and uniformity of the niobium-zirconium alloy ingot, the ingredient deviation of the longitudinal main element zirconium of the ingot is controlled to be within 0.3%, and industrial scale ingot preparation can be achieved.

Description

technical field [0001] The invention belongs to the field of new material preparation, and relates to a method for preparing a niobium-zirconium alloy ingot. Background technique [0002] Niobium-zirconium alloys are binary alloys in which niobium is the matrix element. Niobium element has the characteristics of high melting point, corrosion resistance, and good cold workability. Adding zirconium element to niobium can obviously increase the strength of the material without affecting the plasticity and processing properties of the alloy, and can also improve the oxidation resistance and alkali metal resistance of the alloy. corrosion performance. It is usually used as a structural material for aero-engines, a key component material for reactors, and a variety of corrosion-resistant parts. [0003] In this alloy, niobium is the matrix, and the melting point of Nb is 2468°C, which is a refractory metal. Therefore, for high purity requirements, electron beam melting or a comb...

Claims

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Application Information

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IPC IPC(8): C22C27/02C22C1/02
CPCC22C1/02C22C27/02
Inventor 周中波刘娣薛祥义张利军吴天栋刘小花焦勇
Owner XIAN SUPERCRYSYAL SCI TECH DEV CO LTD