Method for preparing polycrystalline raw bar material for molybdenum-niobium alloy monocrystal

A niobium alloy and raw material rod technology is applied in the field of preparation of polycrystalline raw material rods, which can solve the problems of unfavorable and difficult to meet requirements of smelting and preparing alloy single crystal, and achieve the effects of low cost, uniform structure and simple process

Inactive Publication Date: 2010-02-17
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] The molybdenum-niobium alloy sintered rod prepared by the general powder metallurgy method is difficult to meet the requirements of the electron beam suspension zone melting to prepare the molybdenum-niobium alloy single crystal and the polycrystalline raw material rod.
For example, the total content of oxygen, hydrogen, nitrogen, carbon and other gaseous impurity elements in alloy sintered rods prepared by powder metallurgy exceeds 1500ppm, and there are certain defects such as pores in polycrystalline raw material rods, which will affect the subsequent electron beam suspension area melting. It is very unfavorable to prepare alloy single crystal
[0004] At present, there are no published reports on the processing and preparation methods of high-quality polycrystalline raw material rods specially used for the preparation of molybdenum-niobium alloy single crystals.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Select fresh FMo-1 powder and FNb-1 powder, the mass ratio is Mo powder:Nb powder=98:2, mix by mixer for 12 hours, gas impurity elements (C, N, H, O) and other The total mass content of impurity elements is 920ppm, and the mixed powder is pressed into a billet of 16×16×500mm by powder pressing. -2 ~1.9×10 -2 Under the condition of Pa, the billet was sintered in a vacuum sintering furnace for 20 hours, and cooled with the furnace; the obtained molybdenum-niobium alloy sintered rod was welded into an electrode, which was smelted twice in an electron beam melting furnace with a power of 120kw to make a φ90mm × 1000mm molybdenum-niobium alloy ingot, machine-process the molybdenum-niobium alloy ingot into φ83.5mm×1000mm molybdenum-niobium alloy ingot on a lathe, under 1000 ℃ condition, machine on the hydraulic press The processed ingot of φ83.5mm×1000mm is extruded into φ25mm molybdenum-niobium alloy polycrystalline rod, the total deformation rate of extrusion processing is...

Embodiment 2

[0022] Select fresh FMo-1 powder and FNb-1 powder, the mass ratio is Mo powder: Nb powder=97: 3, mix by mixer for 18 hours, gas impurity elements (C, N, H, O) and other The total content of impurity elements is 910ppm. The mixed powder is pressed into a billet of 16×16×500mm by powder pressing. -2 Pa~1.7×10 -2 Sinter under Pa condition for 18 hours, and cool with the furnace; weld the obtained sintered strips into electrodes, and melt the electrodes twice in an electron beam melting furnace with a power of 120kw to make molybdenum-niobium alloy ingots with a diameter of φ90mm×1000mm. Machine-process the molybdenum-niobium alloy ingot into a φ83.5mm×1000mm molybdenum-niobium alloy ingot, and then squeeze the machined φ83.5mm×1000mm ingot on a hydraulic press at 1200°C into a φ30mm molybdenum-niobium alloy polycrystalline bar, the total deformation rate of extrusion processing is 87.1%, and the molybdenum-niobium alloy polycrystalline bar is straightened and sandblasted; then t...

Embodiment 3

[0024] Select fresh FMo-1 powder and FNb-1 powder, the mass ratio is Mo powder:Nb powder=94:6, mix 22 hours through the mixer, gas impurity elements (C, N, H, O) and other The total content of impurity elements is 880ppm. The mixed powder is pressed into a billet of 16×16×500mm by powder pressing. -2 Pa~1.8×10 -2 Sinter under Pa condition for 24 hours, cool with the furnace; weld the obtained sintered bar into electrodes, and make molybdenum-niobium alloy ingots of φ90mm×1000mm through two smelting of electrodes in a 120kw electron beam melting furnace. The molybdenum-niobium alloy ingot is machined into a φ83.5mm×1000mm molybdenum-niobium alloy ingot, and then the φ83.5mm×1000mm ingot is extruded into a φ32mm molybdenum-niobium alloy polycrystalline rod at 1350°C on a hydraulic press , the total deformation rate of extrusion processing is 85.3%, and the molybdenum-niobium alloy polycrystalline bar is straightened and sandblasted; then the bar is heated and forged at 1350°C i...

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Abstract

The invention discloses a method for preparing a polycrystalline raw bar material for a molybdenum-niobium alloy monocrystal. The method comprises the following steps: after mixing FMo-1 powder and FNb-1 powder by a material mixer, pressing powder into a blank bar and sintering the blank bar at high temperature into a sintering bar; welding the obtained sintering bar into an electrode, smelting the electrode in an electron beam smelting furnace twice, preparing a molybdenum-niobium alloy cast ingot, extruding and processing the molybdenum-niobium alloy cast ingot after processing by a machineon an oil press directly into a molybdenum-niobium alloy polycrystalline bar material, aligning the molybdenum-niobium alloy polycrystalline bar material and carrying out shot blasting; and heating the molybdenum-niobium alloy polycrystalline bar material under the atmosphere of argon gas, forging and then preparing the polycrystalline raw bar material for the molybdenum-niobium alloy monocrystalline by centreless grinding. The invention has simple technique and low cost, the total content of impurity elements in the prepared polycrystalline raw bar material does not exceed 500ppm, the bar material has uniform tissues and does not have the defects of cracks or air holes and the like, and the straightness of the polycrystalline raw bar material is not greater than 1mm/m.

Description

technical field [0001] The invention relates to a method for preparing polycrystalline raw material rods, in particular to a method for preparing polycrystalline raw material rods for molybdenum-niobium alloy single crystals by adopting an electron beam suspension zone melting method. The molybdenum-niobium alloy single crystal prepared from the polycrystalline raw material bar is used in space nuclear power systems, core components of thermal ion fuel elements, high-energy physics and its weapon systems, and the like. Background technique [0002] Electron beam levitation zone melting is a classic method for preparing single crystals of refractory metals and their alloys. The method requires polycrystalline raw material rods for preparing alloy single crystals: 1) the total content of impurity elements in the polycrystalline raw material rods generally cannot exceed 500ppm; 2) the structure of the polycrystalline raw material rods is uniform, without cracks or pores, etc. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C11/00C22C27/04C30B29/52
Inventor 胡忠武李中奎殷涛郭林江郑欣张廷杰郑剑平
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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