Preparation method of high-performance vanadium wire for self-powered neutron detector

A neutron detector, self-sufficient energy technology, applied in the direction of neutron radiation measurement, instruments, measurement devices, etc., can solve the problem of difficult to ensure the consistency and stability of high-performance vanadium wire, difficult to meet the emission of self-sufficient energy neutron detectors It is easy to control the temperature gradient, the stability of mechanical properties and surface quality is good, and the purity and density are improved.

Active Publication Date: 2021-12-07
CHONGQING MATERIALS RES INST
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Problems solved by technology

Because metal vanadium belongs to the body-centered cubic structure, there is a phenomenon of plastic-brittle transition in the process of deformation processing, and it is easy to oxidize and absorb gas during high-temperature processing to show brittleness, which makes high-temperature deformation processing of vanadium wire extremely difficult, and it is easy to cause The surface quality of vanadium wire is damaged, and it is difficult to ensure the consistency and stability of high-performance vanadium wire
[0003]At present, the high-performance vanadium wires used in domestic self-sufficient neutron detectors still rely on imports from abroad. Due to problems such as low quality stability and poor product consistency, high-performance vanadium wires cannot be obtained by using existing technologies, and there is still a performance gap with vanadium wires imported from abroad, and it is difficult to meet the technology of self-sufficient neutron detector emitters. Require

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  • Preparation method of high-performance vanadium wire for self-powered neutron detector

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Experimental program
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Effect test

Embodiment 1

[0024] Weigh vanadium powder 1500g, add vanadium powder to 2500ml of 30wt% HNO 3 Stir the aqueous solution into a slurry, add deionized water to stir and wash, stop adding deionized water when the pH test paper is neutral, and dry the acid-washed vanadium powder in a vacuum drying oven at a drying temperature of 65°C and a drying time of 12 hours. Vacuum 10 -3 Pa, dry to obtain pretreated vanadium powder.

[0025] The vanadium powder is pressed into shape by a cold isostatic press. Put the vanadium powder into the rubber mold sleeve and hold the pressure at 240MPa for 90s in a cold isostatic press to obtain a vanadium rod with a diameter of φ18mm, and then put it into a vacuum intermediate frequency sintering furnace for vacuum sintering with a vacuum degree of ≥10 -4 Pa, the sintering system is: heating rate 10°C / min, heat preservation at 500°C for 30 minutes, heat preservation at 1000°C for 60 minutes, heat preservation at 1500°C for 120 minutes, and cooling with the furna...

Embodiment 2

[0030] Weigh vanadium powder 2000g, add vanadium powder to 30wt% HNO of 3500ml 3 Stir the aqueous solution into a slurry, add deionized water to stir and wash, stop adding deionized water when the pH test paper is neutral, and dry the acid-washed vanadium powder in a vacuum drying oven at a drying temperature of 70°C and a drying time of 15 hours. Obtain pretreated vanadium powder.

[0031] The vanadium powder is pressed into shape by a cold isostatic press. Put the vanadium powder into the rubber mold sleeve and hold the pressure at 280MPa for 60s in the cold isostatic press to obtain a vanadium rod with a diameter of φ20mm, and then put it into a vacuum intermediate frequency sintering furnace for vacuum sintering, with a vacuum degree of ≥10 -4 Pa, the sintering system is: heating rate 10°C / min, heat preservation at 500°C for 40 minutes, heat preservation at 1000°C for 80 minutes, heat preservation at 1500°C for 120 minutes, and cooling with the furnace. The sintered meta...

Embodiment 3

[0036] Weigh vanadium powder 2500g, add vanadium powder to 4000ml of 30wt% HNO 3 Stir the aqueous solution into a slurry, add deionized water to stir and wash, stop adding deionized water when the pH test paper is neutral, and dry the acid-washed vanadium powder in a vacuum drying oven at a drying temperature of 70°C and a drying time of 18 hours. Obtain pretreated vanadium powder.

[0037] The vanadium powder is pressed into shape by a cold isostatic press. Put the vanadium powder into the rubber mold sleeve and hold the pressure at 220MPa for 120s in the cold isostatic press to obtain a vanadium rod with a diameter of φ20mm, and then put it into a vacuum intermediate frequency sintering furnace for vacuum sintering, with a vacuum degree of ≥10 -4 Pa, the sintering system is: heating rate 10°C / min, heat preservation at 500°C for 60 minutes, heat preservation at 1100°C for 60 minutes, heat preservation at 1500°C for 150 minutes, and cooling with the furnace. The sintered met...

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Abstract

The invention discloses a preparation method of a high-performance vanadium wire for a self-powered neutron detector. The method comprises the steps of vanadium powder pretreatment, cold isostatic pressing forming, vacuum sintering, vacuum vertical melting, electron beam floating zone smelting, rotary swaging, wire drawing, continuous electrolytic polishing and annealing treatment. According to the method, the purity of the vanadium wire is greater than or equal to 99.9%, the content of impurity elements of B, Cd, Cr and Cu is smaller than or equal to 30 ppm, the diameter of the finished vanadium wire is 1.00-1.50 mm, the precision reaches + / -0.005 mm, the surface roughness is smaller than or equal to Ra1.6 microns, the tensile strength is larger than or equal to 400 MPa, the ductility is larger than or equal to 10%, the resistance uniformity is + / -1.5%, the precision is high, the stability of the mechanical property and the surface quality is good, and the use performance requirement of a self-powered neutron detector emitter material of nuclear power engineering can be met.

Description

technical field [0001] The invention belongs to the field of metal material preparation, and in particular relates to a preparation method of high-performance vanadium wire for a self-sufficient neutron detector. Background technique [0002] High-performance vanadium wire is the key material for the emitter of self-sufficient neutron detectors in nuclear power engineering. Its material purity, wire diameter consistency, mechanical properties and stability of surface quality directly affect the sensitivity, measurement Critical performances such as accuracy, lifetime, and neutron flux measurements. High-performance vanadium wire requires a purity of V≥99.9%, the content of B, Cd, Cr, and Cu radiation-resistant impurity elements ≤30ppm, the deviation of the nominal diameter of the vanadium wire does not exceed ±0.01mm, and the surface roughness is not greater than Ra1.6μm. Tensile strength ≥ 400MPa, elongation ≥ 7%, meter resistance uniformity ± 1.5%. Because metal vanadium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22C21D8/06B22F1/00B22F3/04B22F3/10C21D1/26C22B9/22C22F1/18C25F3/26B21C37/04G01T3/00
CPCC22B34/22B22F3/04B22F3/1007C22B9/228B22F3/1035B22F3/1017C21D8/06C21D1/26C22F1/18C25F3/26B21C37/047G01T3/00B22F2999/00B22F2201/20Y02E30/30
Inventor 王焱辉刘奇吕学伟薄新维王小宇韩校宇姚志远何浩然陈喜刘晓芸
Owner CHONGQING MATERIALS RES INST
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