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Smelting preparation method of high-Mo-content U base alloy

A base alloy and content technology, which is applied in the field of smelting and preparation of U-base alloys with high Mo content, can solve the problems of unstable metal uranium and obstacles to the use of fuel, and achieve the effects of light composition segregation and uniform chemical composition.

Active Publication Date: 2017-05-10
CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, the γ-phase uranium metal is not stable in the lower temperature range, and there are significant technical obstacles to its use as a fuel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The smelting preparation method of a U-based alloy with high Mo content according to the present invention includes the following steps

[0021] Raw material preparation: U block is low-carbon U (C≤100μg / g), the size is 10mm×10mm×10mm; the size of Mo particles is The purity is 99.95%.

[0022] Before smelting, the U block should be pickled. First, it was repeatedly washed in nitric acid for 5 minutes, then in ethanol for 3 minutes, and finally dried to remove the oxide layer on the surface of the U block.

[0023] a) Non-consumable vacuum melting

[0024] Prepare U-50wt% Mo master alloy: weigh 50g of U block, and then weigh 50g of Mo pellets;

[0025] The U block and Mo particles are mixed and loaded into the water-cooled copper crucible in the non-consumable vacuum arc melting furnace, and the non-consumable tungsten electrode is used for arc melting; the vacuum degree is 1.0×10 -2 Pa, the smelting output current is 500A, and the stirring current is 8A. In order to ensure the u...

Embodiment 2

[0031] The smelting preparation method of a U-based alloy with high Mo content according to the present invention includes the following steps

[0032] Raw material preparation: U block is low-carbon U (C≤100μg / g), the size is 10mm×10mm×10mm; the size of Mo particles is The purity is 99.95%.

[0033] Before smelting, the U block should be pickled. First, it was repeatedly washed in nitric acid for 8 minutes, then in ethanol for 5 minutes, and finally dried to remove the oxide layer on the surface of the U block.

[0034] a) Non-consumable vacuum melting

[0035] Preparation of U-60% Mo master alloy: Weigh 40g of U block, and then weigh 60g of Mo pellets;

[0036] The U block and Mo particles are mixed and loaded into the water-cooled copper crucible in the non-consumable vacuum arc melting furnace, and the non-consumable tungsten electrode is used for arc melting; the vacuum degree is 1.0×10 -2 Pa, the smelting output current is 500A, and the stirring current is 5A. In order to ensure ...

Embodiment 3

[0041] The smelting preparation method of a U-based alloy with high Mo content according to the present invention includes the following steps:

[0042] Preparation of raw materials: U block is low-carbon U (C≤100μg / g), size is 10mm×10mm×10mm; Mo particle size is The purity is 99.95%.

[0043] Before smelting, the U block should be pickled. First, it was repeatedly washed in nitric acid for 8 minutes, then in ethanol for 5 minutes, and finally dried to remove the oxide layer on the surface of the U block.

[0044] a) Non-consumable vacuum melting

[0045] Prepare U-60wt% Mo master alloy: weigh 40g of U block, and then weigh 60g of Mo pellets;

[0046] The weighted U block and Mo particles are mixed into the water-cooled copper crucible in the non-consumable vacuum arc melting furnace, and the non-consumable tungsten electrode is used for arc melting; the melting output current is 500A, and the stirring current is 8A. Uniformity, to achieve full melting of high melting point Mo, the sa...

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Abstract

The invention provides a smelting preparation method of high-Mo-content U base alloy. The method firstly uses a non-self-consumption vacuum arc smelting furnace for preparing a U-Mo intermediate alloy, and then, smelts added U blocks in a vacuum induction furnace to dilute the U-Mo intermediate alloy to prepare a U-(16-20)wt% Mo alloy; the U-Mo intermediate alloy comprises the alloy components of: 40-60 wt% of U and 40-60 wt% of Mo; and the U-(16-20)wt% Mo alloy comprises the alloy components of: 80-84 wt% of U, and 16-20 wt% of Mo. The U-Mo intermediate alloy is designed through the components; and high-melting-point Mo is fully fused in depleted uranium base by using non-self-consumption vacuum smelting to obtain an alloy more-sufficient U-Mo intermediate alloy button-shaped sample. The U-Mo intermediate alloy prepared by the method is uniform in chemical components, and is lighter in component segregation phenomenon; and the XRD detects and analyzes the room temperature as stable gamma phase.

Description

Technical field [0001] The invention belongs to the technical field of nuclear fuel and preparation, and specifically relates to a smelting preparation method of a U-based alloy with high Mo content. Background technique [0002] Today, when fossil energy is increasingly depleted, nuclear energy occupies an increasingly important position. The technology for the use of fission nuclear fuel is quite mature, and nuclear fuel based on uranium is the most widely used. However, ordinary metallic uranium is α phase below 668°C, and its corrosion resistance and radiation resistance are very poor. This is undesirable as a fuel. The γ-phase metallic uranium has better resistance to radiation effects than the α-phase, and exhibits isotropic thermal expansion characteristics, making it more suitable as a nuclear fuel. Unfortunately, the γ-phase metallic uranium cannot stably exist in a lower temperature range, and its use as a fuel presents significant technical obstacles. One way to so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C28/00C22B9/20C22B9/04
CPCC22B9/003C22B9/04C22B9/20C22C1/03C22C28/00Y02P10/25
Inventor 陈连重白志勇张雪伟康泰峰刘建成付德钰
Owner CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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