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Preparation technology for gamma phase U-Mo alloy powder

A preparation process and technology of alloy powder, applied in the field of preparation of γ-phase U-Mo alloy powder, can solve the problems of high powder milling cost, easy environmental pollution, huge equipment, etc., to improve hydrogenation efficiency, reduce impurity content, and improve ball milling. The effect of efficiency

Active Publication Date: 2007-10-24
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the U-Mo alloy powder used in PERTR-1 and PERTR-2 fuel plates is prepared by using the rotating disc centrifugal atomization method invented by South Korea. This process has high temperature during alloy melting, large dust during atomization, and easy to pollute the environment. Huge equipment, low productivity and high milling cost
Similarly, foreign countries such as the United States, Argentina, and Russia use processes such as grinding and 3-4 cycles of hydrogenation-dehydrogenation to prepare alloy powders, resulting in complex processes, low efficiency, high impurity content, and easy oxidation

Method used

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  • Preparation technology for gamma phase U-Mo alloy powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The devices used in this example include a hydrogenation furnace, a planetary ball mill, a muffle furnace, a vacuum sealing device for quartz tubes, a hypoxic glove box, and the like.

[0015] Firstly, the U-2Mo alloy rod was vacuum annealed at 800°C for 2 hours. Grind the surface with metallographic sandpaper, remove the surface oxide film with dilute nitric acid, wash with absolute ethanol, quickly place it in a hydrogenation furnace, and vacuumize it for storage. Raise the temperature of the hydrogenation furnace to 60°C and fill it with 0.2MPa high-purity hydrogen for hydrogenation. The hydrogenation holding time is 2 hours. Then evacuate to 100Pa, continue to heat up to 350°C, and keep warm for 1 hour to dehydrogenate uranium hydride. After dehydrogenation, when the temperature is lowered to 60°C, 0.2 MPa high-purity hydrogen gas is introduced for hydrogenation, and the hydrogenation holding time is 2 hours. After the hydrogenation is completed, the sample is coo...

Embodiment 2

[0018] This example is the same as Example 1, except that the U-7Mo alloy rod is vacuum annealed at 900° C. for 4 hours. Grind with metallographic sandpaper, remove the oxide film on the surface with dilute nitric acid, wash with absolute ethanol, quickly place it in a hydrogenation furnace, and vacuumize it for storage. The hydrogenation furnace was heated up to 150°C, filled with 0.3MPa high-purity hydrogen for hydrogenation, and the hydrogenation holding time was 4 hours. Then evacuate to 60Pa, continue to heat up to 450°C, and keep warm for 2.5 hours to dehydrogenate uranium hydride. After dehydrogenation, when the temperature is lowered to 160°C, 0.3MPa high-purity hydrogen is introduced for hydrogenation, and the hydrogenation holding time is 4 hours. After the hydrogenation is completed, the sample is cooled with the furnace, and a layered and granular uranium hydride-molybdenum dual-phase product is obtained. Use a star ball mill, agate jar and tungsten balls to make...

Embodiment 3

[0021] This example is the same as Example 1, except that the U-10Mo alloy rod is vacuum annealed at 1000° C. for 6 hours. Grind with metallographic sandpaper, remove the oxide film on the surface with dilute nitric acid, wash with absolute ethanol, quickly place it in a hydrogenation furnace, and vacuumize it for storage. The hydrogenation furnace was heated up to 250°C, filled with 0.4MPa high-purity hydrogen for hydrogenation, and the hydrogenation holding time was 6 hours. Then evacuate to 30Pa, continue to heat up to 550°C, and keep warm for 4 hours to dehydrogenate uranium hydride. After dehydrogenation, when the temperature is lowered to 250°C, 0.4MPa high-purity hydrogen is introduced for hydrogenation, and the hydrogenation holding time is 6 hours. After the hydrogenation is completed, the sample is cooled with the furnace, and a layered and granular uranium hydride-molybdenum dual-phase product is obtained. Use a star ball mill, agate jar and tungsten balls to make...

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Abstract

The invention relates to the processing for gamma U-Mo alloy power that annealing the U-(2-10)%Mo alloy bar in 800-1000deg.C for 2-6 hours in vacuum conditions, surface grinding, acid cleaning and drying, hydrogenization in 60-250deg.C, under 0. 2-0. 4MPaH2 pressure for 2-6 hours, then vacuum dehydrogenation in 350-550deg.C, under pressure no more than 100Pa for 1-4 hours, then hydrogenization in 60-250deg.C, under 0. 2-0. 4MPaH2 pressure for 2-6 hours, ball grinding, screening, sealing in the quartz tube, solutionizing and water quenching. The process only needs one time hydrogenization, dehydrogenization, simple, reliable, highly efficient, low impurity level, stable and pure, with grain size being 40-140mum.

Description

technical field [0001] The invention relates to the field of preparation of a crystal metal alloy, in particular to a preparation process of γ-phase U-Mo alloy powder. Background technique [0002] The main goal of the International Research Test Reactor Fuel Low-enriched Uranium (RERTR) program is to develop low-enriched uranium (LEU) fuel with a 235U enrichment of no more than 20% for research test reactors. Replace the highly enriched uranium (HEU) fuel currently in use. So far, nearly 40 research test reactors around the world have been converted to LEU fuel. (U-Mo)-Al dispersed fuel has the advantages of high uranium density, good radiation stability, and easy post-processing, so it has become an important research object in the world. China will also gradually transition from the current U3Si2-Al dispersed fuel to the use of (U-Mo)-Al dispersed fuel. [0003] U-Mo alloy powder is the material basis and key to prepare (U-Mo)-Al dispersed fue...

Claims

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Application Information

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IPC IPC(8): B22F9/04
Inventor 尹邦跃郭聪慧梁雪元
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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