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Crackless yttrium hydride neutron moderation material for space reactor and preparation method of crack-free yttrium hydride neutron moderation material

A crack-free, yttrium hydride technology, applied in transition element hydrides, moderators/core structures, reactors, etc., to achieve the effect of improving hydrogen atom density, excellent mechanical properties and processing performance, and avoiding thermal stability

Pending Publication Date: 2022-07-29
西安稀有金属材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there are few systematic reports on the method and process route of powder metallurgy to prepare high hydrogen content and crack-free yttrium hydride neutron moderator materials

Method used

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  • Crackless yttrium hydride neutron moderation material for space reactor and preparation method of crack-free yttrium hydride neutron moderation material
  • Crackless yttrium hydride neutron moderation material for space reactor and preparation method of crack-free yttrium hydride neutron moderation material

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Embodiment 1

[0025] The crack-free yttrium hydride neutron moderator material of this embodiment is composed of the following elements by mass: the total mass percentage of Y and H is 99.00%, and the mass percentage of H is 1.83%, and the rest are unacceptable Avoid impurities.

[0026] The preparation method of the crack-free yttrium hydride neutron moderator material of the present embodiment comprises the following steps:

[0027] Step 1. Select yttrium metal powder with a mass purity of 99.5% and form it into a designed shape by cold pressing to obtain a pressed metal yttrium blank; The time is 3min;

[0028] Step 2, put the metal yttrium pressed blank obtained in the step 1 into a molybdenum boat, then place it in a high temperature hydrogenation furnace as a whole, and evacuated to a vacuum degree of 10 -2 After Pa, into the high-temperature hydrogenation furnace at a flow rate of 0.1 L / min, hydrogen with a mass purity of 99.95% was introduced for sintering, and the hydrogen pressu...

Embodiment 2

[0033] The crack-free yttrium hydride neutron moderator material of this embodiment is composed of the following elements by mass: the total mass percentage of Y and H is 99.2%, and the mass percentage of H is 2.02%, and the rest are unacceptable Avoid impurities.

[0034] The preparation method of the crack-free yttrium hydride neutron moderator material of the present embodiment comprises the following steps:

[0035] Step 1. Select yttrium metal powder with a mass purity of 99.5% and form it into a designed shape by cold pressing to obtain a pressed metal yttrium blank; The time is 6min;

[0036] Step 2, put the metal yttrium pressed blank obtained in the step 1 into a molybdenum boat, then place it in a high temperature hydrogenation furnace as a whole, and evacuated to a vacuum degree of 10 -1 After Pa, pass hydrogen with a mass purity of 99.95% into the high-temperature hydrogenation furnace at a flow rate of 0.5 L / min, and then sinter, and ensure that the hydrogen pre...

Embodiment 3

[0039] The crack-free yttrium hydride neutron moderator material of this embodiment is composed of the following elements by mass: the total mass percentage of Y and H is 99.20%, and the mass percentage of H is 2.03%, and the rest are unacceptable Avoid impurities.

[0040] The preparation method of the crack-free yttrium hydride neutron moderator material of the present embodiment comprises the following steps:

[0041] Step 1. Select yttrium metal powder with a mass purity of 99.5% and form it into a designed shape by cold pressing to obtain a pressed metal yttrium blank; The time is 10min;

[0042] Step 2, put the metal yttrium pressed blank obtained in the step 1 into a molybdenum boat, then place it in a high temperature hydrogenation furnace as a whole, and evacuated to a vacuum degree of 10 -2 After Pa, feed hydrogen with a mass purity of 99.99% into the high-temperature hydrogenation furnace at a flow rate of 0.8 L / min, and then sinter, and ensure that the hydrogen p...

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Abstract

The invention discloses a crack-free yttrium hydride neutron moderation material for a space reactor, which is prepared from the following elements in percentage by mass: more than 99.00% of total mass percentage of Y and H, more than 1.83% of mass percentage of H and the balance of inevitable impurities, the invention further discloses a preparation method of the material. The preparation method comprises the following steps: 1, cold press molding of metal yttrium powder; and 2, sequentially vacuumizing, introducing hydrogen and sintering. According to the invention, the element composition and content are limited, the density of hydrogen atoms in yttrium hydride is improved, the rapid moderation performance of yttrium hydride is ensured, and the influence of metal impurity elements on thermal stability, neutron moderation performance and neutron economy is avoided; according to the method, a powder metallurgy method is adopted, the expansion effect of yttrium metal lattices in the hydrogenation process is counteracted through sintering shrinkage, internal stress is reduced, the yttrium hydride neutron moderation material which is large in density, high in hydrogen content and free of cracks is prepared, and the method is suitable for manufacturing neutron moderation components which are good in space reactor high-temperature thermal stability.

Description

technical field [0001] The invention belongs to the technical field of space nuclear reactors and nuclear propulsion, and in particular relates to a crack-free yttrium hydride neutron moderator material for space reactors and a preparation method thereof. Background technique [0002] To develop new strategic industries, it is necessary to accelerate the development of aerospace and space exploration. Miniature modular or compact advanced reactors have become an emerging nuclear technology worldwide due to their small size, high power output and low cost, and have potential applications in providing power for space nuclear reactors. Compared with other hydrogen-containing materials such as light water and heavy water, space reactors use metal hydrides as neutron moderator materials because such materials can maintain a high density of hydrogen atoms at high temperatures. The traditional space reactor design uses zirconium hydride (ZrH 2-x ) as neutron moderator materials, ...

Claims

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Application Information

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IPC IPC(8): C01B6/02G21C5/12G21K1/00
CPCC01B6/02G21C5/12G21K1/00C01P2006/80C01P2006/10C01P2002/72C01P2002/80
Inventor 李欢吴金平张于胜刘承泽刘后龙吴俊宇赵星
Owner 西安稀有金属材料研究院有限公司
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