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Preparation method of tungsten or molybdenum-based fuel pellets dispersed with uranium dioxide core balls

A technology of uranium dioxide and fuel pellets, which is applied in the direction of reactor fuel materials, manufacturing reactors, reducing greenhouse gases, etc. It can solve the problems of inability to achieve high mixing uniformity and the proportion of binders should not be too high, and achieve a high degree of mixing , the effect of uniform mixing degree

Active Publication Date: 2022-05-13
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to literature reports, the binders used include polyethylene (Journal of Nuclear Materials 486 2017 246-249), ethylene copolymers (Journal of Physical Science and Application 5 2015 255-262), etc., which are characterized by a relatively low melting point. In the heat treatment process, it can be melted first, and its fluidity can be used to promote the uniform distribution of the fuel. However, since the proportion of the binder should not be too high to prevent the residual product from reacting with the uranium dioxide fuel or the metal matrix, this method can only achieve Partial uniform mixing, but cannot achieve overall high mixing uniformity

Method used

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  • Preparation method of tungsten or molybdenum-based fuel pellets dispersed with uranium dioxide core balls
  • Preparation method of tungsten or molybdenum-based fuel pellets dispersed with uranium dioxide core balls
  • Preparation method of tungsten or molybdenum-based fuel pellets dispersed with uranium dioxide core balls

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Embodiment 1

[0028] A method for preparing tungsten-based fuel pellets dispersed with uranium dioxide core balls, specifically comprising:

[0029] Raw material preparation: uranium dioxide microspheres with a total volume ratio of 60V% and a particle size of 200 microns, a tungsten-based metal nanopowder with a total volume ratio of 40V% and a particle size of 600nm, the binder is liquid paraffin, The total amount is 2wt% of the total mass of uranium dioxide microspheres and tungsten-based metal nanopowders, and the amount of binder in step S1 is 1wt% of the total mass of uranium dioxide microspheres and tungsten-based metal nanopowders, The amount of the binder in step S2 is 1wt% of the total mass of the uranium dioxide microspheres and the tungsten-based metal nanopowder;

[0030] The preparation of tungsten-based fuel pellets specifically includes the following steps:

[0031] S1. Dissolve liquid paraffin in acetone to obtain a binder solution, then soak the uranium dioxide microspher...

Embodiment 2

[0038] A method for preparing molybdenum-based fuel pellets dispersedly distributed with uranium dioxide core balls, specifically comprising:

[0039] Raw material preparation: uranium dioxide microspheres with a total volume ratio of 65V% and a particle size of 180 microns, molybdenum-based metal nanopowders with a total volume ratio of 35V% and a particle size of 500nm, the binder is solid paraffin, Its dosage is 1wt% of the total mass of uranium dioxide microspheres and molybdenum-based metal nanopowders;

[0040] The preparation of molybdenum-based fuel pellets specifically comprises the following steps:

[0041] S1. Dissolve solid paraffin in acetone to obtain a binder solution, then immerse the uranium dioxide microspheres in the binder solution for 30 minutes, dry and remove the acetone, and obtain a uranium dioxide core with solid paraffin evenly attached to the surface ball;

[0042] S2. Mix the uranium dioxide core balls with solid paraffin evenly attached to the s...

Embodiment 3

[0046] A method for preparing tungsten-based fuel pellets dispersed with uranium dioxide core balls, specifically comprising:

[0047] Raw material preparation: uranium dioxide microspheres with a total volume ratio of 30V% and a particle size of 1000 microns, a tungsten-based metal nanopowder with a total volume ratio of 70V% and a particle size of 200nm, and a binder of polytetrafluoroethylene Ethylene, the amount of which is 0.1wt% of the total mass of uranium dioxide microspheres and tungsten-based metal nanopowders;

[0048] The preparation of tungsten-based fuel pellets specifically includes the following steps:

[0049] S1. Dissolve polytetrafluoroethylene in acetone to obtain a polytetrafluoroethylene solution, then soak the uranium dioxide microspheres in the polytetrafluoroethylene solution for 30 minutes, dry and remove the acetone, and obtain a polytetrafluoroethylene uniformly attached to the surface Uranium dioxide cores of ethylene;

[0050] S2. Mix the uraniu...

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Abstract

The invention discloses a method for preparing tungsten or molybdenum-based fuel pellets dispersedly distributed with uranium dioxide core balls. After drying, a uranium dioxide core ball with a binder evenly attached to the surface is obtained; then the uranium dioxide core ball, tungsten or molybdenum-based metal powder and / or binder are mixed, and molded to obtain a pellet body; The pellet body is sintered under protective gas or vacuum conditions to obtain the tungsten or molybdenum-based fuel pellets dispersed with uranium dioxide pellets. The invention realizes the uniform dispersion of large-sized uranium dioxide core balls in the tungsten or molybdenum-based metal matrix through a specific mixing process.

Description

technical field [0001] The invention relates to the technical field of nuclear fuel, in particular to a method for preparing tungsten or molybdenum-based fuel pellets dispersed with uranium dioxide pellets. Background technique [0002] The nuclear propulsion system is the best or even the only choice for deep space exploration and manned aviation in the future. With the gradual and successful implementation of the "Shenzhou" manned aviation, the "Chang'e" lunar exploration program, and the Mars program, my country is in the process of rapid development of the aerospace industry During the critical period, more distant deep space exploration and manned landing on other stars will surely become the next development focus of my country's aerospace development. Therefore, the research and development of related key components of the nuclear propulsion system is urgent. As a key component of the space fission reactor in the nuclear propulsion system, fuel pellets are the key to i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C21/02G21C21/10G21C3/64
CPCG21C21/02G21C21/10G21C3/64Y02E30/30
Inventor 张临超景柯刘瑞谢卓明李刚何琨王先平方前锋吴学邦刘长松
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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