A kind of spark plasma sintering preparation method of cermet fuel pellets

A technology of discharge plasma and fuel pellets, which is applied in nuclear power generation, manufacturing reactors, metal processing equipment, etc., can solve the problems of high sintering temperature, inability to apply CERMET pellets, etc. , Reduce the effect of production energy consumption and equipment requirements

Active Publication Date: 2020-11-10
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another problem with the Tucker method is that in order to achieve a high pellet density (>99% of the theoretical density of the pellet), the sintering temperature must also reach 1850°C
[0013] In summary, CERMET fuel has not been extensively studied internationally, and its most mature manufacturing process is vapor deposition hot isostatic pressing, but this method is aimed at UO 2 -W is developed with a single component and cannot be applied to CERMET pellets with all components
For example, the sintering temperature of this method is very high, so it cannot be applied to the preparation of pyrolysis UN-W fuel pellets
In order to meet the needs of a wider range of CERMET fuel production in the future, the development of new general-purpose production technologies is a must, among which SPS technology is an optional direction. The main problem is that the metal phase and the ceramic phase are evenly mixed when the content of the metal phase is low. properties and preparation of high-density pellets

Method used

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  • A kind of spark plasma sintering preparation method of cermet fuel pellets
  • A kind of spark plasma sintering preparation method of cermet fuel pellets
  • A kind of spark plasma sintering preparation method of cermet fuel pellets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: Preparation of CERMET fuel pellets by spark plasma sintering (1)

[0039] Weigh 33.89g of UN powder, and deposit a layer of metal Mo layer on the surface of UN powder particles by vapor deposition process for later use.

[0040] Weigh 16.11g metal Mo powder, and ZrO 2 ZrO 2 The ball mill tank is used for high-energy ball milling, and the conditions are: the volume ratio of balls to materials is 5:1, the milling speed is 400 rpm, and the ball milling time is 24 hours. During the milling process, the milling jar is filled with inert gas for protection. Open the ball mill jar in an inert gas glove box, and separate the milled balls. Put the ball-milled metal Mo powder into the Mo crucible, transfer it into the atmosphere furnace, turn on the heating, and continuously feed high-purity H 2 The gas is used to reduce the metal Mo powder, and the reduction temperature is 400°C.

[0041] The metal Mo powder after reduction treatment and the UN powder treated by v...

Embodiment 2

[0043] Example 2: Preparation of CERMET fuel pellets by spark plasma sintering (2)

[0044] Weigh 23g UO 2 powder, using a vapor deposition process at UO 2 Deposit a layer of metal W layer on the surface of the powder particles for later use;

[0045] Weigh 27g of metal W powder, put it into a W ball mill tank together with W balls for high energy ball milling, the conditions are: the volume ratio of balls to material is 10:1, the milling speed is 800 rpm, and the ball milling time is 8 hours. During the milling process, the milling jar is filled with inert gas for protection. Open the ball mill jar in an inert gas glove box, and separate the milled balls. Put the ball-milled metal W powder into the W crucible, transfer it into the atmosphere furnace, turn on the heating, and continuously feed high-purity H 2 The gas is used to reduce the metal W powder, and the reduction temperature is 800°C.

[0046] Combine the reduced metal W powder with the vapor-deposited UO 2 The ...

Embodiment 3

[0048] Example 3: Preparation of CERMET fuel pellets by spark plasma sintering (3)

[0049] Weigh 34.72g UO 2 powder, using a vapor deposition process at UO 2 A layer of metal W layer is deposited on the surface of the powder particles for later use.

[0050] Weigh 15.28g of metal W powder, and put it into a W ball mill tank together with W balls for high-energy ball milling. The conditions are: the ball-to-material volume ratio is 7:1, the milling speed is 600 rpm, and the ball milling time is 16 hours. During the milling process, the milling jar is filled with inert gas for protection. Open the ball mill jar in an inert gas glove box, and separate the milled balls. Put the ball-milled metal W powder into the W crucible, transfer it into the atmosphere furnace, turn on the heating, and continuously feed high-purity H 2 The gas is used to reduce the metal W powder, and the reduction temperature is 700°C.

[0051] Combine the reduced metal W powder with the vapor-deposited...

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Abstract

The invention belongs to the technical field of nuclear fuel preparation, and relates to a method for preparing CERMET fuel pellets by discharge plasma sintering. The preparation method comprises the following steps in turn: (1) depositing a metal layer on the surface of ceramic phase particles by vapor deposition process; (2) putting metal phase powder and grinding balls into a ball mill pot for high-energy ball milling, and the powder after ball milling is After the metal phase powder is transferred into the atmosphere furnace, the heating is turned on, and the high-purity H is continuously introduced. 2 (3) Mix the ceramic phase powder processed by vapor phase deposition with the metal phase powder processed by high-energy ball milling and reduction treatment with a three-dimensional motion mixer to obtain SPS sintering raw materials; (4) Put the SPS sintering raw materials into The SPS mold is placed in the sintering furnace, vacuumed and sintered. By using the preparation method of the invention, the continuous metal phase and the uniform distribution of ceramic phase particles in the metal phase matrix can be realized under the premise of a relatively low volume ratio of the metal phase, and the sintering temperature of the core block can be further reduced.

Description

technical field [0001] The invention belongs to the technical field of nuclear fuel preparation, and relates to a method for preparing CERMET fuel pellets by discharge plasma sintering. Background technique [0002] Ceramic refractory metal composite fuel (CERMET fuel) has the advantages of high operating temperature, high burnup, high radiation stability, high fission product storage capacity, etc., and it has inherent safety. ) also maintains a subcritical state. [0003] Optional ceramic types in CERMET fuel include UO 2 , UN, UC, etc., optional refractory metals include Ni, W, Mo, Re, etc., which can produce UO 2 -Ni, UO 2 -W, UN-W, UC 2 -C and other series of composite pellet components. The following table is a list of selected CERMET fuel components in various development programs in the United States. [0004] Table 1 Selection of CERMET fuel components in various development programs in the United States [0005] [0006] In the tests of these research pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C1/10C22C29/16C22C29/12G21C21/16B22F1/02B22F9/04B22F3/105
CPCC22C1/051C22C29/16C22C29/005C22C29/12G21C21/16B22F9/04B22F3/105B22F2009/043B22F1/17Y02E30/30
Inventor 屈哲昊尹邦跃王轩任劲如魏国良
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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