A microwave synthesis method of uranium-zirconium carbonitride powder

A technology of uranium-zirconium carbonitride and microwave synthesis, applied in nitrogen compounds, chemical instruments and methods, nitrogen and non-metallic compounds, etc., can solve the problems of easy sintering and agglomeration of green body, difficulty in forming solid solution at low reaction temperature, and increased difficulty, etc. problem, to achieve the effect of high activity

A technology of uranium-zirconium carbonitride and microwave synthesis, applied in nitrogen compounds, chemical instruments and methods, nitrogen and non-metallic compounds, etc., can solve the problems of easy sintering and agglomeration of green body, difficulty in forming solid solution at low reaction temperature, and increased difficulty, etc. problem, to achieve the effect of high activity

CN110156475BActive Publication Date: 2020-11-10CHINA INSTITUTE OF ATOMIC ENERGY
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  • A microwave synthesis method of uranium-zirconium carbonitride powder
  • A microwave synthesis method of uranium-zirconium carbonitride powder
  • A microwave synthesis method of uranium-zirconium carbonitride powder

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Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1: Microwave synthesis of uranium-zirconium carbonitride powder (1)

[0028] Weigh UO 2 Powder 17.75g, ZrO 2 24.10g of powder and 8.15g of carbon powder were mixed and put into a high-energy ball mill for ball milling. The conditions were: the volume ratio of the ball to material was 3:1, the ball milling speed was 300 rpm, and the ball milling time was 16 hours.

[0029] Pour out the ball-milled material, separate the ball material and sieve to obtain a mixed powder, use a cemented carbide mold on a hydraulic press to press the mixed powder into a green body, the pressing pressure is 50MPa, and the holding time is 30s.

[0030] Put the pressed green body into a microwave high-temperature furnace and vacuumize to 10 -3 Pa, continuous feeding of high-purity N 2 , keeping N in the furnace 2 The pressure is 0.13MPa, microwave heating is turned on, the temperature is raised to 1600°C, and the temperature is kept for 1 hour to obtain (U,Zr)(C,N) powder, which ...

Embodiment 2

[0031] Embodiment 2: Microwave synthesis of uranium-zirconium carbonitride powder (two)

[0032] Weigh UO 2 Powder 29.57g, ZrO 2 13.38g of powder and 7.05g of carbon powder were mixed and put into a high-energy ball mill for ball milling. The conditions were: the volume ratio of the ball to material was 4:1, the ball milling speed was 400 rpm, and the ball milling time was 8 hours.

[0033] Pour out the ball-milled material, separate and sieve the ball material to obtain a mixed powder, use a cemented carbide mold on a hydraulic press to press the mixed powder into a green body, the pressing pressure is 80MPa, and the holding time is 20s.

[0034] Put the pressed green body into a microwave high-temperature furnace and vacuumize to 10 -3 Pa, continuous feeding of high-purity N 2 , keeping N in the furnace 2 The pressure is 0.12MPa, microwave heating is turned on, the temperature is raised to 1400°C, and the temperature is kept for 2 hours to obtain (U,Zr)(C,N) powder, whic...

Embodiment 3

[0035] Embodiment 3: Microwave synthesis of uranium-zirconium carbonitride powder (three)

[0036] Weigh UO 2 Powder 38.00g, ZrO 2 5.73g of powder and 6.27g of carbon powder were mixed and put into a high-energy ball mill for ball milling. The conditions were: the volume ratio of the ball to material was 5:1, the ball milling speed was 500 rpm, and the ball milling time was 4 hours.

[0037] Pour out the ball-milled material, separate the ball material and sieve to obtain a mixed powder, use a cemented carbide mold on a hydraulic press to press the mixed powder into a green body, the pressing pressure is 100MPa, and the holding time is 10s.

[0038] Put the pressed green body into a microwave high-temperature furnace and vacuumize to 10 -3 Pa, continuous feeding of high-purity N 2 , keeping N in the furnace 2 The pressure is 0.11MPa, microwave heating is turned on, the temperature is raised to 1300°C, and the temperature is kept for 4 hours to obtain (U,Zr)(C,N) powder, wh...

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Abstract

The invention belongs to the technical field of nuclear fuel preparation, and relates to a microwave synthesis method for zirconium uranium carbonitride powder. The microwave synthesis method sequentially comprises the following steps: (1) ball-milling: weighing UO2 powder, ZrO2 powder and carbon powder, performing uniform mixing, pouring the obtained mixture into a mill pot, adding grinding balls, and performing ball milling; (2) pressing: pouring out the ball-milled material, separating the balls and the material, sieving the material, and pressing the ball-milled raw material powder in a hydraulic machine to form a green body; and (3) performing microwave calcination: placing the green body in a microwave high-temperature furnace, vacuumizing the furnace, introducing an atmosphere gas,carrying out microwave heating to 1300-1600 DEG C, and performing heat insulation calcining to obtain the zirconium uranium carbonitride powder. The synthesis method for zirconium uranium carbonitridepowder is used to directly obtain a (U,Zr)(C,N) single solid solution phase at a low reaction temperature, and the synthesized (U,Zr)(C,N) powder has a high activity, and can be directly used in thesubsequent pellet sintering process.

Description

technical field [0001] The invention belongs to the technical field of nuclear fuel preparation, and relates to a microwave synthesis method of uranium-zirconium carbonitride powder. Background technique [0002] Carbonitride nuclear fuel generally refers to fuel in the form of (U,X)(C,N), which may add metal element X (such as Zr) to increase the melting point and decomposition temperature of the fuel, and its fuel performance ( figure 1 , figure 2 ) is also similar to the combination of carbide fuel and nitride fuel: the vapor pressure of fuel is greater than that of carbide fuel, lower than that of nitride fuel; the swelling of fuel radiation is lower than that of carbide fuel, but greater than that of nitride fuel; the thermal conductivity is also much higher At the same time, it has high temperature stability similar to oxide fuel. This new high-performance fuel is generally used in special nuclear power systems. [0003] At present, among the countries in the world...

Claims

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Application Information

Patent Timeline
10 Nov 2020
Publication
CN110156475B
IPC
C04B35/58; C04B35/622; C04B35/626; C01B21/082; C01G25/00; G21C21/02
CPC
C01B21/0828; C01G25/006; C01P2002/72; C01P2006/10; C04B35/58; C04B35/622; C04B35/62605; C04B2235/3244
Inventors
屈哲昊; 尹邦跃