A microwave synthesis method of uranium-zirconium carbonitride powder

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...

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Problems solved by technology

Russian research shows that: higher synthesis temperature will lead to sintering of green body, which will increase the difficulty of later crushing and milling process

[0006] From the research experience of Russia, Germany and other countries, the UO 2 , ZrO 2 , C powder mixed, carbothermal reduction nitriding reaction at 1700-2000 ° C, is the mainstream process route for preparing (U, Zr) (C, N) powder, but this process route has a low reaction temperature and is difficult to form a solid solution. The shortcoming that the green body is too high is easy to sinter and agglomerate, so it is necessary to develop a new process to overcome these shortcomings

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