Polyvinyl butyral solution bonded lead oxide ceramic for solid oxygen control and preparation method of polyvinyl butyral solution bonded lead oxide ceramic

Abstract

The invention discloses polyvinyl butyral solution bonded lead oxide ceramic for solid oxygen control and a preparation method of the polyvinyl butyral solution bonded lead oxide ceramic, and belongs to the technical field of metal ceramics. The polyvinyl butyral solution bonded lead oxide ceramic comprises PbO and a polyvinyl butyral solution, based on PbO, more than 0 wt% and less than or equal to 6 wt% of a polyvinyl butyral solution is added; the preparation method comprises the following steps: fully mixing the polyvinyl butyral solution and PbO, and uniformly grinding to obtain a mixture; pre-pressing the obtained mixture to obtain a green body, re-crushing, uniformly grinding and sieving to obtain mixed powder, placing the mixed powder in a metal mold, and pressurizing, maintaining and releasing the pressure to obtain a ceramic pressed blank; subjecting the ceramic pressed blank to glue discharging; and finally sintering and cooling to obtain the lead oxide ceramic. The lead oxide ceramic has high hardness, three-point bending strength and density and good micromorphology, can keep shape integrity under the working condition of high-temperature flow scouring of a fourth-generation lead-based fast neutron reactor, and meets the requirement of solid oxygen control.

Description

technical field [0001] The invention belongs to the technical field of cermets, and in particular relates to a polyvinyl butyral solution bonded lead oxide ceramic for solid oxygen control and a preparation method thereof. Background technique [0002] The lead-based fast neutron reactor (LFR) was rated as the first generation IV nuclear fission reactor that is expected to realize industrial demonstration and commercial application in the Generation IV Nuclear Energy System International Forum (GIF). It can be applied to power generation, low-temperature hydrogen production, seawater Various fields of industrial production such as desalination and civilian radioisotopes. At the same time, the accelerator-driven subcritical system (ADS) is internationally recognized as one of the ways to effectively transmute the spent fuel of nuclear power plants, so that some highly radioactive and long-lived elements in the spent fuel can be transmuted into low-radioactive and short-lived ...

AI Technical Summary

Problems solved by technology

Pure PbO ceramic balls are used in the MEXICO circuit of the Belgian National Center for Nuclear Energy Research (SCK.CEN) for solid oxygen control. Cracks appear at the equator of the sphere, which cannot maintain the integrity of the shape, (A.Marino, J.Lim, S.Keijers, et al.: Design and test of a mass exchanger for oxygen control in liquid lead bismuth eutectic, In: 12th International Workshop on Spallation Materials Technology, 19-23 October, 2014)

[0005] Japanese scholar Kondo et al. directly compressed pure PbO powder and sintered it at 800°C, then smashed the sintered PbO ceramics, and screened PbO fragments with a certain geometric size for solid oxygen control. The texture of PbO ceramics made by PbO ceramics is relatively loose and low in density, so it cannot stably act as an oxygen source in a liquid lead-bismuth circuit. See the reference MKondo, M Takahashi, K Miura, T Onizawa: Study on control of oxygen concentration in lead–bismuth flow using lead oxide particles. "Journal of Nuclear Materials", 2006, 357(1–3):97-104

[0006] The prior art once added a certain proportion of Pb powder or Bi to PbO powder 2 o 3 Metal-toughened PbO ceramics were obtained from the powder, which improved the mechanical properties and microstructure of the ceramics to varying degrees. However, none of the sintered PbO ceramics was placed in high-temperature liquid lead-bismuth for scouring experiments to verify its use in solid-state oxygen control. Reliability, see invention patents CN2016102325929, 2018105001460

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