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Oxide composite nuclear fuel pellet and preparation method thereof
The invention provides a preparation method of an oxide composite nuclear fuel pellet, and belongs to the technical field of nuclear material preparation. The preparation method comprises the following steps: 1) preparing mixed powder: putting oxide nuclear fuel powder and filler powder into a ball-milling tank, adding zirconium dioxide grinding balls, mixing and carrying out ball milling; 2) compression molding: carrying out compression molding on the ball-milled mixed powder, and demolding to obtain an oxide composite nuclear fuel blank; 3) flash burning: electrifying the oxide composite nuclear fuel blank body, applying constant electric fields to two ends of the blank body, simultaneously raising the temperature, and carrying out flash burning when the flash burning temperature is met,wherein the current is a constant current of 0-700mA/mm < 2 >, the field intensity is 0-300V/cm, the flash burning temperature is 25-1000 DEG C, and the flash burning time is 0-600s; and after flashburning is completed, cooling and demolding and obtaining the oxide composite nuclear fuel pellet. According to the method, the constant direct-current electric field is applied to the two ends of theblank by utilizing a flash burning technology, so that the sintering temperature of uranium dioxide or thorium dioxide can be remarkably reduced, the sintering time is shortened and the density of the material is improved.
本发明提供一种氧化物复合核燃料芯块的制备方法，属于核材料制备技术领域。包括：1)制备混合粉料：将氧化物核燃料粉末，填料粉末装入球磨罐中，加入二氧化锆研磨球混合进行球磨；2)压制成型：将球磨后的混合粉料进行模压成型，脱膜后得到氧化物复合核燃料胚体；3)闪烧：将氧化物复合核燃料胚体通电，在坯体两端施加恒定电场，同时升高温度，当满足闪烧温度时发生闪烧；电流为0‑700mA/mm2的恒定电流，场强为0‑300V/cm，闪烧温度为25‑1000℃，闪烧时间0～600s；闪烧完成后，降温脱模，得到氧化物复合核燃料芯块。本发明利用闪烧技术，在胚体两端施加恒定直流电场，可显著降低二氧化铀或二氧化钍的烧结温度，缩短烧结时间，提高材料的致密度。
Oxide composite nuclear fuel pellet and preparation method thereof
The invention provides a preparation method of an oxide composite nuclear fuel pellet, and belongs to the technical field of nuclear material preparation. The preparation method comprises the following steps: 1) preparing mixed powder: putting oxide nuclear fuel powder and filler powder into a ball-milling tank, adding zirconium dioxide grinding balls, mixing and carrying out ball milling; 2) compression molding: carrying out compression molding on the ball-milled mixed powder, and demolding to obtain an oxide composite nuclear fuel blank; 3) flash burning: electrifying the oxide composite nuclear fuel blank body, applying constant electric fields to two ends of the blank body, simultaneously raising the temperature, and carrying out flash burning when the flash burning temperature is met,wherein the current is a constant current of 0-700mA/mm < 2 >, the field intensity is 0-300V/cm, the flash burning temperature is 25-1000 DEG C, and the flash burning time is 0-600s; and after flashburning is completed, cooling and demolding and obtaining the oxide composite nuclear fuel pellet. According to the method, the constant direct-current electric field is applied to the two ends of theblank by utilizing a flash burning technology, so that the sintering temperature of uranium dioxide or thorium dioxide can be remarkably reduced, the sintering time is shortened and the density of the material is improved.
本发明提供一种氧化物复合核燃料芯块的制备方法，属于核材料制备技术领域。包括：1)制备混合粉料：将氧化物核燃料粉末，填料粉末装入球磨罐中，加入二氧化锆研磨球混合进行球磨；2)压制成型：将球磨后的混合粉料进行模压成型，脱膜后得到氧化物复合核燃料胚体；3)闪烧：将氧化物复合核燃料胚体通电，在坯体两端施加恒定电场，同时升高温度，当满足闪烧温度时发生闪烧；电流为0‑700mA/mm2的恒定电流，场强为0‑300V/cm，闪烧温度为25‑1000℃，闪烧时间0～600s；闪烧完成后，降温脱模，得到氧化物复合核燃料芯块。本发明利用闪烧技术，在胚体两端施加恒定直流电场，可显著降低二氧化铀或二氧化钍的烧结温度，缩短烧结时间，提高材料的致密度。
Oxide composite nuclear fuel pellet and preparation method thereof
一种氧化物复合核燃料芯块及其制备方法
XU CHEN (author) / WANG LIXIAO (author) / ZHANG PENGCHENG (author) / BAI BIN (author)
2021-02-12
Patent
Electronic Resource
Chinese
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