溶胶凝胶法制备U-Zr-Hf可燃毒物燃料主要影响因素研究

Research of Main Influencing Factors during Sol-Gel Preparing Process of U-Zr-Hf Burable Poison Fuel

为研制辐照稳定性良好的整体型可燃毒物燃料,采用溶胶凝胶法制备U-Zr-Hf燃料,可实现可燃毒物与燃料的均布。本文研究了溶胶配制、分散胶凝、凝胶球洗涤、还原烧结过程的主要因素对燃料制备及性能的影响。结果表明:金属总离子浓度是在低温下导致溶胶粘度增加的主要原因;溶胶内金属离子体系是胶凝过程中影响稳定分散温度的主要因素;洗液与凝胶球体积比直接影响洗涤效果;烧结温度的增加促进了燃料的致密化,从U-Zr-Hf燃料的金相磨面照片可看出燃料表观完整,无破裂,内部致密。

For the development of the integrated type burnable poison fuel with good irradiation stability,the U-Zr-Hf burnable poison fuel was prepared by sol-gel method,which can achieve the uniform distribution of burnable poison and fuel.Effect of the main influencing factors in preparation of broth,broth droplet gel-forming,gel particles washing and reduction sintering on preparation process and performance of fuel was studied.The results showed that:the total concentration of metal ions was the main reason for the viscosity increasing at low temperature.And the main factor for steady broth droplet gel-forming temperature was the metal ions system.The volume ratio of washing liquid and gel particles affected the washing process.The increasing of sintering temperature promoted the densifying of fuels.The metallographic surface photos of U-Zr-Hf fuel showed that the fuel was apparent integrity,with no rupture,and internal compactness.