炭黑和烧结温度对内凝胶结合碳热还原工艺制备UCO复合微球的影响  

Effects of Carbon Black and Sintering Temperature on UCO Microspheres Prepared with Internal Gelation Combined with Carbothermic Reduction Process

作　　者：孙玺 马景陶[2] 邓长生[2] 赵兴宇[2] 郝少昌[2] 刘兵[2] SUN Xi;MA Jingtao;DENG Changsheng;ZHAO Xingyu;HAO Shaochang;LIU Bing(Nuclear fuel and material research department,Central research institute of state power investment corporation,Beijing 102209,China;State Key Laboratory of New Ceramics and Fine Processing,Collaborative Innovation Center of Advanced Nuclear Energy Technology,Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China)

机构地区：[1]国家电投集团科学技术研究院有限公司核燃料与材料研究所,北京102209 [2]清华大学核能与新能源技术研究院,新型陶瓷与精细工艺国家重点实验室,先进核能技术协同创新中心,北京100084

出　　处：《陶瓷学报》2020年第1期65-70,共6页Journal of Ceramics

基　　金：政府间国际科技创新合作重点专项(2016YFE0100700);国家自然科学基金(51420105006);清华大学“十三五”学科建设专项经费(2017HYYXKJS1);国家新材料生产应用示范平台(核能材料)项目(A-ZY04-201801)。

摘　　要：采用内凝胶结合碳热还原工艺制备UO2-UC复合陶瓷微球,开展了炭黑和烧结温度对UO2-UC复合陶瓷微球的影响研究。通过分散稳定性、胶液粘度以及UO2-UC烧结微球的微观结构表征,研究了两种不同炭黑对微球的影响规律,结果表明选用粒径小于1μm的炭黑制备获得的UO2-UC陶瓷微球内部的孔洞明显较小。通过DSC-TG和XRD分析研究发现UO2的碳热还原反应在1600℃开始发生。选用优选炭黑在Ar气氛1680℃烧结制备获得了球形度好、压碎强度大的UO2-UC复合陶瓷微球。UO2-UC composite ceramic microspheres were prepared by using the combination of internal gelation and carbothermal reduction process.The effects of the type of carbon black on dispersion stability,viscosity of the broth and microstructure of the UO2-UC sintered microspheres were studied.It was observed that the UO2-UC ceramic microspheres prepared with carbon black having particle size of less than 1μm possessed obviously small pores.The conversion from UO2 to UC during the heat treatment process was studied by using DSC-TG and XRD analytic techniques,revealing that UC could be formed through carbothermal reduction reaction at temperatures of≥1600℃.UO2-UC ceramic microspheres with high sphericity and high crushing strength were obtained by using the optimized carbon black at 1680℃in flowing Ar.

关 键 词：UO2-UC陶瓷微球 炭黑 烧结温度 碳热还原 

分 类 号：TQ174.75[化学工程—陶瓷工业]