原子能科学技术
原子能科學技術
원자능과학기술
Atomic Energy Science and Technology
2015年
11期
1972-1976
,共5页
多壁碳纳米管%UO2%复合燃料%热压烧结%无压烧结
多壁碳納米管%UO2%複閤燃料%熱壓燒結%無壓燒結
다벽탄납미관%UO2%복합연료%열압소결%무압소결
MWNTs%UO2%composite fuel%hot-press sintering%pressureless sintering
分别采用热压烧结与无压烧结工艺制备了掺杂5%~20%多壁碳纳米管(MWNTs)的 UO2复合燃料芯块,分析了芯块的性能。结果表明：乙醇湿法球磨可将 MWNTs均匀分散到 UO2基体中；热压烧结芯块随 MWNTs含量的增加,芯块密度逐渐下降,MWNTs含量为5%的芯块密度为96.7%TD；无压烧结芯块随 MWNTs含量的增加,芯块密度先升高后降低,MWNTs 含量为12.5%的芯块密度最高,为97.2%TD；1400℃、50 MPa热压烧结工艺,MWNTs与 UO2基体未发生反应；1750℃无压烧结工艺, MWNTs与 UO2基体产生微弱反应生成少量 UC相；SEM显示,MWNTs在 UO2基体以沿晶和穿晶状态分布；在250℃,热压烧结 UO2-10%MWNTs芯块热导率为6.76 W/(m·K),提高了20.28%；无压烧结 UO2-12.5%MWNTs芯块热导率为6.65 W/(m·K),提高了18.33%。
分彆採用熱壓燒結與無壓燒結工藝製備瞭摻雜5%~20%多壁碳納米管(MWNTs)的 UO2複閤燃料芯塊,分析瞭芯塊的性能。結果錶明：乙醇濕法毬磨可將 MWNTs均勻分散到 UO2基體中；熱壓燒結芯塊隨 MWNTs含量的增加,芯塊密度逐漸下降,MWNTs含量為5%的芯塊密度為96.7%TD；無壓燒結芯塊隨 MWNTs含量的增加,芯塊密度先升高後降低,MWNTs 含量為12.5%的芯塊密度最高,為97.2%TD；1400℃、50 MPa熱壓燒結工藝,MWNTs與 UO2基體未髮生反應；1750℃無壓燒結工藝, MWNTs與 UO2基體產生微弱反應生成少量 UC相；SEM顯示,MWNTs在 UO2基體以沿晶和穿晶狀態分佈；在250℃,熱壓燒結 UO2-10%MWNTs芯塊熱導率為6.76 W/(m·K),提高瞭20.28%；無壓燒結 UO2-12.5%MWNTs芯塊熱導率為6.65 W/(m·K),提高瞭18.33%。
분별채용열압소결여무압소결공예제비료참잡5%~20%다벽탄납미관(MWNTs)적 UO2복합연료심괴,분석료심괴적성능。결과표명：을순습법구마가장 MWNTs균균분산도 UO2기체중；열압소결심괴수 MWNTs함량적증가,심괴밀도축점하강,MWNTs함량위5%적심괴밀도위96.7%TD；무압소결심괴수 MWNTs함량적증가,심괴밀도선승고후강저,MWNTs 함량위12.5%적심괴밀도최고,위97.2%TD；1400℃、50 MPa열압소결공예,MWNTs여 UO2기체미발생반응；1750℃무압소결공예, MWNTs여 UO2기체산생미약반응생성소량 UC상；SEM현시,MWNTs재 UO2기체이연정화천정상태분포；재250℃,열압소결 UO2-10%MWNTs심괴열도솔위6.76 W/(m·K),제고료20.28%；무압소결 UO2-12.5%MWNTs심괴열도솔위6.65 W/(m·K),제고료18.33%。
UO2 composite fuel pellets doped with 5%-20% multi-walled carbon nano-tubes (MWNTs)were prepared by hot-press and pressureless sintering processes,and their properties were studied.The results show that MWNTs are uniformly mixed into the UO2 matrix by alcohol ball milling;the density of hot-press sintered UO2 pellet decreases with increase of MWNTs content,the density of UO2-5%MWNTs pellet is 9 6.7%TD;the density of pressureless sintered UO2 pellet first increases then decreases with increase of MWNTs content,and the maximum density of UO2-1 2.5%MWNTs is 97.2%TD.MWNTs and UO2 do not react at 1 400 ℃,50 MPa hot-press sintering process,but a little reaction and UC phase are found at 1 750 ℃ pressureless sintering process.SEM shows that MWNTs distributes in UO2 matrix as intergranular and trans-granular.At 250 ℃,the thermal conductivity of UO2-10%MWNTs pellet by hot-press sintering is 6.76 W/(m·K),increased by 20.28%;the thermal conductivity of UO2-12.5%MWNTs pellet by pressureless sintering is 6.65 W/(m · K),increased by 18.33%.
