新型炭材料2021，Vol.36Issue(5)：987-994,8.DOI:10.1016/S1872-5805(21)60048-3
不同温度下高温纯化后球形燃料元件A3-3基体石墨的性能和微观结构
Properties and microstructures of a matrix graphite for fuel elements of pebble-bed reactors after high temperature purification at different temperatures
摘要
Abstract
The matrix graphite (MG) of pebble fuel elements for a High Temperature Gas-cooled Reactor (HTGR), composed of 71wt％natural graphite, 18 wt％artificial graphite and 11 wt％phenolic resin-derived carbon, was purified by high temperature treat-ment (HTT), and its properties and microstructure were analyzed to investigate the effect of different HTT temperatures and optim-ize the purification temperature. Results showed that with increasing HTT temperature, its density and thermal conductivity gradu-ally increased, but pore size and d002 gradually decreased. The rate of erosion caused by friction as the fuel pebbles move in the react-or also decreased. The ash content decreased significantly from to 18.2 to 12.3×10?6 after HTT at 1600 ℃, but changed little when the HTT temperature was further increased to 1900 ℃, especially for catalytic metals such as Fe, Ni and Ca that are related to its corrosion rate. The microstructure improvement and ash content reduction at high temperatures jointly contributed to the increase in the anti-corrosion performance of MG. Based on properties such as crushing strength, erosion resistance, and corrosion rate, a HTT of 1600 ℃is adequate although the MG gradually became more ordered with a further increase of HTT temperature from 1600 to 1900℃. This determination of an appropriate HTT temperature for the production of MG for the fuel elements of an HT-GR should improve the production efficiency and reduce the mass production cost of this material for a commercial HTGR.关键词
A3-3基体石墨/热导率/腐蚀速率/高温纯化/灰分Key words
A3-3 matrix graphite/Thermal conductivity/Corrosion rate/High temperature purification/Ash content分类
化学化工引用本文复制引用
周湘文,张凯红,杨杨,王磊,张杰,卢振明,刘兵,唐亚平..不同温度下高温纯化后球形燃料元件A3-3基体石墨的性能和微观结构[J].新型炭材料,2021,36(5):987-994,8.基金项目
国家科技重大专项(ZX06901) （ZX06901）
山东省重点研发计划(重大科技创新工程,2020CXGC010306).Chinese National S&T Major Project(ZX06901) （重大科技创新工程,2020CXGC010306）
Key R&D plan of Shandong Province(major scientific and technological innovation project,2020CXGC010306). （major scientific and technological innovation project,2020CXGC010306）
