【摘要】 用煅烧石油焦作填料、煤沥青作粘结剂和B4C、Si、Ti作添加剂,利用热压工艺制备了系列重结晶掺杂石墨,并通过化学气相反应法在掺杂石墨表面沉积了有梯度的SiC涂层。对掺杂石墨的热力学性能、微观结构及在HT-7装置的聚变环境中的行为进行了考察。结果表明:与纯石墨材料相比,掺杂了10%的B4C的重结晶石墨力学性能得到明显的改善,抗弯强度达104Mpa,但导热性能较差;掺杂了Si、Ti的重结晶石墨的热导率高,达314W.m-1.K-1,但力学性能较差;掺杂了BSTDG的石墨在聚变环境中的抗等离子体辐照能力明显提高;在HT-7装置中经过一轮实验的辐照后,SiC涂层厚度因等离子体的刻蚀由初期的40～50μm下降至5μm左右,且局部区域涂层剥落。更多还原

【Abstract】 The recrystallized graphites were prepared with calcined coke filler,coal-tar pitch binder and additives of B4C、Si、Ti by the hot-pressing in order to investigate the thermo-mechanical properties and microstructure of the recrystallized graphites.Radiation damages of the recrystallized graphites by ion bombardment in HT-7 fusion environment were also studied.The experimental results showed that the recrystallized graphites doped 10%B4C exhibited higher bending strength,up to 104Mpa,but lower thermal conductivity;on the contrary,the recrystallized graphites doped Si and Ti exhibited higher thermal conductivity but lower bending strength.Compared with pure graphite,the erosion-resistant of the recrystallized graphites was improved obviously.The thickness of the gradient SiC coating of BSTDG was thinned from 40～50μm to 5μm,and the coating flaked off partially after irradiation in HT-7 tokamak.更多还原