摘要:
连续碳纤维增强碳化硅材料除了具有碳化硅材料固有的低中子活化性能,低衰变热性能和低氚渗透性能等优点以外,还具有密度低、线性膨胀系数小、高比强度、高比模量、耐高温、抗氧化、抗蠕变、抗热震、耐化学腐蚀、耐盐雾、优良的电磁波吸收特性等一系列优异性能,是各类核工程重要的潜在候选材料.在核聚变工程应用领域,连续碳纤维增强碳化硅材料作为第一壁材料不可避免地会受到各种辐射粒子的影响.研究清楚这些辐射粒子对它的辐照效应对其在核工程领域的安全使用至关重要.采用蒙特卡罗方法与分子动力学方法进行模拟计算,研究了氕、氘、氚和氦四种粒子对连续碳纤维增强碳化硅的辐照效应.SRIM和LAMMPS计算结果表明:当入射原子能量为100 eV,连续碳纤维增强碳化硅中碳的浓度在80％～85％时,氕、氘、氚和氦原子的溅射率存在最小值;入射粒子的种类对溅射率的影响显著,氦原子的溅射率大于氘原子和氚原子,而氘原子和氚原子的溅射率相差不大但均显著大于氕原子;溅射率随入射能量的增加先迅速增加后逐渐减小,氕、氘、氚和氦原子入射能量分别在200,400,600和800 eV时存在溅射率最大值;当氦原子入射能量为100 eV时,溅射率随入射角度的增加而逐渐减少.这些结果对连续碳纤维增强碳化硅材料在核工程上的应用具有一定的参考意义.
Abstract:
Continuous carbon fiber reinforced silicon carbide material has the low neutron activation,low decay heat performance and tritium permeability,which are inherent performance of silicon carbide materials.It also has other advantages such as low density,small linear expansion coefficient,specific strength and specific modulus,high temperature resistance,oxidation resistance,creep resistance,thermal shock,resistance to chemical corrosion,salt fog resistance,excellent electromagnetic wave absorption properties,etc.It is an important potential candidate material in various field of nuclear engineering.In the field of nuclear fusion engineering applications,continuous carbon fiber reinforced silicon carbide as the first wall material will inevitably be bombarded by a variety of radiation particles.The radiation effect is critical to its safe use in nuclear engineering.The Monte Carlo method and the molecular dynamics method were used to study the radiation effect of protium,deuterium,tritium and helium on continuous carbon fiber reinforced silicon carbide.The SRIM and LAMMPS simulation results show that when the incident energy is 100 eV and the concentration of carbon in the continuous carbon fiber reinforced silicon carbide is about 80％ ～ 85％,the sputtering yield of protium,deuterium,tritium and helium atoms have the minimum values.The kind of incident particle has a significant effect on the sputtering yield.The sputtering yield of helium atoms is larger than that of tritium atoms and deuterium atoms.There is not much difference between the sputtering yield of deuterium atoms and tritium atoms,and both the sputtering yield of deuterium atoms and tritium atoms are larger than that of protium atoms.The sputtering yield initially increases rapidly with the increase of the incident energy and then decreases gradually.The incident energy of the protium,deuterium,tritium and helium atoms has the maximum value of the sputtering yield at 200,400,600 and 800 eV,respectively.When the incident energy of helium atoms is 100 eV,the sputtering yield decreases while the increase of the incident angle.These results can provide a certain reference for the application of continuous carbon fiber reinforced silicon carbide materials in nuclear engineering.
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