分析了新型光电器件在常规空间辐射环境下,电子器件所产生的一系列位移型损伤及对应成因。经多次对比实验发现,其位移损伤和器件失效主要由非电离能损(NIEL)所诱发。其根本损耗来源为:在低能空间状态下,库仑间的相互作用力将凸显,并逐...分析了新型光电器件在常规空间辐射环境下,电子器件所产生的一系列位移型损伤及对应成因。经多次对比实验发现,其位移损伤和器件失效主要由非电离能损(NIEL)所诱发。其根本损耗来源为:在低能空间状态下,库仑间的相互作用力将凸显,并逐渐占据主导地位。而当前主要采用的散射微分截面法,如Mott-Rutherford型散射法,均无法有效屏蔽核外电子间存在的库仑作用力影响,从而导致大量非电离能损产生。由此,文中结合非电离能损特性及成因,在解析算法基础上结合Monte-Carlo推衍方法,以SRIM程序模拟并推算出较精确的低能质子在半导体材料(以Si、Ga AS为例)中的NIEL数值量级,同时参照薄靶近似思想改良实验。实验数据规律表明,能量总值为1 ke V的低能质子材料中NIEL评测数值量级大约为Ga As质子材料的1/5、Summers数值量级的1/3,这一结果将为航天材质设计和改良提供重要的参考。展开更多
The Fe40Mn40Cr10Co10/TiC (volume fraction of TiC, 10%) composites were synthesized in combination of ball milling and spark plasma sintering (SPS) in the present work. Mechanical properties and wear resistance of the ...The Fe40Mn40Cr10Co10/TiC (volume fraction of TiC, 10%) composites were synthesized in combination of ball milling and spark plasma sintering (SPS) in the present work. Mechanical properties and wear resistance of the Fe40Mn40Cr10Co10/TiC composites were individually investigated. It was found that TiC particles homogenously distributed in the Fe40Mn40Cr10Co10/TiC composite after being sintered at 1373 K for 15 min. Meanwhile, grain refinement was observed in the as-sintered composite. Compared with the pure Fe40Mn40Cr10Co10 medium entropy alloy (MEA) matrix grain, addition of 10% TiC particles resulted in an increase in the compressive strength from 1.571 to 2.174 GPa, and the hardness from HV 320 to HV 872. Wear resistance results demonstrated that the friction coefficient, wear depth and width of the composite decreased in comparison with the Fe40Mn40Cr10Co10 MEA matrix. Excellent mechanical properties and wear resistance could offer the Fe40Mn40Cr10Co10/TiC composite a very promising candidate for engineering applications.展开更多
The energy loss of charged particles, including electrons, protons, and α-particles with tens keV initial energy E0, traveling in the hot dense carbon(C) plasma for densities from 2.281 to 22.81 g/cm3 and temperature...The energy loss of charged particles, including electrons, protons, and α-particles with tens keV initial energy E0, traveling in the hot dense carbon(C) plasma for densities from 2.281 to 22.81 g/cm3 and temperatures from 400 to 1500 eV is systematically and quantitatively studied by using the dimensional continuation method. The behaviors of different charged particles are readily distinguishable from each other. Firstly, because an ion is thousands times heavier than an electron, the penetration distance of the electron is much longer than that of proton and α-particle traveling in the plasma. Secondly, most energy of electron projectile with E0 < 100 keV deposits into the electron species of C plasma, while for the cases of proton and α-particle with E0 < 100 keV,about more than half energy transfers into the ion species of C plasma. A simple decreasing law of the penetration distance as a function of the plasma density is fitted, and different behaviors of each projectile particle can be clearly found from the fitted data.We believe that with the advanced progress of the present experimental technology, the findings shown here could be confirmed in ion-stopping experiments in the near future.展开更多
文摘分析了新型光电器件在常规空间辐射环境下,电子器件所产生的一系列位移型损伤及对应成因。经多次对比实验发现,其位移损伤和器件失效主要由非电离能损(NIEL)所诱发。其根本损耗来源为:在低能空间状态下,库仑间的相互作用力将凸显,并逐渐占据主导地位。而当前主要采用的散射微分截面法,如Mott-Rutherford型散射法,均无法有效屏蔽核外电子间存在的库仑作用力影响,从而导致大量非电离能损产生。由此,文中结合非电离能损特性及成因,在解析算法基础上结合Monte-Carlo推衍方法,以SRIM程序模拟并推算出较精确的低能质子在半导体材料(以Si、Ga AS为例)中的NIEL数值量级,同时参照薄靶近似思想改良实验。实验数据规律表明,能量总值为1 ke V的低能质子材料中NIEL评测数值量级大约为Ga As质子材料的1/5、Summers数值量级的1/3,这一结果将为航天材质设计和改良提供重要的参考。
基金Project(51404302)supported by the National Natural Science Foundation of China
文摘The Fe40Mn40Cr10Co10/TiC (volume fraction of TiC, 10%) composites were synthesized in combination of ball milling and spark plasma sintering (SPS) in the present work. Mechanical properties and wear resistance of the Fe40Mn40Cr10Co10/TiC composites were individually investigated. It was found that TiC particles homogenously distributed in the Fe40Mn40Cr10Co10/TiC composite after being sintered at 1373 K for 15 min. Meanwhile, grain refinement was observed in the as-sintered composite. Compared with the pure Fe40Mn40Cr10Co10 medium entropy alloy (MEA) matrix grain, addition of 10% TiC particles resulted in an increase in the compressive strength from 1.571 to 2.174 GPa, and the hardness from HV 320 to HV 872. Wear resistance results demonstrated that the friction coefficient, wear depth and width of the composite decreased in comparison with the Fe40Mn40Cr10Co10 MEA matrix. Excellent mechanical properties and wear resistance could offer the Fe40Mn40Cr10Co10/TiC composite a very promising candidate for engineering applications.
基金supported by the National Natural Science Foundation of China(Grant Nos.11575032,11274049,U1530258,11205019 and11304009)the National Magnetic Confinement Fusion Energy Research Project of China(Grant No.2015B108002)+1 种基金the Presidential Foundation of China Academy of Engineering Physics(CAEP)(Grant No.YZ2015014)the Foundation for the Development of Science and Technology of CAEP(Grant No.2014B0102015)
文摘The energy loss of charged particles, including electrons, protons, and α-particles with tens keV initial energy E0, traveling in the hot dense carbon(C) plasma for densities from 2.281 to 22.81 g/cm3 and temperatures from 400 to 1500 eV is systematically and quantitatively studied by using the dimensional continuation method. The behaviors of different charged particles are readily distinguishable from each other. Firstly, because an ion is thousands times heavier than an electron, the penetration distance of the electron is much longer than that of proton and α-particle traveling in the plasma. Secondly, most energy of electron projectile with E0 < 100 keV deposits into the electron species of C plasma, while for the cases of proton and α-particle with E0 < 100 keV,about more than half energy transfers into the ion species of C plasma. A simple decreasing law of the penetration distance as a function of the plasma density is fitted, and different behaviors of each projectile particle can be clearly found from the fitted data.We believe that with the advanced progress of the present experimental technology, the findings shown here could be confirmed in ion-stopping experiments in the near future.
