Si+自注入Si晶体中缺陷分布的计算模拟

在两体近似碰撞模型基础上,采用SRIM程序对自注入硅离子及其造成的损伤在样品的分布进行了研究,模拟了Si<'+>自注入si晶体的Si<'+>深度分布几率和注入时的能量传递.计算结果表明:在相同注入能量的情况下,注入Si<'+>的分布概率是恒定的,在注入过程中电离能是阻止Si<'+>进一步深入的主导因素.论文还初步讨论了...     

复合材料液体模塑成型技术(LCM)的研究进展

LCM是近些年发展起来的一类复合材料成型技术。它的出现打破了长久以来高性能复合材料必然具有制造成本高的惯例,为高性能复合材料开辟了广阔的应用领域。LCM工艺技术是先进复合材料低成本制备技术的主要发展方向,是现在复合材料领域研究的重点。LCM成型技术主要包括:RTM、VARTM、SCRIMP、RFI、SRIM。主要综述了这几种常见的LCM工艺各自的发展现状、成型原理、特点、存在的问题以及解决对策。     

用组合叠层CR-39固体径迹探测器测量加速器厚铍靶9Be(d,n)反应中子能谱

采用组合叠层CR-39固体径迹探测器实验方法测量了加速器D（d,n）反应产生的5MeV与2MeV准单能中子能谱。进而测量了入射氘离子能量为3MeV时加速器厚铍靶9Be（d,n）反应的中子能谱,与已有的飞行时间法的测量结果基本相符。在此基础上,用该法又测量了入射氘离子能量为1．5MeV时加速器厚铍靶9Be（d,n）反应的中子能谱,结果符合较低能量氘离子与厚铍靶发生9Be（d,n）的核反应的物理过程。     

低能质子辐射硬质硼硅玻璃的模拟计算

为获得低能质子辐射时硬质硼硅玻璃的损伤特征,利用蒙特卡罗(MC)计算程序--SRIM模拟了入射质子在硬质硼硅玻璃中产生的电离和非电离能损.模拟结果表明:能量为40～200 keV的质子损伤主要发生在表面;电离能损是能量损失的主要形式,峰值能量为80 keV;非电离能损随能量降低而增大,导致氧、硅和硼等空位型缺陷的产生;...     

Nano-scopic measurement for radiation of nuclear waste forms using ion beam injection in the drum treatment

The irradiation-induced nuclear waste material has been investigated. Alpha particles are considered as the waste radiation. The material aspects are considered for four kinds of materials, which are used for the nuclear waste forms. These materials are compared for the possibility of the irradiation-induced amorphization. Several variables are investigated for the ion radiation interactions. We have used the Stopping and Range of Ion in Matter 2008 (SRIM 2008) code system to show that the ion dose is changed to the displacement per atom (dpa) completely and the kinetic energy is transferred to each target atom through nuclear collision. The necessary thickness of the waste form has been investigated. More reasonable study has been done for the nuclear waste material container. The thickness of 204 nm is considered for the optimized structure of waste drum by crystalline silicotitanate.     

Low-energy atomic displacement model of SRIM simulations

Radiation-induced atomic displacement damage is a pressing issue for materials.The present work inves-tigates the number of atomic displacements using the Pri-mary Knock-on Atom(PKA)energy EPKA and threshold displacement energy Ed as two major parameters via low-energy SRIM Binary Collision Approximation(BCA)full cascade simulations.It is found that the number of atomic displacements cannot be uniquely determined by EPKA/Ed or ED/Ed(ED refers to the damage energy)when the energy is comparable with Ed.The effective energy ED,eff pro-posed in the present work allows to describing the number of atomic displacements for most presently studied mona-tomic materials by the unique variable ED,eff/Ed.Never-theless,it is noteworthy that the BCA simulation damage energy depends on Ed,whereas the currently used analyt-ical method is independent of Ed.A more accurate ana-lytical damage energy function should be determined by including the dependence on Ed.     

低密度长玻璃纤维增强PU-RIM材料制备研究

对低密度长玻璃纤维注射工艺(LFI)用聚氨酯材料的配方、工艺条件和制品性能进行了研究。得出较佳配方(质量份)为:聚醚多元醇(平均官能度4左右)100,复配延迟催化剂YC-10.8,水0.6￣1.0,物理发泡剂5￣8,泡沫稳定剂B88701.0￣2.0,异氰酸酯指数1.05￣1.15;工艺条件为:料温35℃左右,模具温度50￣55℃,脱模时间4.5￣5min。     

结构反应注射成型(SRIM)—─PU-PI增强塑料的研制及性能研究

在研究结构反应注射成型（ＳＲＩＭ）化学体系的基础上，以玻璃纤维毡片为增强剂，预先配制在模具中，然后进行反应注射成型的新技术－ＳＲＩＭ技术，研究制备了氨酯改性聚异氰脲酸酯（ＰＵ－ＰＩ）增强塑料（ＳＲＩＭＰＵ－ＰＩ）。