Thickness distribution of large scale metallic sheet by EB-PVD on rotating substrate

A two-dimensional kinetic Monte-Carlo(KMC) method was used to approach the thickness distribution of large scale metallic sheet deposited by electron beam physical vapor deposition(EB-PVD) on rotating substrate. The KMC model involves incident atom attachment, adatom diffusion and adatom detachment. The effective deposition rate and effective incident angle along substrate radial were studied as influencing factors of sheet thickness distribution. The KMC simulation results indicate that incident angle is a very important factor to affect the sheet thickness distribution as well as theory deposition mass. The experiments results show that the KMC model can predict the thickness distribution of large scale sheet deposited by EB-PVD on rotating substrate.

急倾斜厚大金属矿山地下开挖岩移发生机理

文章以金川二矿区的岩体移动为例,对急倾斜厚大金属矿山的岩体移动这一重大工程难题进行了探讨。分析了急倾斜金属矿山开挖引起岩体移动的概化传递模式及其地表岩移显现特征。结合数值模拟及GPS监测分析结果,对厚大急倾斜金属矿山岩移发生机理进行研究。结果表明,急倾斜金属矿的厚度对地表岩移的显现特征具明显的影响。当对厚大矿体进行薄层开采时,较大幅度的岩体移动主要发生在采空区顶、底板,开采引起岩体移动的地表显现特征类似于水平矿体的开采;而当采空区的高度大于整个矿体的厚度时,采空区两侧的岩体位移逐渐增大到占主导地位。岩体移动的地表显现特征开始表现为急倾斜矿体开挖的岩体移动特征。