Laser Processing of Carbides and Nitrides of W and Ti (REU Supplement)

该项目是关于激光诱导方法加工过渡金属 碳化物和氮化物。 这些方法，基于激光熔化和 分解，将用于产生碳化物和氮化物层 的W和Ti。 通过控制激光参数和衬底 变量，从非晶到多晶的微观结构 可以得到 激光诱导化学气相沉积将是 用于形成W和Ti的碳化物和氮化物的层和粉末。 碳化物和氮化物的化学组成和化学计量可以 通过调节组分气体的分压来控制 反应室中的物种。 这些材料将被表征为 使用TEM/STEM、Auger、西姆斯和RBS技术， 微观结构、化学组成、化学计量和均匀性。 激光诱导生长非晶碳化物和氮化物薄膜 光解分解预计具有独特的物理和 力学性能 入选影片将由 显微硬度和电阻率测量。 变化 电阻率随温度的变化将被研究为 化学计量和各种膜的微观结构。

The project is on laser-induced methods for processing transition metal carbides and nitrides. These methods, based upon laser melting and decomposition, will be used to produce layers of carbides and nitrides of W and Ti. By controlling the laser parameters and substrate variables, microstructures ranging from amorphous to polycrystalline can be obtained. The laser-induced chemical vapor deposition will be used to form layers and powders of carbides and nitrides of W and Ti. The chemical composition and stoichiometry of carbides and nitrides can be controlled by adjusting partial pressures of constituent gaseous species in the reaction chamber. These materials will be characterized using TEM/STEM, Auger, SIMS, and RBS techniques in terms of mircostructures, chemical composition, stoichiometry, and homogeniety. Amorphous films of carbides and nitrides produced by laser-induced photolytic decomposition are expected to have unique physical and mechanical properties. Selected films will be evaluated by microhardness and electrical resistivity measurements. The variation of resistivity with temperature will be studied as a function of stoichiometry and microstructure for various films.