Acquisition of a Laser Engineered Net Shaping (LENS) System for Research and Education in Nanostructured Materials Manufacturing

该合同授予加州大学欧文分校，用于获得激光工程净成形（LENSTM 750型）工艺设备，用于直接制造纳米结构涂层/层压复合材料。LENS工艺利用计算机辅助设计实体模型来自动控制具有合理复杂特征的功能性，近净形状，全致密涂层金属零件的制造。此外，与传统工艺和快速成型（RP）技术相比，LENSTM技术在直接制造组件方面的灵活性是独一无二的，包括创建“嵌入式”结构的能力，与同类锻造材料相比优越的材料性能，以及最小的浪费。该研究将基于对相关基本现象的坚定和详细的理解，确定纳米结构涂层/层压复合材料制造的基本问题。一个例子是某些类型的纳米结构材料固有的不寻常的热稳定性。在纳米结构涂层和/或层状结构材料制造的LENSTM技术的关键问题将解决。通过改变粉末混合物和使用多个粉末给料机，LENSTM设备将用于从各种材料制造功能梯度涂层和层压复合材料。PI将制造功能梯度纳米结构涂层/层压板，并研究相关的基本现象（即界面键合，热应力，晶粒尺寸和生长）以及机械性能。这是一份授予加州大学欧文分校的仪器采购合同。Lavernia教授和合作者将购买一台750型的LENSTM，用于激光工程净成形工艺，用于直接制造纳米结构涂层/层压复合材料。近年来，人们对纳米结构（也称为纳米晶、纳米相或纳米尺度）材料的研究产生了极大的兴趣，这些材料的晶粒尺寸通常在1-100纳米之间。当晶粒尺寸足够小时，纳米晶材料中超过50%体积的原子可能与晶界或界面边界有关。因此，与晶界相关的相邻原子之间的大量界面成分有助于纳米晶材料的物理性质。对这类材料的兴趣是由其不同寻常的物理特性驱动的，例如非常高的强度和热稳定性。就纳米结构涂层而言，其潜在的应用范围涵盖了从涡轮叶片热障涂层到耐磨旋转部件的整个技术领域。新工具将加强UCI本科生和研究生的跨学科培训。

0076498 LaverniaThis award to the University of California at Irvine is for the acquisition an equipment for Laser Engineered Net Shaping (LENSTM model 750) process, for the direct fabrication of nanostructured coatings/laminate composites. The LENS process utilizes computer-aided design solid models to automatically control the manufacture of functional, near-net shape, fully dense coatings metallic parts with reasonably complex features. Moreover, the LENSTM technique is unique in its flexibility for the direct fabrication of a component over conventional processing as well as Rapid Prototyping (RP) technologies, including the ability to create an "embedded" structure, superior material properties for a comparable wrought material, and minimum waste. The research will establish the fundamental issues underlying the fabrication of nanostructured coatings/laminate composites based one firm and detailed understanding of the relevant fundamental phenomena. One example is the unusual thermal stability inherent to certain types of nanostructured materials. Critical issues in nanostructured coating and/or layered structural materials fabricated by LENSTM technology will be addressed. By varying powder mixture and using multiple powder feeders, the LENSTM facility will be used to fabricate a functionally gradient coating and laminate composites from a variety of materials. The PI 's will fabricate functionally gradient nanostructured coatings/laminates, and investigate the related fundamental phenomena (i.e., interfacial bonding, thermal stress, and grain size and growth) as well as mechanical properties will be investigated.%%%This is an instrument acquisition award to the University of California at Irvine. Professor Lavernia and collaborators will purchase a LENSTM model 750 for Laser Engineered Net Shaping process, for the direct fabrication of nanostructured coatings/laminate composites. Significant interest has been generated recently in the field of nanostructured (also described as nanocrystalline, nanophase, or nanoscale) materials, in which the grain size is usually in the range of 1-100 nanometers. More than 50 volume percent of atoms in nanocrystalline materials may be associated with grain boundaries or interfacial boundaries when the grain size is small enough. Thus, a significant amount of interfacial component between neighboring atoms associated with grain boundaries contributes to the physical properties of nanocrystalline materials. Interest in this class or materials is driven by their unusual physical properties, such as a very high strength and thermal stability. In the case of nanostructured coatings, the potential applications span the entire spectrum of technology, from thermal barrier coatings for turbine blades to wear resistant rotating parts. The new instrument will strengthen the interdiciplinary training of undergraduate and graduate students at UCI.