Field emission scanning electron microscope

增材制造中的材料开发需要一种场发射扫描电子显微镜（FESEM）。该装置将被集成为粉末基材料开发实验室的中心元件。开发用于增材制造的新材料必不可少的第一步是研究微观结构特性，如增材制造材料的成分依赖相形成和转变。由于增材制造工艺的独特工艺环境，也可以创建最小的颗粒尺寸到玻璃状状态，以及高度纹理的材料。对于利用基于粉末喷嘴和粉末床工艺的增材制造技术的特点开发新材料来说，能够详细研究最精细的微结构部件是必不可少的。材料科学和增材制造主席的研究重点之一是开发基于金属间化合物和镍基合金体系的部分高度复杂的高温合金。由于增材制造工艺的高冷却速率以及由逐层结构引起的本征热处理的影响，材料状态通常以不平衡状态产生，而不是由相图表示。另一个重点是开发使用自合成纳米颗粒的材料，以各种方式修改打印材料的性能，包括纳米颗粒-聚合物复合材料。BUW系统研究复合材料和合金成分的能力将为成分-性能相关性提供广泛的新科学见解；鉴于能够以有针对性的方式开发特定应用的材料解决方案的目标，这一点尤为重要。通过添加分辨率在个位数纳米范围内的高性能扫描电子显微镜，低压模式和相应的分析（能量色散x射线光谱（EDX）和电子背散射衍射（EBSD）），使用纳米颗粒添加剂和本征相形成的新型金属和聚合物材料的基础研究和开发可以得到显著扩展，并且可以实现对增材制造过程中特殊热物理凝固条件下成分依赖相形成的理解的实质性深化。因此，所提出的设备在伍珀塔尔大学材料科学与增材制造主席的材料科学研究领域占据了关键地位。

A field emitter scanning electron microscope (FESEM) is requested for materials development in additive manufacturing. The device is to be integrated as a central element in the laboratory for powder-based materials development. An essential first step in the development of new materials for additive manufacturing is the investigation of microstructural properties such as composition-dependent phase formation and transformation of additively manufactured materials. Due to the unique process environments of additive manufacturing processes, it is also possible to create the smallest grain sizes down to glass-like states, as well as highly textured materials. For the development of new materials, which use the characteristic process features of additive manufacturing technologies based on powder nozzle as well as powder bed processes, it is indispensable to be able to investigate the finest microstructural components in detail. One focus of the research of the Chair of Materials Science and Additive Manufacturing is the development of partly highly complex high-temperature alloys based on intermetallic and Ni-based alloy systems. Due to the characteristically high cooling rates of additive manufacturing processes as well as the influence of intrinsic heat treatment caused by the layer-by-layer structure, material states are typically generated in disequilibrium states not represented by phase diagrams. Another focus is on the development of materials using self-synthesized nanoparticles to modify the properties of printed materials, including nanoparticle-polymer composites, in a variety of ways. The ability to systematically study composite and alloy compositions at BUW will provide extensive new scientific insight into composition-property correlations; which is particularly important in light of the goal of being able to develop application-specific material solutions in a targeted manner. By adding a high-performance scanning electron microscope with resolution in the single-digit nanometer range, low-pressure mode and corresponding analytics (energy dispersive X-ray spectroscopy (EDX) and electron backscatter diffraction (EBSD)), the fundamental research and development of new metallic and polymeric materials using nanoparticulate additives and intrinsically formed precipitates can be significantly extended and a substantial deepening of the understanding of composition-dependent phase formation under the special thermophysical solidification conditions during AM can be achieved. The proposed device thus occupies a key position for the materials science research spectrum of the Chair of Materials Science and Additive Manufacturing and the University of Wuppertal.