Multi-Scale Study of Nanoparticle Sintering

纳米颗粒烧结的多尺度研究

• 批准号: 0969888
• 负责人: Kathy Lu
• 金额: $ 25.7万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-07-01 至 2014-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0969888&HistoricalAwards=false
• 关键词: Multi; Scale; Study; Nanoparticle; Sintering

This grant provides funding for a nanoparticle sintering study across multi-scales through quantifying three-dimensional (3D) structural evolution of different nanoparticle packings and connecting the microstructural characteristics with macroscopic shrinkage. The primary issues to be addressed are particle agglomeration, excessive grain growth, complex nano-/micro-structural evolution, and non-uniform shrinkage. Sintering is a high temperature process whereby particles, in this case nanoparticles (with diameters less than 100 micrometers), are consolidated into solid form. The process involves multi-scale events that range from atomic diffusion to macroscopic shrinkage and creates stable nanostructures for long term use. Experiments will be carried out to create homogeneous and agglomerated titanium dioxide and zirconium dioxide nanoparticle packing structures across all scales. The resulting nanostructure will be quantitatively described and correlated with grain growth and macroscopic shrinkage through nanostructural electron tomography and focused ion beam 3D rendering. If successful, the results of this research will provide understanding to the key issues in nanoparticle sintering. These include the effects of different nanoparticle packings, excessive grain growth, complex nano-/micro-structural evolution, and non-uniform shrinkage. The team will develop theories that link nano-/micro-structural evolution and macroscopic densification throughout the entire sintering process. The integrated understanding across multi-scales will provide comprehensive sintering knowledge and enable the field to challenge the heretofore-accepted sintering theories and perspectives. With proper adjustment, the methodology and breakthrough can also be applied to conventional micron-sized particle sintering which has numerous applications. New theory-guided sintering processes resulting from this program will also allow for more energy efficient sintering practices. The research methodology has wide-ranging significance in multi-scale device integration while improving process reliability and manufacturability.

该赠款通过量化不同纳米颗粒填料的三维（3D）结构演化并将微观结构特征与宏观收缩联系起来，为多尺度的纳米颗粒烧结研究提供资金。要解决的主要问题是颗粒团聚、晶粒过度生长、复杂的纳米/微米结构演变和不均匀收缩。烧结是一种高温过程，颗粒（在本例中为纳米颗粒（直径小于 100 微米））被固结成固体形式。该过程涉及从原子扩散到宏观收缩的多尺度事件，并创建可供长期使用的稳定纳米结构。将进行实验以创建各种规模的均匀和团聚的二氧化钛和二氧化锆纳米粒子堆积结构。通过纳米结构电子断层扫描和聚焦离子束 3D 渲染，对所得纳米结构进行定量描述，并将其与晶粒生长和宏观收缩相关联。如果成功，这项研究的结果将为人们理解纳米颗粒烧结的关键问题提供帮助。这些包括不同纳米粒子堆积、过度晶粒生长、复杂纳米/微米结构演变和不均匀收缩的影响。 该团队将开发在整个烧结过程中将纳米/微观结构演化与宏观致密化联系起来的理论。跨多尺度的综合理解将提供全面的烧结知识，并使该领域能够挑战迄今为止公认的烧结理论和观点。通过适当的调整，该方法和突破也可以应用于具有广泛应用的传统微米级颗粒烧结。该计划产生的新的理论指导烧结工艺也将实现更节能的烧结实践。该研究方法在多尺度器件集成方面具有广泛的意义，同时提高了工艺可靠性和可制造性。