Nanocrystalline Materials Prepared by Spark Erosion

电火花腐蚀制备纳米晶材料

• 批准号: 9119005
• 负责人: Ami Berkowitz
• 金额: $ 59.62万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-10-01 至 1995-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9119005&HistoricalAwards=false
• 关键词: Nanocrystalline; Materials; Prepared; Spark; Erosion

This project on nanocrystalline materials has three primary objectives. First, the spark erosion technique for producing nanoparticles of a very wide range of materials will be investigated and optimized for maximum yield of the desired particle sizes and compositions. Second, a variety of nanoparticle systems representing superconducting, magnetic and structural properties will be extensively characterized. Third, the consolidation of the nanoparticles into macroscopic samples retaining the unusual properties of the precursors, utilizing dynamic extrusion and shock consolidation as well as conventional processing methods, will be implemented. Using liquid dielectics, the spark erosion technique has been shown to yield high purity particles of metals, alloys, oxides, carbides, and semiconductors in sizes from nanometers to micrometers at significant production rates. Sparks erosion may be carried out also in ultrapure gases. This approach increases the performance of this method in the synthesis, treatment and subsequent handling of nanoparticles. The characterization of various types of nanoparticles produced will involve diffraction (x-ray, electron, neutron), high resolution TEM, surface analysis, as well as methods particularly suited to specific systems such as optical and Mossbauer spectroscopy, transport measurements and magnetic properties. Research is planned to demonstrate and extend the capabilities of the spark erosion method to produce economically significant quantities of various types of nanoparticles, as well as to investigate some of the unique properties of these systems in particulate and consolidated form.

这个关于纳米晶材料的项目有三个 主要目标。 第一，电火花腐蚀 用于生产非常高分子量的纳米颗粒的技术 将对各种材料进行研究， 优化以获得所需颗粒的最大产量 尺寸和组成。 第二，各种 代表超导的纳米颗粒系统， 磁性和结构特性将是 广泛的特点。 第三，巩固 将纳米颗粒放入宏观样品中 保留了前体的不寻常性质， 利用动态挤压和冲击固结 以及传统的处理方法， 切实贯彻 利用液体电介质， 侵蚀技术已经显示出高产量 金属、合金、氧化物、碳化物 半导体的尺寸从纳米到 以显著的生产率生产微米。 火花 腐蚀也可以在超纯气体中进行。 这种方法提高了 合成、处理和后续处理中的方法 纳米粒子的处理。 的表征 所产生的各种类型的纳米颗粒将涉及 衍射（x射线，电子，中子），高分辨率 TEM、表面分析以及方法 特别适用于特定的系统， 光学和穆斯堡尔光谱学，输运 测量和磁性。 计划进行研究，以证明和扩展 电火花腐蚀方法的能力， 经济上大量的各种类型 纳米粒子，以及研究一些 这些系统的独特性能， 颗粒和固结形式。