Synthesis of Ultrafine Particles of Nanosize Reinforced Composites

该项目调查了 燃烧合成与 湿化学合成法 生产超细合金颗粒 以纳米级增强的形式， 原位复合材料 重点将 用于生产 Ti/TiB 2复合材料， 所采用的工艺适用于 广泛的金属间化合物。 的 燃烧合成方法学 涉及使Na与TiCl 4反应， BCl 3以产生Ti/TiB 2合金。 一 将建造流动反应器 它模拟了 会发生在生产规模上 系统，但也允许一个 详细调查 颗粒的形成、生长和 冷却过程。 测量 将由一个 探针采样和照明 散射技术 湿化学方法将是一种 低温液相 使用金属有机技术 前体和中间体。 反胶束和聚合物 稳定器将用于控制 合成、尺寸和 纳米晶体的稳定性。 微观结构的稳定性和 力学性能 固结材料 所产生的纳米颗粒 通过上述两个过程， 也将被研究。 在合成这些合金时， 材料类预计， 将表现出高强度、高 弹性模量，高韧性， 冲击性能，低灵敏度 温度变化或热 抗冲击、高表面耐久性和 对缺陷的敏感性低。

This project investigates the combustion synthesis and wet-chemical synthesis methods for producing ultrafine alloy particles in the form of nanosize reinforced in situ composites. Emphasis will be given to the production of Ti/TiB2 composites, although the processes employed are applicable to a wide range of intermetallics. The methodology for combustion synthesis involves reacting Na with TiCl4 and BCI3 to produce a Ti/TiB2 alloy. A flow reactor will be constructed which simulate the processes that would occur in a production-scale system, but also allow for a detailed investigation of the particle formation, growth and cooling processes. Measurements will be performed by a combination of probe sampling and light scattering techniques. The wet-chemical approach will be a low- temperature, solution-phase technique using metalorganic precursors and intermediates. Inverse micelles and polymeric stabilizers will be used to control the syntheses, sizes, and stabilities of the nanocrystals. The microstructural stability and mechanical properties of the materials obtained by consolidation of the nanosize particles produced by the two processes outlined above will be also studied. In synthesizing these alloys a new class of materials is expected that will exhibit high strength, high elastic modulus, high toughness and impact properties, low sensitivity to temperature chance or thermal shock, high surface durability and low sensitivity to flaws.