LEAPS-MPS: Exploring Centrifugal Jet Spinning of Ultra-High-Temperature Ceramic Nanofibers

LEAPS-MPS：探索超高温陶瓷纳米纤维的离心喷射纺丝

• 批准号: 2137923
• 负责人: Rogelio Benitez
• 金额: $ 24.99万
• 依托单位: The University of Texas Rio Grande Valley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2137923&HistoricalAwards=false
• 关键词: LEAPS; MPS; Exploring; Centrifugal; Jet

This award is funded in whole or in part under the American Rescue Plan Act of 2021 (Public Law 117-2).NON-TECHNICAL DESCRIPTION: This research project consists of a novel method to fabricate micro- and nano-sized ceramic fibers that can withstand several thousand degrees Celsius without melting. A metal salt and a polymer are dissolved to make a viscous solution that is subsequently spun into fibers. The fibers are then heat treated to react the metal with the carbon in the polymer and form the ultra-high-temperature ceramic fiber. The effects of high temperatures and oxygen in the atmosphere on the fibers’ microstructure are also studied. This research makes it possible to fabricate, in large quantities and at low temperature, ceramic nanofiber mats of compounds not available in fiber form. These ultra-high temperature ceramic fiber mats can contribute to thermal protection systems that allow aircraft, missiles, and rockets to travel faster and for a longer period at hypersonic speed. Two undergraduate students and two graduate students from a minority-serving institution are obtaining laboratory experience in ceramic manufacturing and testing. Another 8 to 16 undergraduate students are engaged in designing, fabricating, and testing equipment for ceramic materials characterization. Graduates typically find employment in the high-tech industry or further pursue graduate degrees.TECHNICAL DETAILS: Several synthesis methods exist for the fabrication of transition metal carbide nanocrystalline nanoparticles, nanorods, nano-powders, and nanowires; however, it is still a great challenge to fabricate long and continuous ultra-high-temperature transition metal carbide nanofibers using scalable techniques for mass production. In this project, novel transition-metal carbide nanofibers are fabricated by the carbothermal reduction of polymer precursor nanofibers manufactured by centrifugal jet spinning. Centrifugal jet spinning uses centrifugal forces to produce fibers from solutions at speeds and costs similar to melt-blown and glass fiber methods and is used in this project to leverage the energy-efficient polymer precursor synthesis method with the added benefit of being easily scalable for mass production. The oxidation behavior of the fibers is also investigated. The knowledge obtained from this project can be useful to fabricate other ceramic fibers in large quantities. In addition, this research provides opportunities for undergraduate and graduate students of underrepresented groups to obtain hands-on experience in materials science and engineering.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该奖项的全部或部分资金根据《2021 年美国救援计划法案》（公法 117-2）提供。 非技术说明：该研究项目包括一种制造微米和纳米尺寸陶瓷纤维的新方法，该方法可以金属盐和聚合物溶解后形成粘稠溶液，随后将其纺成纤维，然后对纤维进行热处理，使金属发生反应。还研究了大气中的高温和氧气对纤维微观结构的影响，使大批量、低成本的制造成为可能。这些超高温陶瓷纤维垫可用于热防护系统，使飞机、导弹和火箭能够以高超音速更快、更长时间地飞行。和两名研究生少数族裔服务机构正在获得陶瓷制造和测试方面的实验室经验，另外 8 至 16 名本科生从事陶瓷材料表征设备的设计、制造和测试。毕业生通常会在高科技行业找到工作或进一步攻读研究生。技术细节：目前存在多种制备过渡金属碳化物纳米晶纳米颗粒、纳米棒、纳米粉末和纳米线的合成方法，但制备长纳米碳化物仍然是一个巨大的挑战。使用可大规模生产的连续超高温过渡金属碳化物纳米纤维在该项目中，新型过渡金属碳化物纳米纤维是通过离心喷射纺丝制造的聚合物前体纳米纤维的碳热还原来制造的。以与熔喷和玻璃纤维方法相似的速度和成本从溶液中生产纤维，并在该项目中使用，以利用节能聚合物前体合成方法，并具有额外的优势还研究了纤维的氧化行为，可用于大量制造其他陶瓷纤维。此外，该研究为代表性不足的本科生和研究生提供了机会。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。