Production and qualification of an electrospun ceramic nanofiber material as a candidate future high power target
Production and qualification of an electrospun ceramic nanofiber material as a candidate future high power target
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静电纺陶瓷纳米纤维材料作为未来高功率靶材候选材料的生产和鉴定
DOI：
10.1103/physrevaccelbeams.24.123001
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Zwaska, Robert
中科院分区：
文献类型：
--
作者：
Bidhar, Sujit;Goss, Valerie;Chen, Wei-Ying;Stanishevsky, Andrei;Li, Meimei;Kuksenko, Slava;Calviani, Marco;Zwaska, Robert
为了开发和设计用于粒子物理研究的下一代高功率靶材料，探讨了利用静电纺丝工艺制备金属或陶瓷纳米纤维的可能性。建立了一个低成本的静电纺丝装置，用于内部生产各种陶瓷纳米纤维。以碳酸锆与高分子量聚乙烯吡咯烷酮聚合物溶液为原料，采用静电纺丝法制备了氧化钇稳定的氧化锆纳米纤维。通过改进静电纺丝系统的某些部分及其排列方式，克服了静电纺丝工艺固有的纳米纤维垫厚度大、生产速度慢等缺点，以更快的速度获得毫米级厚度的纳米纤维垫。制造出直径约100纳米的连续长纳米纤维，然后对其进行热处理以去除聚合物并使氧化锆结晶。制备的样品要满足一定的最小物理性能，如厚度、结构完整性、热稳定性和柔韧性。采用原子力显微镜技术对单根纳米纤维的力学性能进行了评价，发现单根纳米纤维的力学性能与大块氧化锆相当。利用电子束测试了纳米纤维的耐高温性能。在1mevion照射下，表现出抗辐射损伤的能力。部分氧化锆纳米纤维在高强度脉冲质子束作用下也保持了结构的完整性。本研究首次对陶瓷纳米纤维在不同光束和辐照条件下的物理性能进行了测试，验证了其作为加速器靶材的实际应用价值。讨论了纳米纤维作为潜在靶材的优势和挑战。
In an effort to develop and design next generation high power target materials for particle physics research, the possibility of fabricating nonwoven metallic or ceramic nanofibers by electrospinning process is explored. A low-cost electrospinning unit is set up for in-house production of various ceramic nanofibers. Yttria-stabilized zirconia nanofibers are successfully fabricated by electrospinning a mixture of zirconium carbonate with high-molecular weight polyvinylpyrrolidone polymer solution. Some of the inherent weaknesses of electrospinning process like thickness of nanofiber mat and slow production rate are overcome by modifying certain parts of electrospinning system and their arrangements to get thicker nanofiber mats of millimeter order at a faster rate. Continuous long nanofibers of about hundred nanometers in diameter are produced and subsequently heat treated to get rid of polymer and allow crystallize zirconia. Specimens were prepared to meet certain minimum physical properties such as thickness, structural integrity, thermal stability, and flexibility. An easy innovative technique based on atomic force microscopy was employed for evaluating mechanical properties of single nanofiber, which were found to be comparable to bulk zirconia. Nanofibers were tested for their high-temperature resistance using an electron beam. It showed resistance to radiation damage when irradiated with 1 MeVion. Some zirconia nanofibers were also tested under high-intensity pulsed proton beam and maintained their structural integrity. This study shows for the first time that a ceramic nanofiber has been tested under different beams and irradiation condition to qualify their physical properties for practical use as accelerator targets. Advantages and challenges of such nanofibers as potential future targets over bulk material targets are discussed.
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