SBIR Phase II: Process Control of Physical Property Variation in Vapor-Grown Carbon Fibers

SBIR 第二阶段：气相生长碳纤维物理性能变化的过程控制

• 批准号: 9623818
• 负责人: Ronald Jacobsen
• 金额: $ 28.79万
• 依托单位: APPLIED SCIENCES, INC.
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-09-01 至 1999-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9623818&HistoricalAwards=false
• 关键词: SBIR; Phase; II; Process; Control

9623818 Jacobsen This Small Business Innovation Research Phase II project will refine the CVD processing window for beaded fiber, and develop the window for crenulation free fiber. The resulting products will be used to fabricate various composites, which will then be tested relative to their normal crenulated fiber counterparts. Crenulation-free fiber is expected to impart improved and more reliable thermal and electrical transport properties to its composites. The beaded morphology is expected to give composites improved mechanical reinforcement, with reduced crack propagation, and greater flexibility in matrix choice due to its ability to physically interlock, rather than chemically bond, with a matrix. This research effort seeks to define manufacturing process variables for the control of vapor-grown carbon fiber (VGCF) morphology. Previous efforts demonstrated that the properties of individual fibers depend on the degree to which they exhibit a morphological feature called crenulation. Further, it has been shown that the severity of crenulation can be increased by certain modifications in the manufacturing process. In the extreme, mild crenulations give way to a novel morphology with well-defined beads, scattered along the fiber's length. The VGCF morphologies under development would mechanically reinforce composites, and provide improved thermal and electrical properties. Such composites would be employed in the automotive and aerospace industries, where their low densities give them a very high weight adjusted figure of merit. They would also be used in the electronics industry. The fiber is also being studied specifically for use in low-friction bearings, and as a reinforcement to tire rubber.

9623818雅各布森这个小企业创新研究第二阶段项目将完善串珠纤维的化学气相沉积加工窗口，并开发无扭曲纤维的窗口。生成的产品将用于制造各种复合材料，然后将相对于其正常的皱折纤维对其进行测试。无弯曲纤维有望为其复合材料提供更好和更可靠的热和电传输性能。这种珠状形态有望为复合材料提供更好的机械增强，减少裂纹扩展，并由于其与基质物理互锁而不是化学结合的能力，在基质选择方面具有更大的灵活性。这项研究旨在确定用于控制气相生长碳纤维(VGCF)形态的制造工艺变量。以前的研究表明，单个纤维的性质取决于它们表现出一种被称为皱缩的形态特征的程度。此外，已经证明，通过在制造过程中进行某些修改，可以增加破裂的严重程度。在极端情况下，温和的皱折让位于新的形态，沿着纤维的长度散布着定义良好的珠子。正在开发的VGCF形态将机械地增强复合材料，并提供更好的热和电性能。这种复合材料将被用于汽车和航空航天行业，在这些行业，其低密度使其具有非常高的重量调整优值系数。它们还将用于电子行业。这种纤维还被专门用于低摩擦轴承，以及作为轮胎橡胶的增强剂。