Vapor Grown Carbon Fibers-Reinforced Beryllium Composite

9361230丁铍是需要低密度、低强度和/或热性能的应用的候选材料，例如空间结构、热屏蔽、散热器和核聚变反应堆第一壁部件。然而，铍的使用受到其中等导热系数和脆性的限制，这两者都导致了较低的热震断裂韧性。这也对铍组件的厚度施加了限制，这可能会对诸如面向Be等离子的瓷砖等应用施加寿命限制。有人建议开发一种石墨纤维增强铍复合材料，它既体现了铍和碳/碳复合材料的优点，又改善了两者的缺点。初步实验表明，使用高石墨化纤维可以消除或减少界面反应。建议使用的石墨纤维是气相生长碳纤维(VGCF)，这是已知的最可用的石墨纤维。在所提出的制备方法中制备复合材料。将致力于研究VGCF和Be之间的界面形成，并展示具有更好的热和机械性能的VGCF/Be复合材料。***

9361230 Ting Beryllium is a candidate material for applications requiring low density, strength, and/or thermal performance, such as space structures, heat shields, radiators, and nuclear fusion reactor first wall components. However, the use of beryllium is limited by its moderate thermal conductivity and brittleness, both of which result in a low thermal shock fracture toughness. This also places a limitation on the thickness of a beryllium component, which can impose limits in lifetime for application such as Be plasma facing tiles. It is proposed to develop a graphite-fiber-reinforced beryllium composite which will manifest the advantages of both beryllium and carbon/carbon composites, and which will ameliorate the disadvantages of either one. A preliminary experiment has suggested the advantages of using highly graphitic fiber to eliminate or reduce interface reaction. The graphite fiber proposed for use is vapor grown carbon fiber (VGCF), which is the most graphitic fiber know to be available. In the proposed fabricate the composites. Effort will be directed toward examining interphase formation, if any, between VGCF and Be, and demonstrating a VGCF/Be composite with improved thermal and mechanical properties. ***