Continuous Nanoscale Carbon Fibers with Superior Mechanical Strength
Carbon fibers possess high strengths (3-7 Gpa), high moduli (200-500 Gpa), and low densities (1.75-2.00 g/cm3). The high strength-to-weight ratio combined with superior stiffness has made carbon fibers the material of choice for high performance composite structures in aerospace, defense, and other industries. 1Shortly after how to produce carbon fibers was discovered, the tensile strength of the T300? Carbon fibers made by the Toray Industries, Inc. Reached ~3 Gpa. The theoretical tensile strength of carbon fibers, however, is over 180 Gpa. After many years of research, the strongest carbon fibers that can be produced today (T1000?) have a tensile strength of merely ~7 Gpa. Research efforts have repeatedly demonstrated that the degree of structural perfection is the most crucial factor on mechanical strength of carbon fibers. The amount, size, and distribution of structural imperfections directly determine the mechanical strength of carbon fibers.1 The structural imperfections in carbon fibers, as schematically shown in Figure 1, include (1) surface defects such as nicks, cracks, punctures, as well as diametrical bulges, (2) bulk defects such as large cavities, small holes, endogenous pores and/or flaws, cracks and/or flaws induced by internal stress, Mrozowski cracks, refractory inclusions, and other entanglements, voids, and/or disordered structures, and (3) structural inhomogeneity such as sheath-core structures.
Hao Fong
Department of Chemistry, South Dakota School of Mines and Technology, 501 East St.Joseph Street,Rapid City,SD 57701, USA
国际会议
上海
英文
957-958
2009-05-27（万方平台首次上网日期，不代表论文的发表时间）