Improved strength of carbon nanotube yarn by high temperature jule anealing process with tension

Abstract

CNT spun yarn is expected to be used for high-strength wire rods, but at present, it does not reach the mechanical strength of carbon fiber, which has already been put into practical use. Recently, it has been proposed that an electric heating method with tension is effective as a method of increasing the strength of CNT spun yarn. In this study, in order to make this method more practical, we introduced a new process to increase the density by passing the CNT spun yarn over ethanol absorbent cotton before heating. By introducing this process, we succeeded in stabilizing the high-temperature heat treatment (3000 K) and succeeded in significantly increasing the strength to a maximum tensile rupture stress of 2.61 GPa (untreated: 1.31 GPa).