구리튜브를 피복재로 이용한 분말시스압연법에 의해 제조된CNT/Al 복합재료의 미세조직 및 기계적 특성

Abstract

A powder-in-sheath rolling (PSR) process utilizing a copper alloy tube was applied to a fabrication of amulti-walled carbon nanotube (CNT) reinforced aluminum matrix composite. A copper tube with an outer diameter of30 mm and a wall thickness of 2 mm was used as a sheath material. A mixture of pure aluminum powders and CNTswith the volume contents of 1, 3, 5 vol% was filled in the tube by tap filling and then processed to 93.3% heightreduction by a rolling mill. The relative density of the CNT/Al composite fabricated by the PSR decreased slightly withincreasing of CNTs content, but showed high value more than 98%. The average hardness of the 5%CNT/Al compositeincreased more than 3 times, compared to that of unreinforced pure Al powder compaction. The hardness of the CNT/Al composites was some higher than that of the composites fabricated by PSR using SUS304 tube. Therefore, it is concludedthat the type of tube affects largely on the mechanical properties of the CNT/Al composites in the PSR process.