Preparation and properties of TaC/C/TaC similar to TaC composite micro-tubes by vapor phase tantalizing of the regular carbon micro-coils/micro-tubes

TaC/C/TaC similar to TaC composite micro-tubes were prepared by the vapor p hase tantalizing of the regular carbon micro-coils/micro-tubes, and the pre paration conditions and some properties were examined. The carbon micro-coi ls with a tube-like morphology were tantalized from the surface to the core of the carbon fibers with full preservation of the tube-like morphology to form TaC/C/TaC similar to TaC composite micro-tubes. The bulk electrical r esistivity and specific surface area of the TaC/C/TaC similar to TaC compos ite micro-tubes were 4 x 10(-3) to 5 x 10(-4) Omega .m and 5 x 10(3) to 2 x 10(4) m(2)/kg, respectively, depending on the tantalized ratio and the bul k density. (C) 2001 Kluwer Academic Publishers.