Preparation and properties of microcoils and microtubes of NbC/C/NbC∼NbC by vapor phase metallizing of the regular carbon microcoils

NbC/C/NbC∼NbC composite microcoils and microtubes were prepared by vapor phase metallizing of regular carbon microcoils, and the preparation conditions and some properties were examined. The carbon coils were niobilized from the surface to the core with preservation of the coiling morphology to form NbC/C/NbC∼NbC composite microcoils or microtubes. The bulk electrical resistivity and specific surface area were 0.3 to 0.02 Ω·cm and 2 to 18 m2/g, respectively, depending on the niobilized ratio and the bulk density.