Preparation of Boron Carbide Spherical Films and Hollow Microsphere

Boron carbide spherical-films were prepared by electron-beam evaporation deposition technique on steel ball substrates,combined with a independently designed magnetron rolling method. The boron carbide micro-shell was obtained after sintering, drilling and corrosion. The microcosmic appearance, microstructure, morphology, element composition of the boron carbide spherical films were investigated. The effect of annealing temperature (800–1100 on the boron carbide hollow micro-shells was also studied. The products were characterized by scanning electron microscope (SEM), X-ray photoelectron spectroscope (XPS), atomic force microscope (AFM). The results show that the film is dense without any cracks and pores. Besides, the elemental distribution is well-proportioned. When the annealing temperature is over 900 the coating is self-standing formed into a hollow microsphere. The hollow microsphere annealed at 900 as the best micro appearance with a thickness over10 μm.