Characterization of the structure of TiB_2/TiC nanocomposite powders fabricated by high-energy ball milling

摘要

TiB_2/TiC nanocomposite powders were successfully prepared by high-energy ball milling of the powder mixtures of Ti and B_4C. X-ray diffraction analysis showed that the TiC phase was not produced until the milling time was up to 24 h and only a minimal amount of TiB_2 was generated, even after 48 h of milling. The critical grain size of Ti milled for the reaction between Ti and B_4C was 31.2 nm. Transmission electron microscopy clearly indicated that the resulting powder mixture obtained after milling for 48 h and annealing at 800 °C for 30 min was composed of nanosized TiC and TiB_2 particles.