Synthesis of VN/CrN Nanocomposite Powder by Carbothermal Reduction and Nitridation Method

After nanosized vanadiumpentoxide, chromium sesquioxide and carbon black particles were dried and mixed by high energy ball-milling, the resulting homogeneous mixtures were calcinated in nitrogen atmosphere and VN/CrN nanocomposite powders were obtained. The products were characterized by XRD, TG-DSC, SEM, BET and TEM. The effects of reaction temperature and keep warm time on the structure and performance of the VN/CrN nanocomposite powders were investigated. The results showed that VN/CrN nanocomposite powders with an average particle size of 40 nm were synthesized at 1 200 ℃ for 2 h. The as-prepared nanocomposite powders with a surface area of 21.09 m2/g were mainly composed of VN, CrN and VCrN2. These three constituents had all face-centered cubic structures with space group Fm3m. Subsequently, the nanocomposite powders as additive were added into the vitrified bonds. As a result,the mass fraction of nanocomposite powders was 0. 2% ,the bending strength and flow property of the prepared vitrified bond could increase by 20% and 50% , respectively. However,when the vitrified bond contained 1.0% of nanocomposite powders by mass ,the bending strength and flow property reached the maximum, and the values were 115.6 MPa and 207.2%, respectively.