Due to their unique properties, tungsten borides are good candidates for the industrial applications where certain features such as high hardness, chemical inertness, resistance to high temperatures, thermal shock and corrosion. In this study, conditions were investigated for producing tungsten boride powder from tungsten oxide(WO3) by self-propagating high-temperature synthesis (SHS) followed by HCl leaching techniques. In the first stage of the study, the exothermicity of the WO3-Mg reaction was investigated by computer simulation. Based on the simulation experimental study was conducted and the SHS products consisting of borides and other compounds were obtained starting with different initial molar ratios of WO3, Mg and B2O3. It was found that WO3, Mg and B2O3 reaction system produced high combustion temperature and radical reaction so that diffusion between W and B was not properly occurred. Addition of NaCl and replacement of B2O3 with B successfully solved the diffusion problem. From the optimum condition tungsten boride(W2B and WB) powders which has 0.1~0.9 um particle size were synthesized.

• 최상훈(Department of Nano Advanced Material Engineering, Chungnam National University, Daejeon 305-764, Korea) | Choi, Sang-Hoon
• 원창환(Rapidly Solidified Materials Research Center(RASOM), Daejeon 305-764, Korea) | Won, Changwhan
• Hayk Nersisyan(Rapidly Solidified Materials Research Center(RASOM), Daejeon 305-764, Korea)