Abstract:High-quality nano-tungsten powder is the prerequisite for the preparation of high-performance nanocrystalline tungsten alloys and cemented carbides. The tungsten powder prepared by hydrogen reduction produces WO2(OH)2, which leads to the growth of tungsten powder grains. The carbothermal reduction method can effectively avoid this problem. This study focused on the influence of carbothermal reduction temperature, atmosphere, time and dynamic/static process on the phase structure and particle size of the product. The results show that the purity of the product in vacuum atmosphere is higher than that in argon atmosphere. With the increase of reduction temperature, the product changes from high-valence tungsten oxide to low-valence tungsten oxide and finally to pure tungsten. When the holding time is 1 h, the average particle size of tungsten powder increases from 67 nm to 118 nm with the increase in reduction temperature from 1000 ℃ to 1100 ℃. When the reduction temperature is 1000 ℃, the average particle size of tungsten powder increases from 67 nm to 93 nm with the prolongation of holding time from 1 h to 3 h. Nano-tungsten powder with an average particle size of 67 nm can be prepared under the vacuum dynamic carbothermal reduction at 1000 ℃ for 1 h.