Tungsten Oxide

Because violet tungsten oxide (VTO) producing process and process parameters are simple as well as equipment are easy to control and many advantages so many manufactures are like to use VTO to producing tungsten powder. VTO cycle reduction method can producing excellent performance submicron or micro tungsten powder particles, to further understand tungsten powder in the reactions process which is used cycle reduction method will conducive to the future development and maturity of this method. After studies, VTO is first hydrogen reduced to tungsten powder and the specific surface area of tungsten oxide is 0.141m 2  • g -1  and particle size mainly between 4.72-12.13um. Compared with the original VTO particle size distribution, after first reduction the particle of VTO is significantly thinner, but still existing coarse particles. The tungsten powder in the air oxidation to tungsten trioxide for the first the specific surface area of it is 0.145m 2  • g -1, ...

Fine and uniformity tungsten powder are key point for producing carbide, and micron and submicron tungsten carbide powder is useful to producing carbide. According to the relevant academic report found that single tungsten oxide can produce submicron or micron tungsten powder. Using violet tungsten oxide (VTO) producing fine tungsten oxide not only the process of it is simple as well as process parameters are easy to control and also equipment are not complex etc. Producing process as follows: 1. VTO were first reduction in hydrogen, along a first temperature of 640 ℃, the second temperature of 760 ℃, third temperature of 860 ℃, when the temperature reaches 860 ℃ heat preservation for 20min. 2. in the air at 500 ℃ making tungsten powder to oxidation with slowly heated for the first time, then heat preservation for 10min. 3. Replace the first step and second to continuous cycle reduction reaction. 4. Using alcohol on the analytical results above steps were dispersed pattern, t...