Tungsten Oxide

After the study, we found that violet tungsten oxide particle affecting factors includes raw material (APT) particle size and production process conditions. Production process conditions include reducing temperature, heating rate, water vapor and hydrogen pressure ratio, material thickness and reaction time. Firstly, the influence factor is water vapor and hydrogen partial pressure ratio, which are water vapor and hydrogen partial pressure ratio increases and the size of products larger. This is mainly due to the formation of hydrogen gas to form a volatile humidity hydrous tungsten oxide, tungsten oxide which is easy to cover the finer particles, so that the particle size increases.  Secondly, the impact factor is heating rate, after experiment found that to produce fine particles the heating speed should not too fast. When the reduction in a tube furnace, the heating rate depends on the furnace temperature gradient and push the boat speed, hence reducing the furnace tempera...

With the development of research, the ultra-fine particles as a new material have been widely used in modern industry and science. Violet tungsten oxide (VTO) has special properties and structure so get a lot of favor in producing ultrafine tungsten powder. During producing tungsten powder not only process conditions is important but the raw marital particle size is also an important factor. Therefore, to study violet tungsten oxide particle affecting factors is very important. Producing violet tungsten oxide is through boatload an amount of ammonium paratungstate and pushes it into the reduction furnace hot zone. At the same time add a certain proportion of hydrogen and steam mixture to heat at a certain temperature, after a period heat preserving then cooling to obtain. During the reaction, the factors that influence the violet tungsten oxide grain size are the raw material (APT) particle size and production process conditions. Production process conditions include redu...