Blue tungsten oxide producing method mainly is ammonium paratungstate (APT) closed calcination, APT hydrogen mild reduction and internal reduction method.

Spark Plasma Sintering (SPS) is a kind of new sintering technology based on electrical discharge machining. It belongs to plasma sintering technology, which uses sparks and gap discharge to sinter in pressure. While the other is in a vacuum environment, uses 5000-20000k plasma flame to heat sintering, this called thermal plasma sintering.

Binderless tungsten carbide refers to a class of high wear-resistant WC tungsten carbide containing less than 0.5% by mass of Co., which has higher hardness, wear resistance and resistance than traditional WC-Co tungsten carbide. Corrosive and superior polishing characteristics, while reducing the cost of raw materials, and reducing the impact of Co6tl radioactivity on the human body and the environment.

There are four main types of tungsten oxide, yellow, blue, violet and brown tungsten oxide.