WO3 thin film is regarded as the best sensing material for the fabrication of sensitive and selective NO2 gas sensor. Some experts have fabricated NO2 gas sensor using WO3 thin films grown directly on to a soda-lime glass substrate without assistance of any seed layer by a simple and a facile hydrothermal technique.

Solid tungsten carbide drill has the characteristics of high efficiency, high accuracy, high degree of finish, high hardness, high strength, high wear resistance, bending resistance, breakage resistance, and long service life. And such a drill is easy to use, safe, reliable, economical and labor-saving. So, the tungsten carbide drill can reduce the processing cost of each hole while ensuring the drilling quality and drilling rate of the hole.

WO3 has excellent sensitivity and fast response speed to NH3 - colorless gas with strong pungent odor, so it is often made into a semiconducting gas sensor for NH3 detection. And therefore, WO3-based NH3 gas sensor has become one of the key research projects of scholars at home and abroad.

Tungsten carbide acicular drill, which is specially designed for a new drilling method - small-diameter drilling method, is suitable for use in medium-hard rock formations of 6-8 grades. Such an acicular drill bit has higher drilling efficiency, better quality, lower cost and less material consumption than ordinary alloy drill bits and steel drill bits.