Mask machine is a machine used for automatic production of multi-layer flat masks such as N95 masks and surgical masks. Tungsten carbide drill that plays the role of drilling on the mask machine is made of fine-grained cemented carbide, which has high strength, good toughness, high temperature resistance, good corrosion resistance, high hardness, good wear resistance, smooth chip removal, and small calorific value for drilling.

WO3 hollow-sphere, as a typical n-type semiconductor, has good sensitivity to alcohol, acetone, CS2, and other organic gases, so it is regarded as the most important sensing material for fabricating highly sensitive gas sensor. Some experts have prepared WO3 hollow spheres in solution phase by the controlled hydrolysis of WCl6 using novel carbon microspheres as the templates.

WO3 nanopowder is an n-type semiconductor with wide extending applications. For example, nano WO3 is widely applied to produce functional ceramic. And the prepared functional ceramics show good nonlinear electrical properties characterized by low voltage and small current. Some experts have used nano WO3 and CeO2 powders to prepare CeO2 doped WO3 ceramics to study the effect of initial powder nanometerization on ceramic properties.

WO3, or tungsten trioxide, is a functional material with a wide range of applications. Tungsten trioxide has been systematically studied in areas such as electrochromism, detection of toxic gas, and photochemical catalysis.