Tungsten carbide hollow drill, which is called annular cutter when it is used in metal, is a drill specifically designed to remove a cylinder of material, much like a hole saw. Tungsten carbide hollow drill bits are used for many applications, either where the core needs to be preserved, or where drilling can be done more rapidly since much less material needs to be removed than with a standard bit.

Tungsten carbide core drill can be a cost effective means of drilling through softer unconsolidated formations. And such a core drill is applicable to hole cutting and process of annular groove on various magnetic drills and press. Tungsten carbide does not possess the hardness of diamond, while it is relatively cheap compared with diamond drill. It cuts effectively at low r.p.m. (revolution per minute) and low weight on bit.

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 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 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, 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.

Nanoblock WO3 is related to the concept of electrochromism. More precisely, Nanoblock WO3 has an electrochromic effect, which can change color under the action of an external electric field. According to the experts, the reason why nano WO3 has an electrochromic effect is due to the surface effect of the nanomaterials, which makes the oxygen ions on the surface of WO3 grains have high activity and can migrate in the sample, and tungsten ions can be combined or separated with electrons under the action of an external electric field, so that the sample changes color with external voltage.

As a photocatalytic material, WO3 has high photocatalytic activity and stability, so it has good industrial application prospects in the field of photocatalysis. You know, ethylene is harmful for storage and fresh-keeping of fruits and vegetables. Photocatalytic technology is an effective and environmentally friendly approach for degrading ethylene. Some experts have synthesized a WO3 photocatalyst using synergetic internal Fe3+ doping and superficial Pt loading for ethylene degradation under visible-light irradiation.

WO3 is a visible-light responsive photocatalyst that absorbs light up to 480 nm with several advantages such as low cost, harmlessness, and stability in acidic and oxidative conditions. WO3-based photocatalysts have various applications such as photodegradation of organics, air purification, self-cleaning, CO2 photoreduction, heavy metal ion treatment, hydrogen evolution from splitting water, and bacterial disinfection.

As a photocatalytic material, nano WO3 is welcomed as it has divergent admirable features like high stability, non-toxicity, ease of preparation, suitable band edge positions and facile generation of active oxygen species in the aqueous medium. Nano WO3 finds unparalleled opportunity in wastewater purification under UV/visible light. While the perennial failings of the photocatalytic material emanate from the stumbling blocks like rapid charge carrier recombination and meager visible light response.