Hexagonal WO3 (h-WO3) has caught a great attention due to its unique tunnel structure. In h-WO3, six-membered rings composed of WO6 octahedra are arranged along the (001) plane by sharing corner oxygens, with formation of open tunnels that have a theoretical intracrystalline tunnel size of 0.39 nm, along the c-axis throughout the entire unit cell.

Milling processing is divided into down milling and up milling. Down milling is a milling method in which the rotation direction of the contact part of the milling cutter and the workpiece is the same as the cutting feed direction. Up milling is a milling method in which the rotating direction of the contact part of the milling cutter and the workpiece is opposite to the cutting feed direction.

Molybdenum disulfide(MoS2) is a kind of solid powder which is made from natural molybdenum concentrate powder by chemical purification and changing its molecular structure. It is black with slight silver gray, metallic luster, slippery to the touch, and insoluble in water.

Molybdenum disulfide (MoS2) is a type of transition metal sulfide with glossy lead gray solid powder. It is synthesized and appears black, which has stable chemical property.

The ratio of coated cemented carbide tools in metal processing industry is increasing steadily. In recent 10 years, its quality and performance have been significantly improved. On the one hand, due to the quality improvement of the coating , it will be better to control porosity and thickness; on the other hand, the metallurgical technology between the coating and the substrate interface has also been improved, therefore can increase the adhesion of the coating and prevent the interfacial reaction that reduces the strength. Increasing cutting speed can significantly improve productivity, and the use of coated tools is the most effective way to reduce costs.

Integrated circuit board (PCB) is the key component of electronic information industry chain, as a key tool of PCB micro hole processing and printing, ultra-fine integrated circuit board micro drillcan only be made by ultra-fine grained cemented carbide.

Using the principle of discrete-stacking, 3D printing technology is the manufacturing method to produce molded solid parts by layer-by-layer accumulation way based on three-dimensional model. For the rapid proto typing advantage of complex part, it provides the solution for the preparation of cemented carbide parts to a certain extent. After recent years of development, printing technology has played an increasingly important role in the preparation of precision parts.

Nitrogen Oxides are a family of poisonous, highly reactive gases. These gases form when fuel is burned at high temperatures. It is major source is from vehicles, trucks, industry facilities and so on.

Hydrogen energy is a renewable clean energy that has been believed to be promising substitute to current energy source of fossil fuels. Electrochemical water splitting is a feasible approach to produce hydrogen gas in which hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) taking place at cathode and anode electrodes respectively.

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