In recent years, selective catalytic reduction (SCR) has been widely used as the most efficient denitrification technology at present. The principle of this air pollution control technology is that in the presence of reducing agent NH₃, the flue gas containing NO_x reacts with the surface of the catalyst in a certain temperature range through the catalyst, making NO_x react with the surface of the catalyst. The NH₃ reaction is converted into harmless N₂ and H₂.

Ammonium metatungstate powder is widely used in chemical industry as raw material of petroleum cracking catalyst, corrosion inhibitor (anticorrosive coating or coating) for electronic components, and as important raw material for preparing composite powder, doped tungsten wire and tungsten-cerium electrode in the production of tungsten products.

Tungsten aluminum alloys have excellent properties of both aluminium and tungsten, such as low density, high specific strength, high temperature resistance, corrosion resistance and easy processing. In addition to the advantages of aluminium and tungsten, aluminium-tungsten alloy also has the greatest feature of wear resistance, which can be well applied to golf clubs and ball heads, medical equipment components (breathing machines), automotive engine piston, hub and other components, and hopefully in the future to be applied to armor materials and aerospace engines and other fields.

The front and rear casings of the aero-engine compressor are made of iron-based and nickel-based alloys respectively. During the process of use, the butt joints of the front and rear casings are in vibration and are prone to impact wear. The original wear-resistant coatings are due to hardness. The lower the toughness, the more damage occurs after a period of wear, and the life of the front and rear casings is shortened. Therefore, it is an urgent problem to prepare a coating with high wear resistance to solve the wear of aviation equipment and prolong the service life of aviation equipment.