Many people will travel to Switzerland to buy expensive accessories, such as "unknown, expensive" Swiss watches (Rolex) and so on. You may know that Swiss law has very strict rules on what is “Swiss Made” and “Swiss Made” watches – the movement uses the “Swiss Movement” logo, the quartz label is “Swiss Quartz”, and the watch box is also marked. On the "Swiss Case", even the strap must have "Swiss Strap". It can be said that a real Swiss watch, there is a "Swiss" logo on the body, I am afraid that we do not know that it is Swiss-made. However, I don’t know if you know that the material of these ornaments, tungsten steel, is not produced in Switzerland, but it is actually produced in China. However, it cannot say "speaking hard", "In fact, I am also from China!".

Unbonded tungsten carbide cemented carbide has better high temperature resistance, wear resistance, corrosion resistance, oxidation resistance and higher hardness than traditional cemented carbide. It is becoming an important development direction of high wear resistant cemented carbide.

Barium strontium tungstate cathode as tungstate cathode first appeared in the form of compacted cathode in the 1960s. The cathode is made of barium strontium tungstate (Ba₅Sr (WO₆)₂) as an active material for emission. The synthesized barium strontium tungstate and activator, as well as tungsten powder with a certain size, are pressed and sintered in hydrogen at high temperature.

Additional material manufacturing is a new processing technology, which is different from the traditional "removal" manufacturing. It does not need the original embryo and die. According to the computer three-dimensional model data of parts directly, it can form any complex shape object by adding material layer by layer. Nowadays, people have given the added material manufacturing a fashionable name - 3D printing.