Tungsten Copper Electrode—Explosive Powder Compaction (1/2)

Generally, tungsten copper consist of tungsten (W) and copper (Cu) is called psudoalloy, which has a big difference of melting point and immiscible. It uses powder metallurgy (PM) to fabricate porous tungsten skeleton and dipped, infiltrated in copper liquid or liquid-phase sintering after mixed powder compacting to achieve tungsten copper composite material. However, for tungsten copper W-Cu system, Tungsten and copper two-phase mutual infiltration is poor, tungsten copper in the liquid is almost insoluble occur, which makes it difficult to achieve the desired uniform organizational structure, and a high degree of densification.

Explosive powder compaction belong to an explosive molding, which is the use of high impact energy generated by the blast, the upcoming explosive chemical energy into mechanical energy, adiabatic compression of the powder, and instantly generate high temperature and pressure to achieve the densification of the powder material. In addition, the explosion process also includes explosive welding, explosive hardening, high-speed forging die and so on. Commonly used explosives are ammonium nitrate explosives, detonating cord, rubber explosives and TNT, etc.

Compared with common processing methods (stamping, hydraulic pressure), explosive powder compaction has many advantages, such as explosion is a very fast process, short duration of action (microsecond), high pressure, high speed of deformation, has fast melting and cooling property, which is beneficial for keeping the excellent properties of the powder. Therefore, it can be widely used in the powder compaction researches of composites with metal matrix, intermetallic compound, nano blocks and quasicrystals, ceramics and other metastable amorphous alloy.

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