At the moment, majority if not all pellets on the market are manufactured  with arc
melting method. With this method metal powder is melted under Ar. What happens is
that great volumes of gases get absorbed and adsorbed onto the surface of
powder during the storage period. Arc process goes under Ar, so there is
pressure. As a result gases do not evaporate and stay trapped inside the
material. when the pellet is melted there are voids and pores filled with
gas inside.

Electron beam technology for manufacturing of perfect evaporation pellets.

During the electron beam evaporation process  which goes in vacuum outer layers of the
pellet release these gases instantly. Then, a layer of molten metal
appears on the top of solid material which has yet to be melted. As the heat is
transferred to inner layers of the sample by thermal conductivity, gases
inside the solid part of the sample begin to heat. Naturally, when the
temperature reaches 2000 Celsius, the pressure inside of this very small
volume is extreme, but gases cannot escape since the material is solid.
Once the material heats up even more and becomes liquid, gases escape with
tremendous speeds through the layer of liquid metal, creating a jet force
dragging minuscule pieces of metal along. Click on the picture to see a larger version demonstrating this effect in detail.


For manufacturing of our pellets we use electron beam equipment. The process goes in vacuum which allows us to produce pellets which have little or no gaseous impurities or gases trapped inside the pellet. With our Ebeam pellets evaporation process always goes very smooth: no spitting, sparkling , outgasing or any other complications because of one simple reason- it all already happened during the manufacturing process.

Single crystal evaporation pellets.

For some materials we offer monocrystalline evaporation pellets for even better and smoother evaporation process. On this picture you can see 6 monocrystalline tungsten pellets. Other materials are available.