Chromium can be e-beam evaporated from a FABMATE®, graphite, or tungsten crucible liner. A key process note is to consider the fill volume of the crucible liner. We find that the melt level of a material in the crucible directly affects the success of the crucible liner. Overfilling the crucible will cause the material to spill over and create an electrical short between the liner and the hearth. The outcome is cracking in the crucible liner. This is the most common cause of crucible liner failure. Placing too little material in the liner or evaporating too much material before refilling can be detrimental to the process as well. When the melt level is below 30%, the e-beam is likely to strike the bottom or walls of the crucible which immediately results in breakage. Our recommendation is to fill the crucible between ⅔ and ¾ full to prevent these difficulties.
Crucible liners should be stored in a cool, dry place and always handled with gloves or forceps.
Category: Evaporation Sources
Sub-Category: Crucible Liners for E-Beam Sources