<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Hi all,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I have a 7cc vitreous carbon crucible liner with platinum melt that has cracked along the walls and base. I want to send this off for reclaim and put together a new platinum melt but would like advice on what crucible liner to use. The crucible will be used in two ebeam evap tools, but in one tool only the crucible base touches the hearth (i.e. not the sides). The platinum has bonded with the VC crucible and thus cannot be transferred to a new crucible (I presume I can’t just crack the crucible off from the platinum and put it in a new crucible?).<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>My crucible material options are graphite, Fabmate, vitreous carbon, and tungsten. <a href="http://www.neyco.fr/pdf/Materials_H_Liners.pdf">Neyco</a> recommend graphite or tungsten. <a href="http://www.vem-co.com/sites/default/files/pdfs/VEM_Thin_Film_Evaporation_Guide.pdf">VEM</a> recommend CG (graphite?) or ThO2. <a href="http://www.plasmaterials.com/ThinFilmEvapMatSrcRef.pdf">Plasmaterials</a> recommend graphite or ThO2. Kurt Lesker recommend graphite or Fabmate (not explicitly recommended).<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>It seems that no one recommends vitreous carbon so perhaps that was the wrong material to use for platinum. I suspect tungsten may alloy with platinum so this may be a poor recommendation by Neyco. As the reclaim value covers only ~50% of the cost of new material, I would like to avoid cracking this crucible for as many depositions as possible.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Suppliers I am considering are Kurt Lesker (graphite, Fabmate) and Sage (graphite, vitreous carbon).<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Any advice would be greatly appreciated.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks in advance,<o:p></o:p></p><p class=MsoNormal>Matt Dwyer<o:p></o:p></p><p class=MsoNormal><span style='color:#A6A6A6;mso-style-textfill-fill-color:#A6A6A6;mso-style-textfill-fill-alpha:100.0%'>Grad student, UW-Madison<o:p></o:p></span></p></div></body></html>