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Recent content by marcus4

  1. marcus4

    Magnifer 7904 heat treatment

    All clear. Thanks guys
  2. marcus4

    Magnifer 7904 heat treatment

    495c, thanks, clear. But looking at the cooling rate of 0.9k/min (4c/secomd, right?) it can be really tricky. Or I miss something here again?
  3. marcus4

    Magnifer 7904 heat treatment

    So, if the part will operate at the service temperature 20-30c I should proceed with the take out @ 490-500c for the best magnetics properties?
  4. marcus4

    Magnifer 7904 heat treatment

    Please correct me if I'm wrong."Service temperature" is nothing else but operating temperature?
  5. marcus4

    Magnifer 7904 heat treatment

    Hello. Please help me understand the detail about the "Take-out-temperature " of the soft magnetics 7904 material. I don't fully understand the therm "Service temperature" at figure 7&8 site 7 of the data sheet...
  6. marcus4

    Small sized vacuum furnace advice

    Hi guys, thanks a lot for tips and technical details I have to ask from the manufacturers. I hope I can find something close as described. Cheers!
  7. marcus4

    Small sized vacuum furnace advice

    Hello, I decided to buy furnace for small in house batches. I need it for Permalloy small thin parts (transformer laminations). By search I found several manufacturers, mainly from China and they offer relaivelly cheap options (from 3-5k$) but I'm not sure about parameters I have to define. Ok...
  8. marcus4

    Ni78 soft magnetics alloy annealing

    thanks @EdStainless. Yes, uncoated :( As I mentioned above, I'm not sure how fast should be the cooling from annealing temp to 593°C? Can I just switch off the heating and wait temp. to drop or I need some inert gas to speed the process? If I need to speed it up, what rate?
  9. marcus4

    Ni78 soft magnetics alloy annealing

    Hi guys, thanks for the tips. Since Im not sure about the amount of vacuum inside this little furnaces I presume that I have to find one locally and do the experiment. Unfortunatelly, parts I want to anneal are thin (0,2mm laminate) and I presume that I have to use Mgo powder to separate them...
  10. marcus4

    Ni78 soft magnetics alloy annealing

    Hi dgallup. I cant find technical details about this furnace, but I give this one as the example. There is a lot of other small (and affordable) dental furnaces on the market and i can choose the right one, but not sure which one? Also, if you know exact model please recommend. My application...
  11. marcus4

    Ni78 soft magnetics alloy annealing

    Hi MagBen, yes, Fe ni 78 or 80liek this 0.02 C, 0.50 Mn, 0.35 Si, 80.00 Ni, 4.20 Mo, Bal. Fe. As far i know dry H2 is recommended for the maximum permeability and to clean impurities, but I will be happy with the average results. This is from the manufacturer datasheet: "For maximum softness...
  12. marcus4

    Ni78 soft magnetics alloy annealing

    Hello. I need small quantity parts to be annealed and wonder can I use dental vacuum furnace? Something like this: https://www.ebay.co.uk/itm/BIODENT-Keramikofen-Typ-SYSTOMAT-M-Vakuumpumpe-9887-/232481417446 Most of them are capable to reach 1200c but I'm not sure are those furnaces good enough...
  13. marcus4

    Endothermic gas atmosphere and 80Ni soft magnetic materials heat treatment

    Thanks MagBen. It seems that I will have to search better for this kind of service. This requirements are not so usual in my region.
  14. marcus4

    Endothermic gas atmosphere and 80Ni soft magnetic materials heat treatment

    Thanks MagBen. Happy New Year. I understand that Endo gas will cause some magnetics degradation but unfortunately I have no appropriate HT service in my region. That's why I ask this dumb question. Of course, I can experiment and find it myself but this kind of material is not cheap enough to do...
  15. marcus4

    Endothermic gas atmosphere and 80Ni soft magnetic materials heat treatment

    Thanks EdStainless, I understand. I have no problem with thin oxide layer since the parts are transformer laminations but carburization is something else. I'm not sure is that going to affect magnetics properties of the final part???
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