stealthvape
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- Aug 1, 2012
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- 1,930
NiFe30 Wire
What the hell is NiFe30?
NiFe30 is an alloy of Nickel and Iron at around the 70/30 ratio. While we're calling this NiFe30 the exact ratio differs slightly as this is a proprietary NiFe alloy and the manufacturer wants to keep the exact ratio to themselves as part of our agreement.
However, they have given us a data sheet showing the exact balance of trace metals for the batch which is available here
It has a nice high TCR of 5000 K x 10-6/° C, sometimes written as just 5000 or 0.0050
Comparing that to Ni200 and Titanium
Ni200 6087
Our NiFe 5000
Titanium G1 3659
You'll see that Titanium has halfish of the TCR of Ni200 with NiFe sat somewhere in between them. This means that the temperature increments with NiFe30 won't be quite as small and accurate as Ni200 but more accurate than Ti.
Resistance wise using 0.40mm for comparison
Ni200 0.75 Ω/m
Our NiFe 1.55Ω/m
Titanium 3.65Ω/m
So half the wraps with NiFe as with Ni200.
For example, aiming for 0.15Ω using 0.40mm wire with a 3mm coil inner diameter
16 wraps of Ni200
7 wraps of NiFe30
3 wraps of Titanium G1
Or 0.32mm
10/11 wraps of Ni200
5 wraps of NiFe30
2 wraps ot Titanium G1
So while sacrificing a little TCR compared to Ni200 we're gaining resistance allowing us to use less wraps.
It gets better....
Contact coils should be possible, which despite what people say *coughriptripper* only those with the dexterity levels of a swiss watch maker have been able to achieve with Ni200. Also there's a good argument that micro/contact coils aren't the best choice with temperature control coils as the coil heats up from the middle throwing a spanner in the works as far as TC accuracy is concerned.
It's annealed. With the resulting hardness being somewhere in between tempered and annealed Ni200 and softer than annealed titanium. We ask about the possibility of having some tempered produced and were informed that while it could be produced as tempered they could not guarantee the TCR, which in the case of accurate temperature control is essential.
Lars at the steam engine calculator has added our NiFe30 to both the coil calculator and also the CSV generator for DNA 200 devices. It's important to choose Stealthvape NiFe as the TCR and resistance are different from other NiFe30's.
A quick comparison using 0.40mm/26g as a comparison
Crazy/Mesh/Etc - Both TCR and resistance are unpublished
Resistherm/Dicodes TCR 3200 - 2.56 Ω/m
Reactor wire - TCR 4000 - 3.36 Ω/m
Our NiFe30 TCR 5000 - 1.55 Ω/m
NiFethal70/Alloy120 TCR 5250 - 1.55 Ω/m
NiFethal52/Alloy52 TCR 4035 - 2.87 Ω/m
Only DNA200 devices, Dicode devices or those with a nickel purity setting can be accurately used with NiFe however there will probably be a temperature offset you can use much like people have been with Titanium wire on DNA40's etc. When we find out the right temperature offset we'll publish that information.
Our search for new and interesting rebuildable supplies will continue. Seems that there are similar alloys containing a little titanium that are suitable for normal wattage usage however we need to research this much more before we commit to a production run.
NiFe30 Wire
What the hell is NiFe30?
NiFe30 is an alloy of Nickel and Iron at around the 70/30 ratio. While we're calling this NiFe30 the exact ratio differs slightly as this is a proprietary NiFe alloy and the manufacturer wants to keep the exact ratio to themselves as part of our agreement.
However, they have given us a data sheet showing the exact balance of trace metals for the batch which is available here
It has a nice high TCR of 5000 K x 10-6/° C, sometimes written as just 5000 or 0.0050
Comparing that to Ni200 and Titanium
Ni200 6087
Our NiFe 5000
Titanium G1 3659
You'll see that Titanium has halfish of the TCR of Ni200 with NiFe sat somewhere in between them. This means that the temperature increments with NiFe30 won't be quite as small and accurate as Ni200 but more accurate than Ti.
Resistance wise using 0.40mm for comparison
Ni200 0.75 Ω/m
Our NiFe 1.55Ω/m
Titanium 3.65Ω/m
So half the wraps with NiFe as with Ni200.
For example, aiming for 0.15Ω using 0.40mm wire with a 3mm coil inner diameter
16 wraps of Ni200
7 wraps of NiFe30
3 wraps of Titanium G1
Or 0.32mm
10/11 wraps of Ni200
5 wraps of NiFe30
2 wraps ot Titanium G1
So while sacrificing a little TCR compared to Ni200 we're gaining resistance allowing us to use less wraps.
It gets better....
Contact coils should be possible, which despite what people say *coughriptripper* only those with the dexterity levels of a swiss watch maker have been able to achieve with Ni200. Also there's a good argument that micro/contact coils aren't the best choice with temperature control coils as the coil heats up from the middle throwing a spanner in the works as far as TC accuracy is concerned.
It's annealed. With the resulting hardness being somewhere in between tempered and annealed Ni200 and softer than annealed titanium. We ask about the possibility of having some tempered produced and were informed that while it could be produced as tempered they could not guarantee the TCR, which in the case of accurate temperature control is essential.
Lars at the steam engine calculator has added our NiFe30 to both the coil calculator and also the CSV generator for DNA 200 devices. It's important to choose Stealthvape NiFe as the TCR and resistance are different from other NiFe30's.
A quick comparison using 0.40mm/26g as a comparison
Crazy/Mesh/Etc - Both TCR and resistance are unpublished
Resistherm/Dicodes TCR 3200 - 2.56 Ω/m
Reactor wire - TCR 4000 - 3.36 Ω/m
Our NiFe30 TCR 5000 - 1.55 Ω/m
NiFethal70/Alloy120 TCR 5250 - 1.55 Ω/m
NiFethal52/Alloy52 TCR 4035 - 2.87 Ω/m
Only DNA200 devices, Dicode devices or those with a nickel purity setting can be accurately used with NiFe however there will probably be a temperature offset you can use much like people have been with Titanium wire on DNA40's etc. When we find out the right temperature offset we'll publish that information.
Our search for new and interesting rebuildable supplies will continue. Seems that there are similar alloys containing a little titanium that are suitable for normal wattage usage however we need to research this much more before we commit to a production run.
NiFe30 Wire
