Molybdenum wire for coils?

[ProtestThe Hero]

So I tried e-cigs several years ago, but was not impressed with it at the time and switched back to analogs shortly afterwords. However, the tech has completely changed since then and I've recently come back to getting into all of this stuff again. I just ordered my first rba (KFL+) and this thought randomly occurred to me...

Would it be possible to use molybdenum wire for the coils?

I happen to have about 15ft of 0.14mm molybdenum wire laying around from an unrelated project. 0.14mm would be about 35 gauge (AGW). Molybdenum has one of the highest melting points of any metal (4753 °F), so its ability to withstand extreme temperatures without significantly expanding or softening makes ideal for use in things like automotive and aircraft components, electric vacuum devices, light bulb filaments, heating elements, high-temperature furnaces, armor, electrical contacts, etc. It's also used in steel alloys because of its high corrosion resistance and weldability. It's quite malleable as well, though I haven't tried to coil it up. Additionally, it would seem that there is currently no documented evidence of acute toxicity in humans, and there is actually some evidence that molybdenum deficiency has been linked to higher risk of esophageal cancer. Taking these things into consideration it would seem like this would be a good candidate for coil wire. However, I couldn't find a single page on the internets taking about it within the context of vaping.

Any thoughts?


Additional info from Wiki:
Electrical resistivity: (20 °C) 53.4 nΩ·m
Thermal conductivity: 138 W·m⁻¹·K⁻¹
Density (near r.t.): 10.28 g·cm⁻³

 

[Ohms Lawbreaker]

Fascinating. Can't wait to see what people think. I only use neutronium wire and tribble hair wicks, but so far all you said sounds logical.

 

[edyle]

So I tried e-cigs several years ago, but was not impressed with it at the time and switched back to analogs shortly afterwords. However, the tech has completely changed since then and I've recently come back to getting into all of this stuff again. I just ordered my first RBA (KFL+) and this thought randomly occurred to me...

Would it be possible to use molybdenum wire for the coils?

I happen to have about 15ft of 0.14mm molybdenum wire laying around from an unrelated project. 0.14mm would be about 35 gauge (AGW). Molybdenum has one of the highest melting points of any metal (4753 °F), so its ability to withstand extreme temperatures without significantly expanding or softening makes ideal for use in things like automotive and aircraft components, electric vacuum devices, light bulb filaments, heating elements, high-temperature furnaces, armor, electrical contacts, etc. It's also used in steel alloys because of its high corrosion resistance and weldability. It's quite malleable as well, though I haven't tried to coil it up. Additionally, it would seem that there is currently no documented evidence of acute toxicity in humans, and there is actually some evidence that molybdenum deficiency has been linked to higher risk of esophageal cancer. Taking these things into consideration it would seem like this would be a good candidate for coil wire. However, I couldn't find a single page on the internets taking about it within the context of vaping.

Any thoughts?


Additional info from Wiki:
Electrical resistivity: (20 °C) 53.4 nΩ·m
Thermal conductivity: 138 W·m⁻¹·K⁻¹
Density (near r.t.): 10.28 g·cm⁻³

assume diameter= 0.14mm
radius= 0.07mm = 0.00007m
53.4 nOhm m / Pi (0.00007m)sq = 3.5 ohm/m


resistivity of nichrome seems to be about 1.5 micro ohm meter; much higher resistance;
to use molybdenum you'd be using thinner longer wire;

we are using wire that gives about an ohm per inch;
that molybdenum wire gives about an ohm per foot; can you measure the resistance?

 

[MorpheusPA]

Electrical resistivity: (20 °C) 53.4 nΩ·m

Or, 5.34 x 10^-8. That's only about three times as resistive as copper, and 1/18th as resistive as Nichrome.

If you measure a three inch or so section, I'm betting resistance is rather low--so unless you're making a very, very sub-ohm coil, it wouldn't be particularly useful. Even with a sub-ohm coil, I'm not sure any battery could keep up with it.

 

[Aal_]

It looks more like a non resistance wire with that ohm rating

 

[ProtestThe Hero]

Mmkay. Thanks for the replies and info. It's getting late here and so my brain is getting all surly with me when I tell it to do math right now. I'm not sure about the exact resistance of the wire I have here. I believe the resistance I quoted from wikipedia is for pure molybdenum. I don't know if the wire I have will be significantly different but I can probably get an ohm reading from it tomorrow.

I was just hoping I might be able to save myself some time/money and actually find a use for this wire as I have no idea when I'm ever going to have another use for it.

 

[jimbill]

Got this from wiki for molybdenum and i don't think i would vape with this stuff.


Molybdenum dusts and fumes, which can be generated by mining or metalworking, can be toxic, especially if ingested (including dust trapped in the sinuses and later swallowed). Low levels of prolonged exposure can cause irritation to the eyes and skin. Direct INHALATION or ingestion of molybdenum and its oxides should be avoided. OSHA regulations specify the maximum permissible molybdenum exposure in an 8-hour day as 5 mg/m3. Chronic exposure to 60 to 600 mg/m3 can cause symptoms including fatigue, headaches and joint pains.

 

[Doctapeppa]

Another important aspect to look at is at what temperature it starts to fume at.

 

[ProtestThe Hero]

Melting point: 4753 °F
Boiling point: 8382 °F
Heat of fusion: 37.48 kJ·mol⁻¹
Heat of vaporization: 598 kJ·mol⁻¹
Molar heat capacity: 24.06 J·mol⁻¹·K⁻¹
Fumes formed above 400 °C (752 °F)

Fairly sure vaping temps to not get that high, but I'd be glad to see data that says othewise.