What are nichelin and kanthal?

What are nichelin and kanthal?

What are nichelin and kanthal?
Nichelina: NiCr alloy, in varying amounts.
Kanthal: a FeCrAl alloy, in varying amounts.

Observe the following:
- Kanthalul A1 (22% Cr, 5.8% Al, remainder Fe) has a melting temperature of 1400 ° C, while the D (22% Cr, 4.8% Al, rest Fe) melts at 1300 ° C. Remember, it's melting temperature. Heat resistance temperature (255 ° C in air - liquid on it will be less), even I wonder how it is.
From my point of view, it is good and Kanthal D, so how's and A1, for our purpose. I'd still be curious as kanthalul type AE, which is said "developed to meet the extreme demands in fast response elements in glass top hobs and quartz tube heaters. It has exceptional form stability and life in spirals with large coil to wire diameter ratio ".
- Nikrothal - Nichrome (nichelina) are the same Nickel is a pretty good conductor. Would it not be resistive alloy with Chromium site (between 15-30%) depending on the type. Nichelina (think "Nikrothal" or "Nichrome" 80 is more popular, 80% Ni, 20% Cr) has a melting temperature of 1200 ° C. I mention this only as a comparison, but as I said above if kanthalului, the melting point is nonessential for me.
- I think this is already known, nichelina has resistivity less than kanthalului: N80 -> 1.09 Ω * mm² / m versus K A1 -> 1.45 Ω * mm² / m. Resistors can build larger (in terms of size) for the same ohmic resistance.
- There are several types depending on the alloy and purpose. Khantia APM, A-1, AF, D. on, where not meet iron and aluminum is called Nikrothal and refers only to the percentage of nickel in addition to chromium - Nikrothal 80, 70, 60, 40 (or as it is nichelina more say) more resistant to thermal wear if it contains less Cr anymore if it contains more Cr. Therefore for other derivatives resulting balance resistivity resistance in use.
- Appears a term - "emissivity" material:
definition: an object emissivity ability to emit or absorb energy. "Emitters" were emissivity perfect "1", emitting 100% of incident energy.

Kanthal A1 emissivity is 0.70, while the N80 0.88. For example, emsivitatea silver is 0.01 (ie reflects and transmits very good, does not absorb - can not be used as a radiator), while the "black body" is 1 (the energy emitted is equal to that absorbed - radiating perfect). That makes nichelina be better than radiating element (resistance in our case) than kanthalul. Energia "absorbed" is the one that turns into heat, our resistances.

To remember:
=> The two most important:
1) Al oxide (Al2O3) format kanthalului better adhere to the surface, so it is less contaminant. It is a better electrical insulator (best so for genesis sites) and best atmospheres resistant than carbonated Cr oxide (Cr2O3) nichelina format.
2) Al oxide (Al2O3 or alumina) formed on the surface kanthalului is light gray (if the temperature exceeds 1000 ° C - not our case) or darkens as 1000 ° C. Alumina has excellent electrical insulation properties and good chemical resistance in front of many compounds.
Cr oxide formed on the surface nichelinei (Cr2O3) is dark.
=> Kanthalul has 2-4 times longer life
=> Nichelinei most important advantage is that it has a high resistance to corrosion at room temperature. Oxide breaks off and evaporates more easily than thicker oxide formed on nonmetallic kanthalului.

Another reason for going only as Kanthal is formed on the surface oxide nichelinei is Cr oxide. He can be multi-valent, and is known (clearly shown) as penta and hexavalent oxides are carcinogenic. Now, higher valence oxides are formed only at high temperatures (say several hundred degrees up). But be sure not poison me every day, one bit, oxides of Cr?
On the other hand, alumina (aluminum oxide) ... We know that Al hydroxide causes dementia. It is possible that under certain conditions, to produce this hydroxide. But I think harder.

As an aside, it would be better than resistive alloy Nikrothal and Kanthal, but are based Copper and do not recommend them.
Cuprothal the CuNi alloy (red nichelina) - high resistivity, high temperature resistant;
Constantan: 55% Cu, 45% Ni, Cuproathal better as the resistivity-resistance-use;
Manganine 43 - CuMnNi Copper-Magnesium-Nickel (4% Ni, 11% Mn, rest Cu). The constant resistivity (both cold and hot) 86% copper, so much that can be bonded by a wire, letconul.

I use Kanthal, and if there is no breakthrough to change my beliefs, I will remain on Kanthal.

4Comments

    • Avatar
      Petru Avram
      mai 10, 2017

      KANTHAL A-1 si KANTHAL D se topesc la 1500 grade C (temperaturile de lucru sunt 1400 KANTHAL A-1 si 1300 KANTHAL D)

    • Avatar
      braia vasile
      dec 14, 2017

      Dupa parerea dvs.,pentru fabricarea rezistentelor la o aeroterma de 15Kw tip tun de caldura,ce sarma recomandati? Multumesc pentru raspuns. Braia

    • Avatar
      Sarah Young
      oct 4, 2019

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    • Avatar
      office.com/setup
      dec 4, 2019

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