Matsayin Kayayin Yadda aiki: Nau'o'in Da Duk'iyar Karamin Matsayi da Fannin Amfani Da Su
An yi shi wani abu da ya zama kisa mai tafi masu kayan aiki a kan tafin Joule heating. Idan an yi electric current a kan resistance, za ta samun tafi. Ana amfani da abubuwa masu tafi a wurare masu tafi ko a wurare masu kayan aiki, kamar furnaces masu tafi, ovens masu tafi, heaters masu tafi, etc.
Ingantaccen aikin da tsawon abu masu tafi suna cikin kayan da ake amfani donsa. Kayan da ake amfani donsa ya kamata yana da:
Maimaitar tafin
Kayan da ake amfani don resistivity
Tsarin tafin da ke na kayan da ake amfani don resistance
Zamantakewa masu inganci
Siffar takaice masu inganci don fadada kayan da ake amfani donsa
Zamantakewa masu inganci a kan tafin a kan adadin sama
A nan, za a maimaita koyar kayan da ake amfani don abubuwan da suka tafi: Nichrome, Kanthal, Cupronickel, da Platinum. Za a tattara muhimmin kayan da ake amfani donsu, tsari, da ayyuka.
Me ce Nichrome?
Nichrome ita ce alamiya na nickel da chromium tare da kayan da dama. Ita ce babban kayan da ake amfani don abubuwan da suka tafi. Tsarin Nichrome shine:
| Element | Percentage |
|---|---|
| Nickel | 80% |
| Chromium | 20% |
| Iron | 0.5% |
| Manganese | 0.5% |
| Silicon | 0.5% |
Tsarin Nichrome
Nichrome tana da tsarin:
Resistivity: 40 µΩ-cm
Temperature coefficient of resistance: 0.0004 / °C
Maimaitar tafin: 1400 °C
Specific gravity: 8.4 g/cm<sup>3</sup>
Zamantakewa masu inganci a kan tafin
Ayyukan Nichrome
Ana amfani da Nichrome don fadada abubuwan da suka tafi a kan heaters da furnaces. Ita ya fi kyau a yi aiki a kan tafin tun 1200 °C. Idan an yi abu a kan tafin a lokacin farko, chromium a cikin alamiya ya kula da oxygen a cikin adadin sama kuma ya fara layirin chromium oxide a kan abin da suka tafi. Wannan layi ya taimaka a kan tafin da kuma ya baka tafin, kusa, da kuma ya baka abu a kan tafin.
Me ce Kanthal?
Kanthal ita ce sunan bayanan iron-chromium-aluminum (FeCrAl) alloys. Ana amfani da wannan bayanan a wurare masu tafi da ayyukan. Tsarin Kanthal shine:
| Element | Percentage |
|---|---|
| Iron | 72% |
| Chromium | 22% |
| Aluminum | 5.8% |
Tsarin Kanthal
Kanthal tana da tsarin:
Resistivity at 20 °C: 145 µΩ-cm
Temperature coefficient of resistance at 20 °C: 0.000001 / °C
Maimaitar tafin: 1500 °C
Specific gravity: 7.1 g/cm<sup>3</sup>
Zamantakewa masu inganci a kan tafin
Ayyukan Kanthal
Ana amfani da Kanthal don fadada abubuwan da suka tafi a kan heaters da furnaces. Ita ya fi kyau a yi aiki a kan tafin tun 1400 °C. Idan an yi abu a kan tafin a lokacin farko, aluminum a cikin alamiya ya kula da oxygen a cikin adadin sama kuma ya fara layirin aluminum oxide a kan abin da suka tafi. Wannan layi ita ce electrical insulator amma tana da thermal conductivity. Wannan layi tana taimaka abu a kan tafin don ya zama shock-proof. Kanthal tana da muhimmiyar tsari don fadada abubuwan da suka tafi a kan electric furnaces da ake amfani a kan heat treatment a ceramics, steel, glass, da electronic industries.
