which alloys are used in electricity bulb and water boiler
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NichromeComposition of NichromeProperties of Nichrome1.Resistivity : 40 µΩ -cm2.Temperature coefficient of resistance: 0.0004 /oC3.Melting point: 1400oC4.Specific gravity: 8.4gm /cm35.High resistance to oxidationUse of NichromeUsed in making heating elements for electric heaters and furnaces.NoteNichrome is best suitable and ideal material for making heating element. It is having comparatively high resistance. When the heating element is heated first time, chromium of alloy react with oxygen of atmosphere and form a layer of chromium oxide on outer surface of heating element. This layer of chromiumoxide works as a protective layer for element and protect the material beneath this layers against oxidation, preventing the element wire from breaking and burning out. Heating elements made of Nichrome can be used for continuous operation at a temperature up to 1200oC.Kanthal“Kantahl” is trademark name for alloys made by composing Iron-Chromium-Aluminum (Fe-Cr-Al). These alloys are used in wide range resistance and heating applications.Composition of KanthalProperties of Kanthal1.Resistivityat 20oC: 145 µΩ -cm2.Temperature coefficient of resistance at 20oC: 0.000001 /oC3.Melting point: 1500oC4.Specific gravity: 7.10 gm /cm35.High resistance to oxidationUse of KanthalUsed in making heating elements for electric heaters and furnaces.NoteWhen the element made of “Kanthal” is heated first time, the aluminum of alloy react with oxygen of atmosphere and form a layer of aluminum oxides over heating element. This layer of aluminum oxides, is anelectrical insulatorbut have good thermal conductivity. This electrical insulating layer of aluminum make the heating element shock proof. Heating elements made of Kanthal can be used for continuous operation at a temperature up to 1400oC. Therefore, it is very much suitable for making heatingelements for Electric Furnaces used for heat treatment in ceramics, steels, glassand electronic industries.CupronickelCupronickel is also called as copper-nickel. It an alloy made by composing copper, nickel and strengthening elements such as iron and manganese.Composition of CupronickelProperties of Cupronickel1.Resistivity at 20oC: 50 µΩ -cm2.Temperature coefficient of resistance at 20-500oC : 0.00006 /oC3.Melting point: 1280oC4.Specific gravity: 8.86gm /cm35.High resistance to oxidationUse of CupronickelUsed in making heating elements for electric heaters and furnaces, for making coins.NoteCupronickel is having highelectrical resistance, high ductility and good corrosion resistance. Heating elements made of “Cupronickel” can be used for continuous operation at a temperature up to 600oC.
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Nichrome is used in electricity bulb and water boiler.
it is any of various alloys of nickel, chromium, and often iron (and possibly other elements). The most common usage is as resistance wire, although they are also used in some dental restorations (fillings) and in a few other applications.
it is any of various alloys of nickel, chromium, and often iron (and possibly other elements). The most common usage is as resistance wire, although they are also used in some dental restorations (fillings) and in a few other applications.
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