Nisil is an austenitic nickel-silicon alloy (NiSi alloy) used for the negative leg of thermocouple type N. It offers better oxidation resistance than type E, J and K thermocouples.
Nisil alloy cannot be exposed to sulphur-containing gases. This thermocouple alloy is the most recent one among the different types covered by the international standards.
Chemical composition (nominal)
|Yield strength||Tensile strength||Elongation|
Properties are measured on wire Ø 2 mm
|Electrical resistivity at 20°C Ω mm2/m||0.36|
|Temperature °C||Thermal Expansion x 10-6/ K|
|20 - 100||17|
|W m-1 K-1||17|
Standard sizes for thermocouple strip range from thickness 0.10 to 3.0 mm (0.0039 to 0.181 inch) and width from 4 to 195 mm (0.157 to 7.68 inch).
|Melting point °C||1420|
|Magnetic properties||The material is non- magnetic.|