Kopel - CuNi44Mn - Сuprothal® wire
The composition of the alloy
Copel is a copper-Nickel termoelektrodny alloy containing Nickel 43−44%, iron 2−3%, manganese 0.5 percent. The rest is copper. In its properties this alloy is close to the same — Constantan.
Copel has a high resistance to corrosion and heat resistance, without loss of basic properties to withstand temperatures up to 800 °C. the Alloy has a maximum thermoelectric power paired with copper, iron and chromel. The temperature coefficient of electrical resistance is quite low. These are the qualities of that alloy.
The density is 8.9 g/cm3 and melting point is 1290 °C. the Annealing is carried out in the temperature range of 800−850°C, and hot processing at a temperature of 1150 °C. the Ratio of the specific resistance is equal to 0.5 Omhm2/m, and the linear expansion is 14·10-6/°C. At 100 °C thermoelectric power equal to 6.95 V, and at 600 °C increased to 49,0 volts.
Kopel is widely used in pyrometry is often in the form of wire (Ø 0,2 — 3,2 mm), less tape and circle for the production of thermocouples, thermostats and compensation wires. The thermocouple consists of a pair of different conductors, soldered at one end and placed in the environment to measure the temperature (so-called «hot contact») and free the two ends placed in a thermostat (so-called «cold contact»). Due to the doping of the thermocouple of this type can withstand brief exposure to temperatures up to 1300 °C when operating in a hostile environment.
The magnitude of thermo-EMF the first place is the thermocouple Copel — chromel (TCA), which long-term use at temperatures up to 800 °C, second copper-Kopel, after — descending — Copel — iron (up to 760°C). Compensation wire transferred by thermoelectric power to the measuring device. For such wires is used cheaper wire: Constantan, chromel stamps or KM, etc. Copel Copel and Constantan used in measuring electrical appliances for the production standards of resistance.
The most common is mark Kopel Kg, 43−0,5. It is supplied in form of wire (Ø 0,10 — 12,0 mm), circle (Ø 12,0 — 100,0 mm) and ribbons with thickness of 0.1−5.0 mm, width, 3−600 mm.
|Alloy Copel Kg, 43−0,5, and its percentage composition|
|≤ 0.1||≤ 0.15||42.5 — 44||≤ 0.1||only 0.6||54.4 — 57.4||0.1 — 1|
|Physical properties at 20 °C Kopel KG, 43−0,5|
|Hardness, soft alloy HB 10 -1||90 MPa|
|Hardness, hard alloy HB 10 -1||195 MPa|
|The temperature of hot processing:||1150°C|
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