Kopel - CuNi44Mn - Suprothal® wire
A fundamental point of view, the categorical, the less we know about the subject. Karel Capek.
Kopel is termoelektrodny copper-Nickel alloy contains 43−44% Nickel (Ni), 2−3% of iron (Fe), 0.5% manganese (Mn). Interest balance is copper (Cu). On its merits this alloy is close to another copper-Nickel alloy — Constantan.
High corrosion resistance and heat resistance, withstands heat up to 800 °C without losing the basic qualities. Has the maximum thermo EMF in a pair with copper, iron and chromel. The temperature coefficient of resistivity is minimal. This property is inherent only in this alloy.
Density of 8.9 g/cm3, the temperature coefficient of linear expansion equal to 14•10−6 °C-1, the specific resistivity of 0.5 MOhm·mm2/m. Thermo-EMF when температуре100°C is 6.95 volts and at a temperature of 600 °C increased to 49,0 volts. Melting point = 1290 °C, hot working the alloy can be at a temperature of 1150 °C and annealing of the alloy was carried out at 800−850°C.
The main field of application is the pyrometer, so the main form of rolled wire, at least — the ribbon and the circle. To obtain accurate data when measuring low temperatures using thermocouples with maximum thermal EMF. For a positive electrode using copper, iron, chromel, negative — alumel, Constantan, Copel. The value of thermal EMF leads thermocouple chromel-Kopel (TCA). She applied at t° up to 800 °C, followed by copper-Copel and iron-Copel (up to 760°C). Also, Kopel is used for the manufacture of countervailing wires. For these purposes, be made of wire of different diameters, but with strict technical requirements according to GOST 3044−84. The cost of wire depends on the diameter, the smaller the diameter, the relatively higher price.
Chemical composition copely Kg, 43−0,5% metal
|42.5 — 44||≤ 0.15||≤ 0.1||≤ 0.1||0.1 — 1||54.4 — 57.4||only 0.6|
The most common brand is kopali Kg, 43−0,5. It comes the form of wires (diameter of 0.10 — 12.0 mm), in the form of round (Ø 12,0 — 100,0 mm), and tape thickness, which is 0.1−5.0 mm, and the width of 3−600 mm.
The physical properties of the alloy kopelli KG, 43−0,5 at 20 °C
|Hardness, the alloy is soft HB 10 -1||Hardness, hard alloy HB 10 -1||Melting point, °C:||The temperature of heat treatment, °C:||Annealing temperature, °C:|
|= 85 — 90 MPa||= 185 MPa||1290||1000 — 1150||800 — 850|