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Copper Alloys - Copper/Nickel Alloys

Chemical Formula

Cu/Ni Alloys

Topics Covered

Background

Key Properties

Applications

Sea Water Condensor Systems And Desalination Plants

Automotive Applications

Marine Applications

Coins

Resistance Wire

Thermocouples

Other Applications

Background

Sometimes called cupro-nickels, there exists a range of different copper nickel alloys that possess different properties and hence are suited to a range of different applications. Some of the better known copper nickel alloys include:

All copper nickel alloys consist of only one phase as the copper nickel binary system exhibits complete solid solubility.

Key Properties

Properties of copper nickel alloys vary with composition, however, some properties of copper nickel alloys are outlined below.

Copper-Nickel alloy Copper 90/10 and Copper 70/30

Copper rich alloys are:

The nickel content in these copper nickel alloys also enables them to retain their strength at elevated temperatures compared to copper alloys without nickel.

Applications of Copper Nickel alloys

Sea Water Condensor Systems And Desalination Plants

Due to the good resistance to sea water corrosion, the copper nickel alloy Copper 90/10 and copper nickel alloy Copper 70/30 are employed for sea water condenser systems and in desalination plants, as well as pipe work in chemical plants.

Automotive Applications

Due to the fact that the copper nickel alloy Copper 90/10 requires no surface protection and hence gives extra safety, this copper nickel alloy is being increasingly employed for brake and hydraulic suspension systems and cooling systems in cars and commercial vehicles.

Marine Applications

The good resistance to biofouling and sea water corrosion resistance of the copper nickel alloys, Copper 90/10 and Copper 70/30 alloys have lead to its use in applications such as cladding for ships' hulls, legs of oil rig platforms and sea water intake screens.

Coins

The copper nickel alloys composed of copper with 25% nickel with 0.05-0.4% manganese is commonly used for the manufacture of coins, medals and other semi valuable applications.

Resistance Wire

Due to the very low temperature co-efficient of electrical resistivity, the copper nickel alloys composed of copper with 45% nickel alloy is used for resistance wire in high precision resistors. This property of copper nickel alloys allows the resistor to operate at almost exactly the same resistance regardless of temperature.

Thermocouples

The copper nickel alloys composed of copper-45% nickel alloy is also used for thermocouples as it develops a high and uniform EMF when coupled with other metals such as copper and iron.

Other Applications

Copper nickel alloys are also used in cooling circuits, ammunition, sea water corrosion-resistant assemblies, condenser tubes.

Property Table of Copper Nickel Alloys

Material: Copper Alloys - Copper Nickel Alloys

Property Minimum Value (S.I.) Maximum Value (S.I.) Units (S.I.) Minimum Value (Imp.) Maximum Value (Imp.) Units (Imp.)
Atomic Volume (average) 0.0071 0.0073 m3/kmol 433.268 445.473 in3/kmol
Density 8.5 8.95 Mg/m3 530.638 558.731 lb/ft3
Energy Content 140 180 MJ/kg 15167.4 19501 kcal/lb
Bulk Modulus 130 170 GPa 18.8549 24.6564 106 psi
Compressive Strength 85 550 MPa 12.3282 79.7708 ksi
Ductility 0.03 0.44   0.03 0.44  
Elastic Limit 85 550 MPa 12.3282 79.7708 ksi
Endurance Limit 138 240 MPa 20.0152 34.809 ksi
Fracture Toughness 26 79 MPa.m1/2 23.6612 71.8937 ksi.in1/2
Hardness 580 1650 MPa 84.1219 239.312 ksi
Loss Coefficient 1.5e-005 0.00056   1.5e-005 0.00056  
Modulus of Rupture 85 550 MPa 12.3282 79.7708 ksi
Poisson's Ratio 0.34 0.35   0.34 0.35  
Shear Modulus 45 58 GPa 6.5267 8.41219 106 psi
Tensile Strength 267 624 MPa 38.7251 90.5036 ksi
Young's Modulus 120 156 GPa 17.4045 22.6259 106 psi
Glass Temperature     K     F
Latent Heat of Fusion 220 240 kJ/kg 94.5825 103.181 BTU/lb
Maximum Service Temperature 425 480 K 305.33 404.33 F
Melting Point 1384 1508 K 2031.53 2254.73 F
Minimum Service Temperature 0 0 K -459.67 -459.67 F
Specific Heat 384 386 J/kg.K 0.297162 0.298709 BTU/lb.F
Thermal Conductivity 19 66 W/m.K 35.5686 123.554 BTU.ft/h.ft2.F
Thermal Expansion 16 17 10-6/K 28.8 30.6 10-6/F
Breakdown Potential     MV/m     V/mil
Dielectric Constant            
Resistivity 11.7 36.3 10-8 ohm.m 11.7 36.3 10-8 ohm.m
Environmental Properties
Resistance Factors
1=Poor 5=Excellent
Flammability 5
Fresh Water 5
Organic Solvents 5
Oxidation at 500C 3
Sea Water 5
Strong Acid 2
Strong Alkalis 5
UV 5
Wear 5
Weak Acid 4
Weak Alkalis 5

JLC Electromet, Jaipur makes lamps components Nickel and nickel alloys for Superalloys, Defence Metals, Import Substitution , Metallurgy. Nickel Alloys in Nickel Wires and Nickel Strips. Aloso Nickel-Copper with Nickel-Iron as Cupronickel and Nickel Chromium for Electronics used in Nickel-Cadmium Batteries. Welding Rod Core Wires and Thermocouple wires with Compensating wires and Extension wires. Spark Plug wires as spark plug profile and spark plug side wire. Lamp materials with Lamp components for Lighting Bulbs and Tubelights. Dumet and Glass to metal seal.

Electrodes along with Lead-in-wire as Plating and plated wires. Coated wires, NPS aka Nickel Plated, Steel and Nickel Plated Bronze, Nickel Plated copper and Nickel Plating along with Tin Plating for Solder Plating. Nickel alloys as Wires, Strips, Rods, Cables, Stranded wires and Fine wires. Magnetic Soft Alloys for Magnetic Compensators.

Heating wires and Furnace elements along with Copper Nickel resistance wire and Resistance wire as Resistance strip for Shunts. Manganin as Constantan, Fecral, Kanthal, driverharries and Invar and Monel and Inconel and Nichrome. Metals for Bimetal Strips, Welding Rod Wires and Cladded Wires and High Permeability Alloys.

JLC Electromet, Jaipur These alloys are sometimes referred to as MONEL or NICORROS and made in Wires Strips Rods Cables Stranded wires Fine wires contain nickel with copper and small amounts of nickel and manganese into Nickel, nickel alloys, Nickel Wires and Nickel Strips. A typical alloy is the used in lamps components and as Magnetic Compensators Heating wires Furnace elements Copper Nickel resistance wire, Resistance wire, Resistance strip and Shunts. This contains Nickel and nickel alloys, Nickel Wires and Nickel Strips including Nickel-Copper, Nickel-Iron, Cupronickel and Nickel Chromium. There are also a small number ofnickel alloys in Lead-in-wire Plating plated wires, Coated wires NPS Nickel Plated Steel Nickel Plated Bronze, Nickel Plated copper, Nickel Plating, Tin Plating, Solder Plating.

Used in Superalloys ,Defence Metals, Electronics, Nickel-Cadmium Batteries, Welding Rod Core Wires, Thermocouple wires, Compensating wires, Extension wires, Spark Plug wires, spark plug profile, spark plug side wire, Lamp materials, Lamp components, Lighting, Bulbs, Tubelights, Dumet, Glass to metal seal, Electrodes. These alloys are used as Manganin, Constantan, Fecral, Kanthal, driverharries, Invar, Monel, Inconel, Nichrome where a higher strength is required compared to pure nickel. They have a wider range of environments such as Bimetal Strips, Welding Rod Wires, Cladded Wires, High Permeability Alloys, where they resist corrosion but in some specialised applications, such as in Metallurgy for Import Substitution, nickel alloys would be superior.

This group of nickel alloys are frequently sold under nickel alloy trade name specifications. Common trade names are Nickel alloy HASTELLOY, INCOLOY, INCONEL, Nickel alloy NICROFER, and NIMONIC. Nickel alloy HASTELLOY is a registered trade name of Haynes Intl. Lead-in-Wire in Nickel alloy INCOLOY, INCONEL, Nickel alloy MONEL and Nickel alloy NIMONIC are registered trade names of the INCO family of companies. Nickel alloy INVAR is a registered trademark of Imphy S.A. Nickel alloy MU-METAL is a registered trademark of Telcon Metals Ltd. nickel alloys NICORROS and Nickel alloy NICROFER are registered tradenames of Krupp UM GmbH Lead Wire

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