What is NiColoy®

NiColoy® is NiCoForm, Inc.'s class of proprietary electrodeposited Nickel-Cobalt alloys distinguished by the following combination of features:

  • Leveled, smooth matte to semi bright deposit with low internal stress.
  • High tensile strength.
  • Medium-to-high hardness.
  • High modulus of elasticity.
  • High corrosion resistance.
  • High purity.
  • Amenable to soldering, brazing and welding.

We produce two modifications of NiColoy® - high strength and high hardness, depending on the target application. The harder deposit is more suitable for mold inserts and mold repair applications. The high strength deposit exhibits a unique combination of elasticity and plasticity and is used to electroform bellows, diaphragms and other dynamic components. Please see the accompanying table and charts for a comparison of properties of the two types of NiColoy®.

As can be seen from the charts, the high strength alloy possesses a higher elongation than the high hardness one, and a somewhat lower strength and hardness. Such metals are conventionally described as 'ductile'. When stressed over its yield limit, the high strength alloy will plastically deform, rather than snap or crack in a brittle mode.

The high hardness alloy exhibits greater hardness and tensile strength, but lower elongation. This material's mechanical properties are closer to those of hardened tool steels, which dictates its application for mold inserts.

Comparative Properties of NiColoy® and Nickel
Property High Hardness, NiColoy® - H High Strength, NiColoy® - E Electroformed Nickel Comments
Ultimate Tensile Strength (psi/MPa) 210,000/1448 140,000/965 91,500/631 NiColoy® has greater tensile strength than Nickel
Yield Strength (psi/MPa) 185,000/1275 100,000/690 61,000/420 NiColoy® resists permanent deformation better than Nickel
Hardness, RC 45 - 55 35 - 50 < 20
Modulus of Elasticity in Bending (Kpsi/MPa) 24,000/165,000 22,500/155,000 21,000/145,000 NiColoy® has higher elasticity than Nickel
Poisson's Ratio 0.31 0.31 0.31
Shear Modulus (Kpsi/MPa) 9,200/63.4 8,400/57.9 8,000/55.2
Elongation at Break ( % ) 0.25 - 2 1.5 - 5 15 - 25
Typical Composition Nickel 95% Min.
Cobalt - balance
Nickel 90% Min.
Cobalt - balance
Nickel - 99.5% Min.
Max Temp Rating (°F/°C) 660-925/350-500* 660-925/350-500* 350/177 NiColoy® withstands substantially higher temperatures than electroformed Nickel
Coefficient of Thermal Expansion, mean linear at 20 °C, µm/m/°C, at 25°C 13.3 13.3 no data
Thermal Conductivity, W/m°K 87.5 87.5 no data

* The listed mechanical performance is maintained up to 350 ° C. Higher temperatures will result in temperature dependent reduction in performance characteristics.

Data contained in this table is for informational purposes only and may be revised at any time without prior notice. Nothing contained in this document should be construed as guaranteeing the material's suitability for a particular use or application.