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Surface Engineering Options from HEF

Layer Thickness / Surface Penetration & Processing Temperature

Layer Thickness / Surface Penetration & Processing Temperature

Range of ‘coating’ thickness:

  • PVD / CVD coatings: 2-10 μm
  • Liquid Nitriding treatments: 10-50 μm (hard compound layer)
  • Platings: 20-400 μm
  • Thermal spray: 50-400 μm

Comparative Hardness

Comparative Hardness

Why Vickers?

  1. Need to measure the hardness of only the coating or the transformed surface layer rather than the bulk material. The hardness indenter should not penetrate the ‘layer’ of interest → apply light loads on the indenter. Vickers uses lighter loads compared to Rockwell.
  2. Vickers indenter is pyramidal in shape (rather than Rockwell’s cone) – shallower penetration
Comparative Hardness