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PH coating for surface modification

PH coating is a hybrid surface treatment consisting of nitridation to strengthen the surface, which is carried out by using diffusion nitriding (PH-N), followed by ceramic coating, which is carried out by using the ion-plating method (PVD method).
PH coating improves wear resistance, corrosion resistance, thermal resistance, skid resistance, and adhesion resistance, lengthening the life of molds and mechanical parts.
Because PH coating is a low-temperature treatment, post-treatment distortion can be minimized.

Features

  • The hybrid surface treatment enables better adhesion than can be achieved when applying individual coatings.
  • The treatment is carried out at low temperatures (500°C or lower), virtually eliminating distortion of the base material. *1
  • Molds and parts can be re-treated following welding repairs. *2
  • Capacitive elements are not removed from the base material, so molds and parts can be re-treated any number of times.
  • Flame-hardended steel and molds can also be treated.

*1. Second hardened materials (SKD grade die steel, SKH grade high-speed tool steel) must be tempered at least twice at a high temperature (at least 520°C). Contact us for information about tempering temperatures lower than 520°C.
*2. Using the welding rod material recommended by Kohan Kogyo. Contact us for more information.

PH-N diffusion nitriding treatment

Name Hardness (HV) Nitriding diffusion depth (µm) Treatment temperature (°C)
PH-N 400 to 1300 10 to 250 400 to 530

Hybrid surface treatment
Physical vapor deposition (PVD) treatment

Name Hardness (HV) Film thickness (µm) Treatment temperature (°C)
PH-NCrN
PH-CrN
1600 to 2100 3 to 10 200 to 500
PH-NHPC2H
PH-HPC2H
2800 to 3100 3 to 8 300 to 500
PH-NHPC4S
PH-HPC4S
3100 to 3500 3 to 8 300 to 500
PH-NTiN
PH-TiN
1900 to 2300 2 to 4 300 to 500
PH-NTiCNX1
PH-TiCNX1
3000 to 3300 2 to 4 300 to 500
PH-NTiAlN
PH-TiAlN
2200 to 2500 2 to 4 300 to 500

Diamond-like carbon treatment

Name Hardness (HV) Film thickness (µm) Treatment temperature (°C)
PH-NDLC 2000 to 6000 Up to 3 100 to 250

Hardness comparison table

Hardness comparison table

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