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Core Pin and Core Coatings
These special coatings
change physical properties of the metal surface and create a finer
microstructure finish:
• Decrease soldering and erosion
• Lower breakage and friction
• Increase pin life while decreasing downtime
• Enable wire and EDM ability for difficult shapes
• Achieve precise gun drilling for cooling line
Prex provides two
special coating types for core pins and cores: CVD and PVD. CVD coating
involves heat-treating at about 2120 F (1000 C) to exact good bonding of
the applied chemicals with the metal. Due to distortion possibility
associated with the high heat-treat temperature, this process is limited
to thicker core pins and cores.
The PVD process heat-treats at about 1060 F (500 C) to provide a variety
of coatings with varying characteristics as shown in the table below. This
coating process has no limitations for size or shape of the core pin or
core.
Coating Characteristics
|
Coating |
Hardness |
Friction Coefficient |
Thickness (micron) |
Heat Resist. (F/C) |
Solder Resist. |
Erosion Resist. |
Durability |
Coefficient |
| Ti3 |
2300 HV |
0.4 |
4-8 |
1022/550 |
Good |
Better |
Good |
Better |
| CrN |
1700 HV
|
0.5 |
1-10 |
1292/700 |
Good |
Good |
Better |
Best |
| TiN |
2300 HV
|
0.4 |
3 |
1022/550 |
Better |
Good |
Good |
Good |
| TiALN |
3000 HV
|
0.4 |
3 |
1472/800 |
Best |
Best |
Best |
Good |
| Nitride |
65-74
HRC |
N/A |
N/A |
N/A |
Fair |
Fair |
Fair |
Good |
| Steel |
30-55
HRC |
N/A |
N/A |
N/A |
Poor |
Poor |
Poor |
Poor |
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Products
Die and Plunger
Lubricants
Die Lubricants
Plunger Lubricants
Die Lubricant Delivery Systems
AccuCast
Die Lubricant Accessories
Spray Guns & Nozzles
Core
Pins
Shot Sleeves
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