Wallwork HT UK - Heat Treatment and Hard Coating Services

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Cali-Coat

Cali-Coat is a specially developed coating for calibration and extrusion tools using the PVD (Physical Vapour Deposition) process. The Coating gives prolonged life of the calibrator in both brass and steel by reducing surface friction and increasing the surface hardness (2000/3000Hv). This is also combined with a very high level of adhesion that avoids flaking of the coating.

Other benefits of the Cali-Coat PVD process are that the coating follows the geometry of the tool with no build up on edges, cavities or vacuum slots. It also gives a replica finish of polished areas on the tool and therefore no polishing is necessary after coating.

Technical Information

Coating thickness	6-25µm
Hardness	2000 - 2500Hv
Coefficient of Friction	0.4 Static
Max Operating Temp	650 °C
Material Coated	Brass, Copper and Steel
Colour	Silver
Deposition	Electron beam PVD
Turnaround	5 - 7 days Inert, non-toxic.
Chemical Properties	Compatible with solvents, fuels and lubricant oils.

Case Study

Coating thickness	6-25µm
Application	uPVC Window Profile extrusion
Tool Materials	2316, 70/30 Brass
Finish	Polished
Extruded Product	uPVC window grade
Previous Treatment	Hard Chrome Plate
New Treatment	Cali-Coat 26 µm

Results

Previous treatment	17,000m
Cali-Coat	100,000+ m

Applications

Cali-Coat Graph The principal application for the Cali-Coat process in the treatment of extrusion and calibration tools used in the uPVC profile industry. The coating greatly reduces wear on tools and die sets resulting in longer production runs and reduced downtime.

The sustained high finish on the tooling produces product with enhanced quality and the low wear characteristics of the coating enabled dimensional accuracy of the product to be maintained over long periods.

Tecvac are also able to offer strip coatings and recoat tooling using the Cali-Coat process.