Anti-wear coating features 30% higher tungsten carbide content

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  • Resistance to abrasion, erosion and acids of chlorine and bromine halides
  • Superior to conventional tungsten carbide coatings
  • Also available for plasticizing units of other brands

At the recent NPE, Battenfeld-Cincinnati presented its new modular anti-wear concept for extruder processing units, the “STC“ (superior tungsten carbide). The coating provides anti-wear protection for processing both corrosive and strongly abrasive materials and can be tailored to customers‘ requirements.

Resistance to abrasion, erosion and acids of chlorine and bromine halides

This new coating material combines the abrasion and erosion resistance of TC hard metals with an extremely strong resistance to the acids of chlorine and bromine halides. If desired, the STC coating can be applied either just to certain parts of the screw, or the entire screw can be encapsulated in STC.

The new coating is particularly suited for PVC compounds with high filler content, PE with abrasive colorants, PP with talcum or fiberglass content, post-consumer regrinds or natural fiber composites.

Superior to conventional tungsten carbide coatings

The special feature of the new STC technology is that the tungsten carbides support each other as a result of their extremely high concentration and are also bonded in a hard metal matrix. Soldered or centrifuged coatings currently on the market come with a much lower tungsten carbide content, bonded in a comparatively soft matrix. In contrast to conventional tungsten carbide coatings, the new STC technology features a roughly 30% higher weight proportion of tungsten carbide, which enables the carbides to support each other.

Comparison of Battenfeld-Cincinnati’s TC-CoCr based STC barrel coating (left) with other Ni-TC based barrel coatings available in the market (right). Battenfeld-Cincinnati’s STC coating has about x100 smaller particle sizes and a 30% higher weight proportion of tungsten carbide, which enables the carbides to support each other. Additionally, the carbides are bonded in a hard metal matrix. This ensures maximized physical properties and therefore much higher wear resistance.

Comparison of Battenfeld-Cincinnati’s TC-CoCr based STC barrel coating (left) with other Ni-TC based barrel coatings available in the market (right). Battenfeld-Cincinnati’s STC coating has about x100 smaller particle sizes and a 30% higher weight proportion of tungsten carbide, which enables the carbides to support each other. Additionally, the carbides are bonded in a hard metal matrix. This ensures maximized physical properties and therefore much higher wear resistance.

The technical features of the STC technology at a glance:

  • ~ 30% higher tungsten carbide content
  • More resilient, harder matrix material
  • Optimized nano particle size for maximized physical attributes
  • Extremely dense, compact surface properties
  • Extremely high degrees of hardness combined with high toughness values
  • Maximum chemical and physical wear resistance for a longer service life
An abrasive paper test shows the maximized wear resistance of battenfeld-cincinnati’s STC coating compared to conventional TC-Ni based coating types.

An abrasive paper test shows the maximized wear resistance of Battenfeld-Cincinnati’s STC coating compared to conventional TC-Ni based coating types.

Also available for plasticizing units of other brands

The new STC tungsten carbide coating for plasticizing units has been developed as the result of an exclusive technology partnership with a undisclosed coating technology specialist. In this way, Battenfeld-Cincinnati is not only in a position to offer a hard metal coating for its own products, but also for other extrusion equipment brands.

The company has already a number of units in the field throughout Europe and is now looking for customer test sites in the USA and Latin America.

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