Coating wins slurry abrasion response test

Hardide surface technology claimed to outperform traditional hard-surfacing alloy coating by a factor of 2.5 to 1 in slurry abrasion response test.

Hardide Coatings has announced that its surface technology has outperformed a well-known hard-surfacing alloy coating by a factor of 2.5 to 1 in the ASTM G75 industry standard slurry abrasion response test.

The tests, conducted by an independent testing house in the US, were carried out on Hardide Tough and a nickel-based hard-surfacing alloy.

Tests were carried out over six hour periods with mass loss measurements recorded every two hours.

The test slurry used was 50% sand and 50% water.

The traditional carbide coating lost an average of 41.65mg after the full test duration of six hours compared with Hardide which lost an average of 16.5mg.

The mass loss rate for Hardide totalled 2.732mg/hr compared with 6.545mg for traditional carbide.

Jeff Rutland, Engineering Manager at Hardide, said: "These tests offer further evidence of how Hardide dramatically outperforms other technologies in terms of wear resistance".

"Together with its combination of features such as the ability to coat out-of-sight surfaces, its corrosion resistance and pore-free structure, Hardide offers major advantages over competing technologies".

"Furthermore, we also successfully coated Hardide on the hard-surfacing material that we were tested against".

The Hardide coating is a gas-phase CVD process that produces a hard wearing, low friction and corrosion resistant layer of tungsten carbide on the surface of tools and components.

It is deployed by CVD in a furnace to customer supplied components which are heated to between 500 and 550C.

Once at temperature, a chemical reaction takes place between the gases which then crystallise on the surface of the components producing a smooth layer of binder free tungsten carbide with abrasion, erosion and chemical resistant properties.

ASTM standard abrasion tests have previously shown that the wear rate for Hardide is up to 100 times lower than the wear of steel.

Hardide is exhibiting at the Offshore Technology Conference in Houston, Texas, USA, from 1st to 4th May 2006 on stand number 5680.

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