CVD Tungsten Carbide Applications
CVD tungsten carbide coatings also show good potential for
use in the space sector, particularly for satellites. The Hardide
coating has shown no signs of fracture after 100 nano-impact
tests, which means that its fracture toughness can protect the
components. Titanium and other metals in vacuum can lose
their protective oxide layer and any moving metal parts can suf-
fer from galling. The coefficient of friction of the CVD coating is
the same in a vacuum as it is in an ambient environment and the
coating can provide excellent anti-galling protection for moving
joints such as robotic arms.
Changes in technology are also driving the need for an alternative to traditional coating materials. The ability to print 3D
components means that manufacturers can seamlessly join parts
together to make one larger, more complex component. These
more complicated shapes cannot be fully coated with line-of-sight techniques, such as HVOF, but internal surfaces can be
coated with CVD.
06 12:19 PM Page 1
Hardide tungsten carbide coatings have been used on
Eurofighter Typhoon jet components since 2005 and were recently technically approved by Airbus as a potential alternative
to HCP on some specific Airbus aircraft components. It met
the Airbus requirements for thick CVD tungsten carbide coatings and is a suitable alternative for hard chrome plating and
HVOF applied coatings. The coatings are also undergoing hard
chrome replacement tests with European helicopter manufacturer AgustaWestland, and a variety of tests for other applications in the sector.
Benefits of CVD Coatings
In industries where equipment and tools are pushed to the extreme of their operating capacity, companies are seeking ways to
improve performance while delivering a reduction in downtime
and meeting environmental regulations.
Other typical aerospace applications include pins, bushes,
bearings, hooks, catches, landing gear, flap tracks and slats,
sleeves, rods, valves, pistons, actuators, compressors, shafts, hydraulic and pneumatic cylinders.
Challenging environments – such as exposure to chemicals, heat, abrasion, friction and corrosion – put pressure
on the equipment, leading to failure of critical components,
downtime and loss of productivity. Our range of tungsten
carbide CVD coatings provides an effective solution for these
problems, ensuring extended life of components and less time
spent on maintenance.
Using the latest materials technology, the tungsten carbide
CVD coatings are a game-changing evolution in performance,
not just an improvement of existing coatings. The use of this
CVD process opens the door to enable a level of engineering
flexibility that is not possible with alternative technologies. CW
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