The corrosion resistance is provided by the NiCr matrix while the wear resistance is provided mainly by the carbide ceramic phase.
While tungsten carbide coatings provide better wear resistance when temperatures are under 510°C (950°F), high velocity sprayed chrome carbide coatings mitigate abrasive and erosive wear at temperatures up to 750°C (1380°F).
Thermal sprayed chromium carbide coatings combat high-temperature wear due to the high wear resistance imparted by the hard carbide particles and the high temperature oxidation resistant nature of the Cr 2 O 3 oxide formed over both phases of CR3C2-NiCr.
Chrome carbide coatings are sprayed with Cr3C2-NiCr agglomerated and sintered powder -30 +5 microns.
Nominal compositionwt.%
Cr3C2base
Total carbon9.2-10.8
Nickel18-22
Chrome4.5-5.5 in the metal phase
Cr3C2-NiCr coating properties are influenced significantly by the spray process and spray parameters.
The abrasive wear rate for the chromium carbide coatings is controlled by several factors such as:
<1.0%
Bond strength to steel70 MPa @500µm10,000 PSI @0.020”Coating hardness, HV300950-1,100
Typical as-sprayed roughness Ra, micro-inch2-3.2 µm
80-120 µinch
Maximum coating thickness1 mm
0.040”
Maximum working temperature750°C
1,380oF
Kermetico HVAF applied chrome carbide coatings have excellent resistance to elevated temperature erosion and sliding wear.
Usually, this coating is used at elevated temperatures where tungsten carbide coatings do not work or when faster and a less costly finishing is necessary.
A specific characteristic of a Kermetico HVAF chromium carbide coating is that it remains ductile during the long-term service at high temperatures, in particular, above 600oC (1,100°F) .
The combustion temperature in the Kermetico HVAF process is well below the melting point of Cr3C2, which eliminates the possibility of the carbides dissolution into the nickel-chromium matrix during coating application.
As a result, there is no precipitation of carbides within the nickel-chromium matrix during the service of the HVAF coating and the metal matrix remains ductile.
Such precipitation of carbides is the main reason for the HVOF-sprayed coatings embrittlement and failure during high temperature service.
Sliding wear, erosion, and fretting at elevated temperatures:
Uniform high hardness and ductility, low stress and porosity lead to a substantial increase of service life of parts protected with Kermetico HVAF Cr3C2-NiCr coatings in comparison with HVOF. Our partner in India deposits chrome carbide coatings as well.
Please check other HVAF coating properties here.
Most Kermetico guns can spray chrome carbide coatings.
ome Carbide
spray rate – 16 kg (35.5 lbs.)/hourWe create equipment that helps materials scientists, engineers, and businessman achieve their goals.
We have installed more than 60 HVAF systems in the USA, Europe, Japan, and China.
Some of the systems are at work in Universities and National Labs, but most of them are used in production thermal spray shops.
We proudly design and produce our coatings and our HVAF thermal spray equipment in California and install it all over the world.
You can visit our R&D center in Benicia to meet our designers and watch our HVAF equipment in action.
We provide HVAF thermal spray coating services for customers in the San Francisco Bay Area in California, USA.
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