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Cobalt alloys for coatings

Application

Cobalt allow powders are used in face-hardening technologies and in restoring machine components and equipment that operates in aggresive environments, abrasion and high temperature. Plasma coatings of cobalt alloys provide the surface with resistance to corrosion, erosion, and abrasive wear and maintain a sufficiently high hardness in temperatures as high as 800 0C.

The powders are applied to components of valves, valve seats, rotors, shafts, bearings in pumping devices in the oil & gas industry, parts of grinding machines, mixers, moulds, and, in drilling technology, to components of drill bits (3V16K powder), etc

Powders are produced by gas spraying (the particles are spherical).

Chemical composition

Grade Nominal composition, %
Co Cr W Ni Si B C Fe
AP-CoCr30Ni6WSiB (AN34) base 30 4.5 2 0.8 0.8 ≤3 
AP-CoCr30Ni2WSi (AN35) base 30 4.5 2 2 - 1.5 ≤3 
AP-CoCr30WSi (V3K) base 30  4.5 1.2  2.5 ≤0.1 1.1 ≤2 
AP-CoCr26W14Si (3V16K) base 26 14 ≤3  0.75 - 3.2 ≤5 
AP-CoCr33W18Si base 33 17.5 ≤3 1.5 - 2.3 ≤5

AP – Atomized Powder

Particle size (base grains), microns: -40 (45), -50,  less than 100, 40-100, 45-106, 63-200 (160), 80-160, 160-280, 160-400, 280-400 et al.

The hardness of coatings depends on the manner in which the coatings are sprayed and deposited. The hardness of coatings obtained using the plasma spraying method, following thermal treatment, ranges from 42-50 HRC.