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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 8000 С.
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
| Brand | Nominal composition, % | |||||||
| Co | Cr | W | Ni | Si | B | C | Fe | |
| AP-CoCr30Ni6WSiB (AN34) | base | 30 | 4,5 | 6 | 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.
