23.12/2022
Merry Christmas and Happy New Year 2023!
27.06/2022
POLEMA’s QMS confirmed its compliance with ISO 9001:20015
POLEMA JSC confirmed the compliance of the current QMS with the requirements of ISO 9001:2015.
03.06/2011
Progressive materials for multi-functional vacuum coatings
Application fields of materials for multi-functional vacuum coatings, characteristics of sputtering targets and evaporable sources used for technologies of physical deposition of hardening, protective, decorative and light-reflecting coatings, resistive, switching and transparent electro conductive films.
24.05/2011
Molybdenum and tungsten products for production of leucosapphires
POLEMA JSC is the leading global manufacturer of chromium, molybdenum, tungsten products, metal powders and composite materials.
Cobalt alloys for coatings
Application
Cobalt alloyed powders are used in hardfacing 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 up to temperatures as high as 800°C.
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 | 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.
