24.12/2021
Merry Christmas!
POLEMA wishes you a Merry Christmas and a Happy New Year!
28.10/2021
POLEMA will take part in the exhibition Metal Expo-2021
POLEMA JSC will take part in the 27th International Industrial exhibition “Metal Expo – 2021” which will take place from November 9 to 12.
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.
Nickel-manganese powder for diamond synthesis
Use
Fast-quenched powder of the nickel-manganese alloy AP-MnNi40 in flake form is widely used in producing synthesized diamonds of various sizes.
The powder is used as a catalyst in a reaction mixture with pure graphite.
Chemical composition
| Grade | Nominal composition, % | ||
| Mn | Ni | C | |
| AP-MnNi40 grade A1 | base | 40 | ≤ 0.3 |
| AP-MnNi40 grade A2 | base | 40 | ≤ 0.3 |
| AP-MnNi40 grade B1 | base | 40 | 0.8-1.5 |
| AP-MnNi40 grade B2 | base | 40 | 0.8-1.5 |
| AP-MnNi40 grade C1 | base | 40 | 1.5-2.5 |
| AP-MnNi40 grade C2 | base | 40 | 1.5-2.5 |
Powder classes by particle size
| Powder class | Base fraction, microns | Packed density, g/cm3 |
| 1 | ≤ 100 | 3.7-4.5 |
| 2 | 50-315 | 2.0-3.0 |
| 3 | 100-400 | 1.8-2.5 |
| 3A | 100-400 | 2.5-3.0 |
| 4 | 315-800 | 1.4-2.0 |
| 5 | 400-1250 | 1.0-1.3 |
| 6 | 400-1250 | 1.4-1.6 |
| 7 | 400-1250 | 1.65-2.0 |
Key technological advantages of the catalyst:
- high homogeneity of the reaction mixture with dispersive graphite;
- the ability to vary the packed density of the reaction mixture;
- the structure's high homogeneity and grain fineness;
- minimal content of impurities in the alloy;
- good plasticity and shapability ensure a wide field of contact between the catalyst and the graphite;
- the catalyst boosts the level of graphite transmutation and the hardness and sizes of the diamonds.
