10-06/2019
Research and Technology Board has been organized at POLEMA JSC
04-06/2019
POLEMA JSC introduced new products at the exhibition “Metalloobrabotka-2019”
POLEMA JSC introduced new products at the exhibition “Metalloobrabotka-2019”
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,
Titanium and Ti alloys
Production
POLEMA has produced titanium powder since 1961 by reducing titanium oxide with calcium hydride – a method developed at the PMI FGUP named after I.P. Bardin. The choice of calcium hydride as the reducer is explained by calcium's high activity, which allows it to reduce almost all metal and non-metal oxides regardless of their thermodynamic activity without forming hard solutions and chemical bonds with the reduced metal. The calcium remaining after the chemical-metallurgical treatment of the reduced product is contained in small quantities in the reduced metal, bound with oxygen.
Use
Titanium powders reduced with calcium hydride have an irregular form and extended particle surface, thanks to which it shapes very well in a steel die mould at relatively low pressures, as well as hydrostatic shaping in elastic membranes. The powders roll well into bands and are sintered in a vacuum or a neutral atmosphere.
The titanium powders RP-Ti grade S, RP-Ti grade M, RP-Ti grade OM are used in medicine; in the food industry, for making regenerating filters used in systems for purifying drinking and mineral waters, juices and other beverages; in production of highly dependable pyrotechnical substances and porous bulk getters (degasifiers) with high sorption capacity; and in production of parts for watch mechanisms and acid-resistant equipment. The powders are also used for plasma and microplasma coating deposition.
Brades and chemical composition
| Grades | Ti | Admixtures, mass %, maximum | |||||
| N | C | H | Fe+Ni | Si | Cl | ||
| RP-Ti grade K-1 | base | 0,07 | 0,05 | 0,35 | 0,35 | 0,10 | 0,003 |
| RP-Ti grade K-2 | base | 0,20 | 0,05 | 0,35 | 0,35 | 1,00 | 0,003 |
| RP-Ti grade S-1 | base | 0,08 | 0,05 | 0,35 | 0,40 | 0,10 | 0,004 |
| RP-Ti grade S-2 | base | 0,20 | 0,05 | 0,35 | 0,40 | 1,00 | 0,004 |
| RP-Ti grade M-1 | base | 0,08 | 0,05 | 0,35 | 0,40 | 0,10 | 0,004 |
|
RP-Ti grade M-2 RP-Ti grade M (A)-2 |
base | 0,08 | 0,05 | 0,35 | 0,40 | 0,10 | 0,004 |
| RP-Ti grade OM-1 | base | 0,08 | 0,05 | 0,40 | 0,40 | 0,10 | 0,004 |
| RP-Ti grade OM-2 | base | 0,20 | 0,05 | 0,40 | 0,40 | 1,00 | 0,004 |
| No | Ti | Admixtures, mass % | |||||||||
| C | O | N | S | Ca | Fe | Ni | Si | Al | Mg | ||
| 1 | base | 0,046 | 0,25 | 0,08 | 0,002 | 0,22 | 0,050 | 0,17 | 0,040 | 0,01 | <0,01 |
| 2 | base | 0,024 | 0,30 | 0,060 | 0,002 | 0,18 | 0,040 | 0,057 | 0,038 | 0,05 | <0,01 |
| 3 | base | 0,045 | 0,28 | 0,050 | 0,003 | 0,30 | 0,030 | 0,040 | 0,032 | <0,02 | <0,02 |
Particle size, packed density and compressibility of powders
| Grades | Granulometric composition, mass %, by fraction, micron | Packed density, g/cm3 * | Compressibility, g/cm3, at a pressure of MP * | ||||
| +280 | +100 | +45(40) | -45(40) | 200 | 600 | ||
| RP-Ti grade K | ≤ 5,0 | Balance (remainder) | ≤ 10 | 0,89 | 2,70 | 3,50 | |
| RP-Ti grade S | ≤ 1,0 | n/a | ≥ 25 (35) | Balance | 1,15 | 2,60 | 3,24 |
| RP-Ti grade M | 0,0 | ≤ 2,0 | ≥ 15(25) | Balance | 1,02 | 2,44 | 3,35 |
| RP-Ti grade OM | 0,0 | ≤ 1,0 | ≤ 5,0 (5,0) | Balance | 1,36 | 2,72 | 3,48 |
* Average values (reference data)
Technical Specifications (TS) establish the packed density norm for RP-Ti grade K powder: 0.6-1.0 g/cm3 and the standardized granulometric composition for the powder RP-Ti grade M (A): +280 microns - 0.0%, +100 microns ≤ 1.0%, +45 microns – 15-40% (+40 microns – 25-50%), -45 (40) microns – remainder.
Sample powder particle shapes and distribution of particles by size
RP-Ti grade M. Distibution of particles by size
At the client's request, other requirements are possible for the chemical and granulometric compositions. In particular, for plasma coating deposition, a titanium product is produced with fractions of 40-100, 40-140, and 63-160 microns.
