Pseudoalloys, metal-graphite and metal-oxide composites are
basic materials obtained by powder metallurgy method, intendet
for electric contacts. Corrects choice of raw materials and
technological process parameters make possible obtaining of
contact materials with very good operational properties. High
density, very good electric and thermal conductivity, resistance
to oxidation, bonding, electro-erosion, and corrosion in various
madiums, and solderability are, among others, basic good
advantages of sintered electric contacts.
STANDARDS: PN-84/H-97042, BN-76/0886-27
| Chamical composition, density and hardness | |||||||||
| Grade | Composition [%] | Impurities Max. | Density [Mg/m3], Min. | Hardness [HB], Min. | |||||
| W | Cu | Ag | Ni | C | CdO | ||||
| WM20 | 75 ÷ 85 | 15 ÷ 25 | - | - | - | - | - | 14,5 | 180 |
| WS25 | 70 ÷ 80 | - | 20 ÷ 30 | - | - | - | - | 14,9 | 160 |
| S | - | - | rest | - | - | - | 0,2 | 9,5 | 35 |
| SN10 | - | - | rest | 9 ÷ 11 | - | - | 0,2 | 9,6 | 50 |
| SN30 | - | - | rest | 28 ÷ 32 | - | - | 0,2 | 9,4 | 70 |
| SG3 | - | - | rest | - | 2,7 ÷ 3,5 | - | 0,2 | 8,7 | 35 |
| SG5 | - | - | rest | - | 4,5 ÷ 5,5 | - | 0,2 | 8,4 | 30 |
| STK15d | - | - | rest | - | - | 14,5 ÷ 15,5 | 0,2 | 9,6 | 80 |
| Shape, dimensions | ||
| Type of contact profile | Materials on tungsten matrix | Materials on silver matrix |
| Dimensions [mm] | ||
| Rectangular with flat working surface | Transverse
dim. 5 ÷ 60 Height 3 ÷ 30 |
Transverse
dim. 4 ÷ 35 Height 1,2 ÷ 60 |
| Rectangular with cylindrical working surface | ||
| Rectangular with spherical working surface | - | |
| Round with flat working surface | Transverse
dim. 3 ÷ 25 Height 0,9 ÷ 3,2 |
|
| Round with spherical working surface | ||
| Cylindrical Sleeve |
Transverse dim. 5 ÷ 60 Height 3 ÷ 30 |
- |
Sintered electric contacts of different chemical composition, shape, and dimensions may be produced on customer's request.
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