Carbon burnt materials impregnated with metals and alloys
|Graphite-lead moulds of the grades ÀÃ-1500-Ñ05; ÀÃ-600-Ñ05 |
Are used to manufacture the parts of friction blocks operating in the conditions of dry, semi-dry and liquid friction upon steady or smoothly changing load (thickening rings for compressors, shells, sliding bearings for pumps , etc.). For the parts made of the above said materials it is recommended to use cast iron, steel, chrome dressing as the countershank material; permissible specific pressure is 20-25 kgc/cm2; permissible speed is 25 m/s. Permissible working temperature upon exploitation of products made of the above materials in the oxidizing, reducing and neutral media is 300° C. Amount of wear at permissible specific pressures and speeds in the conditions of dry friction in the air at the indoor temperature for 100 hours of operation is not more than 30 mkm. Graphite-lead materials are recommended to be used upon dry friction on steels and chrome dressing. Graphite-lead materials are not recommended for the operation with nonferrous metals and their alloys. The advisable surface roughness of the counterpart should be Ra 0.12, State Standart 2789-73.Size of moulds, mm
Note. Intensive heat elimination is necessary upon exploitation of the said grades of materials in the mode of dry friction. The friction coefficient of the above materials is within the scope of 0.7 to 0.15 in case of operation in the mode of dry friction.
| Dencity, (g/cm3), min.
| Compressive strength, MPa (kgc/cm3), min.
| Permissible specific load, kgc/cm2, max.
| Permissible working speed, m/s, max.
| Permissible working temperature, ° C, max.