Antifriction Carbon Materials
|Carbon burnt materials|
Are used to manufacture the parts of blocks for machines and hardware operating without lubricant and in the conditions of steady or smoothly changing load, for instance, piston rings for compressors (working media are ammonia and carbonic acid), drying cylinders, etc.
For the parts made of the materials AO-1500 it is recommended to use perlitic cast iron and chrome dressing as the countershank material; permissible specific pressure is 15-20 kgc/cm2; permissible speed is 10 m/s.
Size of moulds, mm
|Dencity, kg/m3 (g/cm3), min.
||1650 (1.65) |
|Porosity, %, min.
|Compressive strength, MPa (kgc/cm3), min.
||93.1 (950) |
For the parts made of the material ÀO-600 the recommended material of the countershank material is the same as for the parts made of the material AO-1500; permissible specific pressure is 10-15 kgc/cm2; permissible speed is 10 m/s.
Permissible working temperature upon exploitation of products made of the material AO-1500 in the oxidizing medium is 350-400° C, in the reducing and neutral media is 1300-1500° C; for the parts made of AO-600 material is accordingly 300-350° C and 1300-1300° 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 50 mkm.