METHOD FOR MANUFACTURING ARTICLES FROM FINE-GRAIN SILICONIZED GRAPHITE Russian patent published in 2019 - IPC C01B32/21 C01B32/956 C04B35/532 C04B35/565 

FIELD: manufacturing technology.

SUBSTANCE: invention relates to structural materials for machine building, chemical and metallurgical industry and can be used in production of support and thrust bearings, plain bearings, end seals of pumps intended for pumping liquids with abrasive particles, as well as facing plates. First, press mass is prepared on the basis of mixture of graphite powder of fraction of 30–63 mcm and fraction of 1–10 mcm with content of last 30–40 % of volume of powder mixture and polymer phenol-formaldehyde binder, which is represented by solution of liquid bakelite in isopropyl alcohol of conditional viscosity of 20 seconds. Then, billets are formed from obtained press mass, binder is polymerised and burn the workpiece. Burned workpiece is silicated by vapor-liquid-phase method by heating and holding for 1–2 h at 1,650–1,750 °C in silicon vapor at a vapor temperature higher than the temperature of the workpiece when heated from 1,300 to 1,650 °C by 150–10 degrees, respectively. Workpiece heating in range of 1,300–1,650 °C can be stepped with isothermal holding. After that, workpiece is cooled in silicon vapors in the absence of specified temperature difference. Temperature 1,650 °C corresponds to graphite powder of fraction of 30–63 mcm with a lower degree of graphitization, and temperature of 1,750 °C – with higher.

EFFECT: improving operational characteristics of items from siliconized graphite, as well as reproducibility of obtained results.

3 cl, 1 tbl