A PROCESS FOR MAKING SINTERED SILICON CARBIDE COMPOSITES USEFUL AS ENGINEERING CERAMICS

摘要

A process for making sintered silicon carbide composites useful as engineering ceramics by preparing a suspension of a mixture of SiC & Al2O3 in cerium nitrate solution, maintaining a pH in the range of 10 to 12, pouring this suspension in ammonium hydroxide solution to obtain a gel-like mass, ageing the gel-like mass for a period in the range of 8-24 hours, filtering and washing the aged gel-like mass, drying the material at a temperature in the range of 110±5°C for 8-12 hours, grinding the dried mass to pass through 100 mesh B.S., pallatising the above said dried mass isostatically under 180-250 MPa, sintering the pressed pellets so obtained at a temperature in the range of 1750-1950°C for a period in the range of 0.25 hour to 1 hour in an inert atmosphere to obtain silicon carbide composites.