A PROCESS FOR MAKING SINTERED SILICON CARBIDE- NEODYMIUM OXIDE- ALUMINIUM OXIDE COMPISITES USEFUL AS ENGINEERING CERAMICS.

摘要

A process for making sintered silicon carbide-neodymium oxide-aluminium oxide composites useful as engineering ceramics which comprises preparing a suspension of a mixture of SiC & A12O3 in neodymium nitrate solution, maintaining a pH in the range of 7.35 to 8.0, 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., pelletising the ground 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 0.5 hour to 1 hour in an inert atmosphere.