Patent ID: 8871141

Claim:
A process for preparation of a part comprising silicon carbide with an average grain size of less than 100 nm and a relative density of more than 97%, said process comprising: preparing a nanometric silicon carbide powder having a nanometric average grain size of less than 100 nm by laser pyrolysis; performing a preform formation step by cold compaction in a press of the nanometric silicon carbide powder; and performing a spark plasma sintering step of said preform, without sintering additives, at at least one predetermined temperature consisting of at least one thermal cycle lasting from 5 to 60 minutes for a temperature rise between 15° C./minute and 500° C./minute, so as to reach a maximum heating temperature between 1400° C. and 2000° C., so as to obtain a relative density of more than 97% and said nanometric average grain size, wherein said step of performing a preform formation step by cold compaction is performed by cold isostatic pressure.