Patent ID: 9139478
Filing Date: 2015-09-22
Classification: B01J,B82Y,C01B,C04B

Abstract:
1. A method for preparing a powder comprising carbon, silicon and boron, the silicon being in silicon carbide form SiC and the boron being in boron carbide form B4C, comprising: providing: a carbon-based precursor selected from the group consisting of gaseous alkanes, alkenes and alkynes, a silicon-based precursor which is a gaseous silane compound, and a boron-based precursor BX contacting said carbon-based precursor, said silicon-based precursor and a said boron-based precursor, to obtain a mixture of these three precursors; prior to said contacting, heating said boron-based precursor BX subjecting the resulting mixture to laser pyrolysis so as to obtain the powder comprising carbon, silicon and boron, the silicon being in silicon carbide form SiC and the boron being in boron carbide form B wherein the powder has a boron content ranging between 5% to 30% by weight relative to the total weight of the elements present in the powder.