Process for the production of porous products made from boron or boron compounds

Abstract

The invention relates to a process for the production of porous products of boron or boron compounds. This process comprises the following stages: (1) suspending the boron powder in a solution of an alkali metal salt, hydroxide and/or oxide, (2) then separating the powder from the suspension liquid by settling, (3) drying the thus separated powder to obtain an agglomerated powder, and (4) subjecting the thus obtained agglomerated powder to at least two heat treatments performed at different temperatures, the final stage of the heat treatment being performed at a temperature of 1500.degree. to 2200.degree. C. and the first stage being performed at a temperature below that of the final stage. The heat treatment can be performed in three stages, as shown in the attached graph.

Dependencies are inferred from the claim text.