Abstract: The present invention relates to a process for preparing a composite, ultra-refractory, fibre-reinforced ceramic material obtained through the infiltration of carbon and/or silicon carbide fibres with a ceramic suspension comprising yttrium, lanthanum and/or scandium compounds, and the subsequent densification of the composite. The fibre-reinforced UHTC compounds obtained by the process can be used for making items intended for use in extreme temperature and pressure conditions.

Abstract: The present invention relates to a process for the production of fiber-reinforced composite materials with an ultra-refractory, high tenacity, high ablation resistant matrix with self-healing properties, prepared from highly sinterable slurries. The composite material is produced using techniques of infiltration and drying at ambient pressure or under vacuum, and consolidated by sintering with or without the application of gas or mechanical pressure.

Abstract: The present invention relates to a process for the production of fiber-reinforced composite materials with an ultra-refractory, high tenacity, high ablation resistant matrix with self-healing properties, prepared from highly sinterable slurries. The composite material is produced using techniques of infiltration and drying at ambient pressure or under vacuum, and consolidated by sintering with or without the application of gas or mechanical pressure.

Abstract: Converter device for converting energy from electromagnetic radiation, in particular concentrated solar energy, in electrical power, comprising a thermionic emitter (2) and an absorber (1) of electromagnetic radiation, configured to transform electromagnetic radiation energy to thermal energy, having an outer surface (10) configured to be exposed to electromagnetic radiation and an inner surface integrally coupled to the thermionic emitter (2), the outer surface (10) being provided with a sub-micrometer periodic surface structure, the thermionic emitter (2) being monolithically integrated on said inner surface of the absorber (1), the absorber (1) being made of a material selected from the group comprising or consisting of carbide or aluminium nitride-based ceramic materials, and pyrolitic graphite, the thermionic emitter (2) being made of a material selected from the group comprising or consisting of thin film diamond deposited through chemical vapour deposition (CVD), thin film titanium nitride (TiN) or mol