Ceramic honeycomb body for lightweight structures and corresponding production method

The honeycomb body (1) as claimed in one of the preceding claims, characterized in that a mass fraction of free carbon in the matrix amounts to at least 1 wt. %, in particular at least 10 wt. % and/or at most 25 wt. %.

The honeycomb body (1) as claimed in one of the preceding claims, characterized in that a mass fraction of the support in the composite material amounts to 5 wt. % to 80 wt. % and preferably to 10 wt. % to 50 wt. %.

The honeycomb body (1) as claimed in one of the preceding claims, characterized in that the support is produced from fibers, and in particular from a woven fabric, preferably from a single-ply woven fabric and particularly preferably from a linen weave fabric.

The honeycomb body (1) as claimed in one of the preceding claims, characterized in that the honeycomb cells (12) are hexagonal, in particular hexagonal with a free diameter in the L/W plane of 50 mm, in particular of ≤19.2 mm, preferably ≤9.6 mm and particularly preferably ≤3.2 mm.

A honeycomb blank (26) as an intermediate product for producing a honeycomb body (1) of fiber-reinforced carbide ceramics, the honeycomb blank (26) comprising honeycomb cells with a cross-section in the L/W plane, in particular a polygonal cross-section, cell walls of the honeycomb cells being produced from a support material, in particular from a woven or laid fabric made of fibers, which is impregnated with a carbon-containing matrix mixture,

• characterized in that the matrix mixture comprises dispersed silicon particles, wherein the mass fraction of the silicon particles in the matrix mixture in the central region of the height of the cell walls along a T direction perpendicular to the L/W plane deviates by less than 20 wt. %, in particular less than 10 wt. % and preferably by less than 1 wt. % from the mass fraction of the silicon particles in the matrix mixture in the end regions of the height of the cell walls.

A flat semi-finished product as a curable intermediate product for producing fire-resistant fiber composite lightweight structures, in particular laminates, such as for example cover layers (44) for fire-resistant lightweight sandwich structures, comprising a support material which is impregnated with a carbon-containing matrix mixture, the support material comprising a woven or laid fabric made of fibers, in particular carbon fibers and/or ceramic fibers, and the curable matrix mixture comprising at least one precursor for a thermosetting polymer, in particular a phenolic resin,

• characterized in that the curable matrix mixture comprises dispersed silicon particles, wherein the matrix mixture in particular has a mass fraction of the silicon particles of 20 wt. % to 60 wt. % and preferably 25 wt. % to 45 wt. %.