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A method of manufacturing a ceramic matrix composite comprises forming a slurry comprising a ceramic sol, filler particles and a solvent and forming laminates of fibres (12). The laminates of fibres (12) are impregnated with the slurry and are stacked (14) on a mould (10). The stack (14) of laminate

A method of manufacturing a ceramic matrix composite comprises forming a slurry comprising a ceramic sol, filler particles and a solvent and forming laminates of fibres (12). The laminates of fibres (12) are impregnated with the slurry and are stacked (14) on a mould (10). The stack (14) of laminates of fibres (12) is covered by a porous membrane (16), a breather fabric (18) and a vacuum bag (20). The vacuum bag (20) is evacuated and is heated to a temperature of 60.degree. C. for 10 hours to produce a ceramic matrix composite. The ceramic matrix composite is then heated to a temperature of 1200.degree. C. at atmospheric pressure to sinter the ceramic matrix composite.

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1. A method of manufacturing a sandwich structure comprising at least two layers of ceramic matrix composite and a ceramic filler arranged between the at least two layers of ceramic matrix composite, the method comprising the steps of:(a) manufacturing each of the at least two layers of ceramic matr

1. A method of manufacturing a sandwich structure comprising at least two layers of ceramic matrix composite and a ceramic filler arranged between the at least two layers of ceramic matrix composite, the method comprising the steps of:(a) manufacturing each of the at least two layers of ceramic matrix composite using the steps of: (i) forming a slurry comprising a ceramic sol, filler material and a suspension medium, (ii) forming a plurality of laminates of fibers, (iii) applying the slurry to each of the plurality of laminates of fibers, (iv) stacking the plurality of laminates of fibers on a mold, (v) applying pressure to the stack of laminates of fibers to remove the suspension medium from the slurry to solidify the ceramic sol and thereby produce a ceramic composite layer, b) arranging the at least two layers of ceramic matrix composite into a predetermined shape such that there is a space between the at least two layers of ceramic matrix composite, c) filling the space between the at least two layers of ceramic matrix composite with a ceramic filler material, d) heating the at least two layers of ceramic matrix composite and ceramic filler material to produce the sandwich structure.