Process for obtaining composite, ultra-refractory, fibre-reinforced ceramic materials
AssigneeConsiglio Nazionale Delle Ricerche
InventorsLuca Zoli, Diletta Sciti, Laura Silvestroni, Antonio Vinci
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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.
Claims22
-19. (canceled)
A ceramic suspension comprising:
- (A) a mixture of solid ceramic phases comprising:
- (a) an amount greater than or equal to 55 vol. % of an ultra-refractory ceramic component selected from the group consisting of ZrB2, HfB2, TaB2, TiB2, NbB2, ZrC, HfC, TiC, NbC, TaC and mixtures thereof;
- (b) 0-30 vol. % of SiC;
- (c) 0.1-15 vol. % of at least one compound selected from the group consisting of scandium, yttrium and lanthanum compounds and mixtures thereof;
- and
- (B) a dispersant selected from the group consisting of water, organic solvents, liquid organic precursors of SiC, liquid organic precursors of carbon and mixtures thereof.
A composite material reinforced with a plurality of fibres selected from carbon fibres, silicon carbide fibres and combinations thereof, obtained by:
- (i) infiltrating the plurality of fibres with a ceramic suspension, thereby obtaining an infiltrated composite material;
- and
- (ii) drying the infiltrated composite material;
- wherein the ceramic suspension comprises:
- (A) a mixture of solid ceramic phases comprising:
- (a) an amount greater than or equal to 55 vol. % of an ultra-refractory ceramic component selected from the group consisting of ZrB2, HfB2, TaB2, TiB2, NbB2, ZrC, HfC, TiC, NbC, TaC and mixtures thereof;
- (b) 0-30 vol. % of SiC;
- (c) 0.1-15 vol. % of at least one compound selected from the group consisting of scandium, yttrium and lanthanum compounds and mixtures thereof;
- and
- (B) a dispersant selected from the group consisting of water, organic solvents, liquid organic precursors of SiC, liquid organic precursors of carbon and mixtures thereof.
A composite UHTC material obtained from a process comprising:
- (i) infiltrating a plurality of fibres selected from carbon fibres, silicon carbide fibres and combinations thereof, with a ceramic suspension, thereby obtaining an infiltrated composite material, and drying the infiltrated composite material, wherein the ceramic suspension comprises:
- (A) a mixture of solid ceramic phases comprising:
- (a) an amount greater than or equal to 55 vol. % of an ultra-refractory ceramic component selected from the group consisting of ZrB2, HfB2, TaB2, TiB2, NbB2, ZrC, HfC, TiC, NbC, TaC and mixtures thereof;
- (b) 0-30 vol. % of SiC;
- (c) 0.1-15 vol. % of at least one compound selected from the group consisting of scandium, yttrium, lanthanum compounds and mixtures thereof;
- and
- (B) a dispersant selected from the group consisting of water, organic solvents, liquid organic precursors of SiC, liquid organic precursors of carbon and mixtures thereof;
- (ii) consolidating the dried composite material at a temperature comprised in the range 1400°-2000° C.
Dependencies are inferred from the claim text.