摘要:
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.
摘要:
The invention relates to a ceramic component comprising at least one stack of at least two layers of one-directional non-crimp carbon fiber fabrics embedded in a ceramic matrix containing silicon carbide and elemental silicon, characterized in that all adjacent layers within the at least one stack directly adjoin each other, the at least stack has a minimum thickness of 1.5 mm perpendicularly to the plane of the layers, and the ceramic matrix penetrates essentially the entire component.
摘要:
The present invention relates to a method of additively manufacturing a ceramic matrix composite material (10) comprising providing a ceramic fiber (3) and a powdery base material (2) for a ceramic matrix composite and layer-by-layer building up the ceramic matrix material (5) for the ceramic matrix composite by irradiating of a powder bed formed by the base material (2) with an energy beam (6) according to a predetermined geometry, wherein the base material (2) is remelted, solidified and adhesively joined to the ceramic fiber (3) in that parameters of the energy beam (6) are locally chosen such that in the contact region (CR) of the ceramic fiber (3) and the powder bed, the ceramic fiber (3) is only partly remelted.
摘要:
A process of producing a ceramic matrix composite component 10. The process includes positioning a plurality of ceramic matrix composite plies 60 on top of one another and forming a cavity 70 therein. At least a portion of the cavity 70 includes a terminal diameter sufficiently small to permit infiltration of a densifying material. The plurality of ceramic matrix composite plies 60 are densified to form a densified body. The densifying results in the portion of the cavity 70 including the terminal diameter being filled with densifying material and the cavity 70 is present in the densified body. A ceramic matrix composite having cavities therein is also disclosed.
摘要:
A pre-impregnated composite tape (20) is provided that includes: a matrix material (22); a plurality of fibers (16) forming unidirectional arrays (14) of tows encased within the matrix material (22); and a plurality of filler particles (24) dispersed between adjacent fibers (16) in the tape (20). The fibers (16) have a mean fiber diameter of about 5 microns and about 40 microns, and are included within the tape (20) at a volume fraction of about 15% and about 40%. The plurality of filler particles (24) have a log-normal volumetric median particle size, such that the tape (20) has a ratio of the log-normal volumetric median particle size to the mean fiber diameter that is about 0.05:1 to about 1:1. A method is also provided for forming a ceramic matrix composite.
摘要:
The invention relates to thermochemical treatment equipment (100) which includes: a reaction chamber (140); at least one gas inlet (104); and a gas preheating chamber (110) located between the gas inlet (104) and the reaction chamber (140). The preheating chamber (110) includes a plurality of perforated distribution plates (111-114) that are kept spaced apart, above one another. The preheating chamber (110) also includes, between at least the distribution plates facing one another, a plurality of walls (1110, 1120, 1130) defining gas flow paths between said plates (111-114).
摘要:
A novel ceramic matrix composite is disclosed for forming components that are operable in high temperature environments such those in gas turbine engines and the like. The ceramic matrix composite can include at least one layer of non-crimped fibers positioned substantially parallel to one another. A relatively small diameter elastic fiber can be constructed to stitch the non-crimped fibers together and a ceramic matrix may be deposited around the at least one layer of non-crimped fibers.
摘要:
A method of making multipart assemblies by producing single parts from ceramic composite materials that are machined and bonded together to form the multipart assembly. The method is used to make turbine engine vanes. The parts are woven 2D or 3D preforms containing a non-oxide matrix. The parts are joined by ceramic precursor materials such as polysilazanes, hydropolysilazanes, polysiloxanes or borosilazanes. After curing the polymer is pyrolysed in order to create a ceramic bond. Preferably a plurality of airfoils (330) is joined in between two platforms (310, 320) to form a turbine vane assembly (300).