Pyrolytic Carbon Coating Ceramic Matrix Composite

Developed a series of ceramic matrix composite material systems using the polymer impregnation pyrolysis pip process.

Pyrolytic carbon coating ceramic matrix composite.

The resulting ceramic matrix composite cmc materials have a unique combination of properties. The main reason for this is a remarkable weight reduction. In c cs with pyrolytic carbon tensile strengths in the fiber direction of 1000 1400 mn m 2 have been reported which correspond to 80 90 of the fiber properties translation 62 63. Vinci et al found that sic contents over 15 vol in a zrb 2 sic matrix ensured the formation of a homogeneous protective borosilicate layer over the sample that minimized c f degradation and burnout during 1 minute oxidation tests at 1500 1600 c.

Ceramic matrix composites cmcs are a special type of composite material in which both the reinforcement refractory fibers and matrix material are ceramics. The carbon coating has. In some cases the same kind of ceramic is used for both parts of the structure and additional secondary fibers may also be included. Carbon short fibers pyrolytic carbon cvd c sic composites.

32 pyrolytic carbon pyc coatings have also been shown to protect c f from processing. Carbon fibers are the optimum reinforcement for many composite systems and are the constituent of choice for hot structures because of their. The use of coatings to protect carbon fibers and carbon carbon cc composite from chemical attack at elevated temperatures is important for the development of lightweight structural materials for use in advanced aircraft and aerospace applications. Ceramic matrix composites cmcs are a subgroup of composite materials as well as a subgroup of ceramics they consist of ceramic fibers embedded in a ceramic matrix.

The ceramic fibres were coated with thin layers 100 nm of pyrolytic carbon to prevent diffusion between fibre and glassy matrix. Silicon carbide ceramic matrix composites coi ceramics inc. 3 1 2 mechanical properties of composites with pyrolytic carbon matrix. Then sem xrd and other methods were used to test the microstructure flexural strength fracture toughness and static.

At lower heat treatment temperature htt 1500 c composites with high strength. This process is versatile and robust well suited for the fabrication of complex components. Introduction c arbon fiber reinforced composites with ceramic cmc carbon cfc or metal mmc matrix are interesting materials for many applications e g in the field of the automotive industry. Both the matrix and the fibers can consist of any ceramic material whereby carbon and carbon fibers can also be considered a ceramic material.

In this paper c f sic zrc c f c sic zrc composites which the pyrolytic carbon pyc coating with the thickness of 0 1 μm 0 3 μm and 0 5 μm were prepared by chemical vapor deposition cvd process combined with precursor infiltration and pyrolysis pip process.