Ceramic matrix composite
Ceramic Matrix Composite (CMC) are materials currently (2009) being evaluated for use in aircraft engines. Their appeal lies in their strength (near that of metal), their resistance to high temperatures (2,200 °F capability), and their light weight (about a third of nickel; about half of titanium). They are formed using a silicon melt infiltration process in which silicon carbide fibers are encapsulated with ceramic resin; the resulting solid form is then provided with a heat-resistant coating.[1]
Potential applications
The engine partnership General Electric/Rolls-Royce is studying the use of stator vanes formed of CMC in the hot section of the F136 turbofan engine presently used in the Joint Strike Fighter.
The engine partnership CFM International is also considering the use of CMC parts to reduce weight in its Leap-X demonstrator engine program, which is aimed at providing next-generation turbine engines for narrow-body airliners.
Current studies are for CMC parts in stationary applications inside both the cold and hot sections of the engines, since stresses imposed on rotating parts would require further study.
References
- ^ Weight Revolution, Aviation Week & Space Technology, 170, 10 (9 March 2009), p. 36