Carbon-carbon piston architectures

Details Carbon-carbon piston architectures Carbon-carbon piston architectures

1999-04-14

2000-09-12

McMahon, Margaret

Internal-combustion engines

Particular piston and enclosing cylinder construction

Piston

F02F 7506

Patent

active

061162027

ABSTRACT:
An improved structure for carbon--carbon composite piston architectures is disclosed. The improvement consists of replacing the knitted fiber, three-dimensional piston preform architecture described in U.S. Pat. No. 4,909,133 (Taylor et al.) with a two-dimensional lay-up or molding of carbon fiber fabric or tape. Initially, the carbon fabric or tape layers are prepregged with carbonaceous organic resins and/or pitches and are laid up or molded about a mandrel, to form a carbon-fiber reinforced organic-matrix composite part shaped like a "U" channel, a "T"-bar, or a combination of the two. The molded carbon-fiber reinforced organic-matrix composite part is then pyrolized in an inert atmosphere, to convert the organic matrix materials to carbon. At this point, cylindrical piston blanks are cored from the "U"-channel, "T"-bar, or combination part. These blanks are then densified by reimpregnation with resins or pitches which are subsequently carbonized. Densification is also accomplished by direct infiltration with carbon by vapor deposition processes. Once the desired density has been achieved, the piston billets are machined to final piston dimensions; coated with oxidation sealants; and/or coated with a catalyst. When compared to conventional steel or aluminum alloy pistons, the use of carbon--carbon composite pistons reduces the overall weight of the engine; allows for operation at higher temperatures without a loss of strength; allows for quieter operation; reduces the heat loss; and reduces the level of hydrocarbon emissions.

REFERENCES:
patent: 4683809 (1987-08-01), Taylor
patent: 4736676 (1988-04-01), Taylor
patent: 4909133 (1990-03-01), Taylor et al.
patent: 5370087 (1994-12-01), Guimond et al.
patent: 5769046 (1998-06-01), Ransone

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