Low-temperature densification of carbon fiber preforms by impreg

Details Low-temperature densification of carbon fiber preforms by impreg Low-temperature densification of carbon fiber preforms by impreg

1996-12-23

1999-03-16

Bell, Janyce

Coating processes

Heat decomposition of applied coating or base material

Coating decomposed to form carbide or coating carbonized

427379, 427294, 427384, B05D 302

Patent

active

058827269

ABSTRACT:
An improved method for producing low-cost carbon-carbon composites based on melt-impregnation of carbonaceous fiber preforms with low-melting point sugars is provided. Sugars such as fructose, ribose and sucrose are provided as impregnants via either ambient pressure or vacuum processing. Subsequent pyrolysis in air by heating to temperatures in the 325.degree. C. to 350.degree. C. range results in almost complete decomposition of the sugars to carbon. Frothing during the sugar melt-impregnation and pyrolysis process is minimized by the use of extended periods of isothermal pyrolysis or by the use of a catalyst. A hybrid process combining sugar melt-impregnation and pyrolysis with carbonaceous resin impregnation and pyrolysis is also provided as a densification enhancement. Three sugar melt-impregnation and pyrolysis cycles followed by a furfural alcohol impregnation cycle and a final sugar melt-impregnation cycle reduce the pore volume from sixty per cent in the preform to twenty-six per cent in the densified composite.

REFERENCES:
patent: 0935180 (1909-09-01), Williamson
patent: 0963291 (1910-07-01), Horton
patent: 2880120 (1959-03-01), Pelle
patent: 3026214 (1962-03-01), Boyland et al.
patent: 3174895 (1965-03-01), Gibson et al.
patent: 3233014 (1966-02-01), Bickerdike et al.
patent: 3238054 (1966-03-01), Bickerdike et al.
patent: 3462289 (1969-08-01), Rohl et al.
patent: 4472460 (1984-09-01), Kampe et al.

Affiliated with

Also associated with

Rating

Low-temperature densification of carbon fiber preforms by impreg does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Low-temperature densification of carbon fiber preforms by impreg, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low-temperature densification of carbon fiber preforms by impreg will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-815233