| 摘要 |
Self venting ablative carbon or graphite composite materials are prepared by interspersing low temperature degradable thread within the woven carbon or graphite cloth prior to impregnation with a phenolic or resin matrix. The degradable threads do not degrade during composite curing, but do degrade at a temperature less than the thermal decomposition (char) temperature of the cured composite material. Thus, as the threads decompose, they leave pores throughout the cured composite which are available to vent gaseous decomposition products produced as the resin matrix approaches the char temperature. Venting the resin decomposition products reduces internal pressure within the composite material thereby reducing the likelihood of spalling and ply lifting.
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