초록 ▼

The invention provides a method for producing carbon/carbon composite honeycomb structures which have not only the mechanical properties associated with carbon/carbon materials but high thermal conductivities (>200 w/m-k) as well. A honeycomb structure comprising a low-modulus pitch precursor carbon

The invention provides a method for producing carbon/carbon composite honeycomb structures which have not only the mechanical properties associated with carbon/carbon materials but high thermal conductivities (>200 w/m-k) as well. A honeycomb structure comprising a low-modulus pitch precursor carbon fiber composite is heated or carbonized to drive off volitiles, densified at low pressure by CVD/CVI to provide a graphitizable carbon matrix, and then heat treated to graphitize both the carbon fiber and the carbon matrix. The resulting honeycomb structure has a high thermal conductivity with an increased fiber modulus and may be used, for example, for making heat transfer devices.

대표청구항 ▼

[ I claim:] [1.] A process of providing a high thermal conductivity honeycomb structure made from a low-modulus pitch precursor carbon fiber composite comprising initially a composite of low-modulus pitch precursor carbon fibers and a carbonizable thermoset resin, and a graphitic carbon matrix, comp

[ I claim:] [1.] A process of providing a high thermal conductivity honeycomb structure made from a low-modulus pitch precursor carbon fiber composite comprising initially a composite of low-modulus pitch precursor carbon fibers and a carbonizable thermoset resin, and a graphitic carbon matrix, comprising the steps of providing a low-modulus pitch precursor carbon fiber composite, heating the low-modulus pitch precursor carbon fiber composite to a temperature in the range of approximately 700-900.degree. C., and subsequently heat treating the composite to a temperature between approximately 2200-3200.degree. C., densifying the composite with graphitizable carbon by means of CVD/CVI at a low pressure and a temperature range of approximately 950-1200.degree. C., and heat treating the structure to a temperature between approximately 2200-7200.degree. C. to provide the honeycomb structure made from low-modulus pitch precursor carbon fiber composite and graphitic carbon matrix whereby the honeycomb structure has high thermal conductivity and an increased fiber modulus.