초록 ▼

This invention describes the infiltration methods used to incorporate ceramic additives in carbon/carbon brake disc preforms. Aqueous vacuum infiltration techniques were employed. Both methods were effective in achieving homogeneous dispersion of ceramic additives throughout brake disc thickness. He

This invention describes the infiltration methods used to incorporate ceramic additives in carbon/carbon brake disc preforms. Aqueous vacuum infiltration techniques were employed. Both methods were effective in achieving homogeneous dispersion of ceramic additives throughout brake disc thickness. Heat treatment processes were developed to convert oxide additives to more refractory phases. Both temperature and N.sub.2 overpressure were precisely controlled during conversion. By using the additives, infiltration routes, and heat treatment schedules, brake disc friction material performance properties such as friction coefficient, friction coefficient stability, and brake disc wear rate are improved. The disclosed carbon/carbon brake discs can be used in aerospace, automotive and other friction material applications.

대표청구항 ▼

[ We claim:] [1.] A process of making a carbon/carbon composite friction material member, comprising the steps of:providing a colloidal ceramic solution comprising one of SiO.sub.2 and AlO(OH),controllably infiltrating the colloidal ceramic solution into a carbon/carbon preform,drying the preform,he

[ We claim:] [1.] A process of making a carbon/carbon composite friction material member, comprising the steps of:providing a colloidal ceramic solution comprising one of SiO.sub.2 and AlO(OH),controllably infiltrating the colloidal ceramic solution into a carbon/carbon preform,drying the preform,heating the preform to convert the colloidal ceramic to a respective refractory material of SiC and AlN,densifying the preform with elemental carbon to provide the preform with a matrix of carbon, andheat treating the preform to graphitize the carbon/carbon preform and carbon matrix and provide the carbon/carbon composite friction material member.