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US 5,962,135 AGranted
Carbon/carbon friction material
AssigneeAlliedSignal Inc.
InventorsTerence Bryan Walker, Richard J. Donaldson, Philip J. Whalen
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AssigneeAlliedSignal Inc.
InventorsTerence Bryan Walker, Richard J. Donaldson, Philip J. Whalen
Estimating the term…
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.
A process of making a carbon/carbon composite friction material member, comprising the steps of:
A process of making an improved carbon/carbon composite friction material member requiring a reduced densification time and having an improved wear rate, comprising the steps of:
A carbon/carbon composite friction material member, comprising a carbon/carbon preform densified with a carbon matrix and graphitized by heat treating, and one of a colloidal ceramic refractory material comprising SiC and AlN distributed homogenously within the member by means of controllable infiltration of a colloidal ceramic solution comprising one of SiO.sub.2 and AlO(OH) subsequently dried and heated to convert the colloidal ceramic to the respective refractory material.
Dependencies are inferred from the claim text.