Stock material or miscellaneous articles – Metal continuous phase interengaged with nonmetal continuous...
Patent
1995-06-29
1998-07-14
Bell, Mark L.
Stock material or miscellaneous articles
Metal continuous phase interengaged with nonmetal continuous...
428548, 428551, 428552, 428553, 428554, 501 87, 501 93, 501 96, B22F 326
Patent
active
057801649
ABSTRACT:
A hard drive disk substrate is formed of a multi-phase ceramic-based material having at least two phases with amorphous phases being present in an amount less than about 1 volume percent based on the volume of the ceramic-based material or at least one phase being free metal. A process for producing the ceramic-based disk substrate is produced by forming a flat disk of a porous ceramic and then infiltrating the porous ceramic with a metal whereby a multi-phase ceramic-based computer hard drive disk is produced. Additionally, a step of passivating the porous ceramic by elevating it to a temperature of about 1300.degree. to about 1800.degree. C. before the infiltrating step may be performed, such that the surfaces are passivated and the reaction kinetics can be controlled during the infiltrating step. A preferred composite material is made of a multi-phase boron carbide composite material including grains having peaks with an average roughness value, Ra, of between about 1 to about 200 .ANG., the roughness value being formed in situ by causing a micro hardness gradient of between about 19 and about 3200 Kg/mm.sup.2 in the various phases of the multi-phase boron carbide composite material.
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Deshmukh Uday V.
Han Chan
Nilsen Kevin J.
Perettie Donald J.
Prunier, Jr. Arthur R.
Bell Mark L.
The Dow Chemical Company
Troilo Louis M.
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