Computer disk substrate, the process for making same, and the ma

Details Computer disk substrate, the process for making same, and the ma Computer disk substrate, the process for making same, and the ma

1997-06-03

1998-10-13

Group, Karl

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 642, 4283202, 428328, 4285395, 428694T, 428698, 501 87, 501 963, B32B 310, B32B 502, C04B 35503

Patent

active

058209654

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.

REFERENCES:
patent: 4598017 (1986-07-01), Bayer et al.
patent: 4605440 (1986-08-01), Halverson et al.
patent: 4623388 (1986-11-01), Jatkar et al.
patent: 4702770 (1987-10-01), Pyzik et al.
patent: 4718941 (1988-01-01), Halverson et al.
patent: 4834938 (1989-05-01), Pyzik et al.
patent: 4885130 (1989-12-01), Claar et al.
patent: 4946500 (1990-08-01), Zedalis et al.
patent: 4949194 (1990-08-01), MacPherson et al.
patent: 4988645 (1991-01-01), Holt et al.
patent: 5039633 (1991-08-01), Pyzik et al.
patent: 5045278 (1991-09-01), Das et al.
patent: 5273834 (1993-12-01), Hoover et al.
patent: 5296417 (1994-03-01), Claar et al.
patent: 5298468 (1994-03-01), Pyzik
patent: 5308422 (1994-05-01), Askay et al.
patent: 5480695 (1996-01-01), Tenhover et al.
patent: 5486223 (1996-01-01), Carden
patent: 5487931 (1996-01-01), Annacone et al.
patent: 5552204 (1996-09-01), Ahlert et al.
patent: 5614308 (1997-03-01), Claar
patent: 5626943 (1997-05-01), Tenhover
patent: 5633213 (1997-05-01), Aghajanian et al.
patent: 5648303 (1997-07-01), Nakamura
patent: 5670253 (1997-09-01), Chiu et al.
patent: 5712014 (1998-01-01), Carden

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