Computer disk substrate, the process for making same, and the material made therefrom

摘要: A hard drive disk substrate is formed of a multi-phase ceramic-based material having at least two phases with amorphous being present in an amount less than 1 volume percent based on the or one phase free metal. process for producing produced by forming flat porous ceramic and then infiltrating metal whereby computer produced. Additionally, step passivating elevating it to temperature 1300 °C 1800 before may be performed, such that surfaces are passivated reaction kinetics can controlled during step. preferred composite made boron-carbide including grains peaks average roughness value, Ra, between 200 A, value situ causing microhardness gradient 19 3200 Kg/mm2 various material.