摘要:
A method for removing defects at high pressure and high temperature (HP/HT) or for relieving strain in a non-diamond crystal commences by providing a crystal, which contains defects, and a pressure medium. The crystal and the pressure medium are disposed in a high pressure cell and placed in a high pressure apparatus, for processing under reaction conditions of sufficiently high pressure and high temperature for a time adequate for one or more of removing defects or relieving strain in the single crystal.
摘要:
The invention is an element-doped diamond crystal having an increased compressive fracture strength wherein the concentration of element-doping impurities increases between the center and the surface of the diamond crystal, thereby generating tangential compressive stresses at the surface of the diamond crystal. The invention also includes methods of making the diamond crystal.
摘要:
Graphite is employed as a heat sink material, preferably with its c-planes perpendicular to the surface on which the heat-generating source is mounted at least in the portion in immediate contact with said source. The thermal conductivity of the graphite may be increased by heat treatment or by making it isotopically pure.
摘要:
A method is provided for making substantially transparent polycrystalline diamond film having a thickness greater than 50 microns which can be used in glazing applications and as a heat sink in microelectric applications. A mixture of hydrogen and methane is conveyed into a heated filament reacting zone which is adjacent to an appropriate substrate, such as a molybdenum substrate to produce non-adherent polycrystalline substantially transparent diamond film.
摘要:
A CVD diamond wire drawing die has smaller diamond grains adjacent an initial diamond growth surface with larger diamond grains adjacent an opposing surface with an opening having a wire bearing portion of substantially circular cross-section determinative of the diameter of the wire positioned more closely adjacent to the initial growth surface in a region of smaller grains than to final large grained opposing surface.
摘要:
A method is provided for making a single crystal diamond by chemical vapor deposition which utilizes a single crystal seed of a HPHT diamond and a hydrocarbon-hydrogen mixture, such as methane-hydrogen mixtures containing a effective amount of a metallocene, such as ferrocene. It has been found that the use of a metallocene in the hydrocarbon-hydrogen mixture suppresses secondary nucleation of polycrystalline diamond.