| 摘要 |
<p>1,215,944. Diamond. GENERAL ELECTRIC CO. 9 Nov., 1967 [1 Dec., 1966], No. 51077/67. Heading C1A. In a static pressure method for converting graphite to diamond, in a high pressure, high temperature apparatus, a quantity of wellcrystallized graphite the crystallites of which have their C-axes in substantial parallel alignment is placed in said apparatus with the C- axis disposed in the direction of compression of said graphite, the graphite is heated in the absence of a catalyst under static pressure at least as high as that of the solid diamond-solid graphite-liquid carbon triple point T 2 to a temperature of at least 1000‹ C., the temperature and pressure being such as to ensure operation below the line of threshold temperatures for the conversion of carbon to diamond (as generally represented by line Th), and the graphite so treated is returned to ambient pressure and temperature, to give a diamond product. The product consists mainly of hexagonal diamond and contains inclusions of graphite under pressure and has an X-ray diffraction pattern with prominent lines at 3-1, 2-19 and 2-06 A. Reference has been directed by the Comptroller to Specification 1,115,648.</p> |
