GB1131635A - High temperature and high pressure apparatus - Google Patents

Abstract

1,131,635. Very high pressure apparatus. H. ISHIZUKA. 28 Oct., 1965 [4 Nov., 1964; 18 Feb., 1965; 4 May, 1965], No. 45614/65. Heading B1X. In a very high pressure, high temperature apparatus of the type in which opposed pistons (11, 11<SP>1</SP>) enter an annular die member (13); there are provided a hollow sleeve-like body (15) of low compressibility (defined) material (e.g. Al 2 O 3 , MgO, SiO 2 , TiO 2 , ThO 2 , or BeO) and gaskets (22, 22<SP>1</SP>), the arrangement being such that the end surfaces of the pistons, said hollow body and said gaskets together define a reaction chamber formed thereby. As shown in Fig. 1, to which the above numerals refer, a further body 16, of agalmatolite is present, which together with discs 19, 19<SP>1</SP> of black lead or graphite, contains the charge. Steel discs 20, 21<SP>1</SP> steel rings 18, 18<SP>1</SP> and aga- Imatolite discs 17, 17<SP>1</SP> complete the assembly. The gaskets may be of agalmatolite and may be sheathed in copper or iron foil. The gaskets may alternatively be made of steatite, P.T.F.E. ,or polyethylene. Figs. 2A and 2B (not shown) illustrate alternative forms of gasket and Fig. 3 (not shown) illustrates an apparatus having pistons with a double taper. Further materials of construction, and dimensions, are supplied, and it is stated that pressures and temperatures above 40,000 at. and 1200-1500‹C may be sustained in the production of diamond from a mixture of nickel, chromium carbide and graphite.