Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von Magnesiumdiborid (MgB 2 ) aus Magnesiumhybrid sowie davon durch Austausch von Mg durch andere Metalle bzw. von B durch andere Nichtmetalle abgeleiteter Verbindungen sowie die Herstellung von Magnesiumdiborid-Formkörpern.
Abstract:
The present invention is directed to a method for treating discolored natural diamond, especially Type IIa diamond and Type IaA/B diamond with nitrogen as predominantly B centers, for improving its color. The method includes preblocking and preshaping a discolored natural diamond to prevent its breakage in a high pressure/high temperature (HP/HT) press, placing said discolored natural diamond in a pressure transmitting medium which is consolidated into a pill. Next, the pill is placed into a HP/HT press at elevated pressure and elevated temperature within the graphite-stable or diamond-stable range of the carbon phase diagram for a time sufficient to improve the color of said diamond. Finally, the diamond is recovered from said press. Colorless and fancy colored diamonds can be made by this method.
Abstract:
A press assembly for pressurising a body, comprising a frame and a cartridge for applying load to the body, in which the frame comprises a bore for accommodating the cartridge. The press assembly further comprises an axial securement mechanism for securing the cartridge axially within the bore and a radial securement mechanism for securing the cartridge radially within the bore. The press assembly is configured such that the cartridge can be rotated in the bore between a locked condition and an unlocked condition. The radial and axial securement mechanisms are cooperatively configured with respect to each other so when the cartridge is in the locked condition, both the radial and axial securement mechanisms are engaged and when the cartridge is in the unlocked condition the radial and axial securement mechanisms are both disengaged and there is a clearance gap between the cartridge and the bore permitting the cartridge to be axially displaceable within the bore.
Abstract:
Disclosed is a method of growing a diamond, including the steps of providing a diamond seed in a reaction chamber; providing a protective layer above the diamond seed; providing a catalyst above the protective layer; providing a carbon source above the catalyst; applying pressure to the reaction chamber; heating the catalyst to a first temperature; holding the first temperature for a first duration; heating the catalyst to a second temperature; and holding the second temperature for a second duration.
Abstract:
A container assembly for use in a high-pressure press having a central pressure cell and a method of sealing a central pressure cell. The container assembly includes a container that receives a sample to be pressed, and a gasket distinct from the container, the gasket meeting the container at an interface. The container and the gasket are dimensioned to locate the interface within the central pressure cell.
Abstract:
An extra high voltage generator, comprising vertically symmetrical upper and lower guide blocks (1, 2) having pyramidal slopes formed in the upper and lower surfaces thereof, wherein upper and lower base blocks (3, 5) are formed of vertically symmetrical upper and lower pyramidal portions and disposed at the center of a vertical pyramidal recessed part formed of the vertical pyramidal slopes of the vertical guide blocks (1, 2), and an upper pyramidal block (12) is disposed between the upper pyramidal slope of the upper guide block and a press frame (14).
Abstract:
An electrically conducting n-type ultrananocrystalline diamond (UNCD) having no less than 10 atoms/cm of nitrogen is disclosed. A method of making the n-doped UNCD. A method for predictably controlling the conductivity is also disclosed.
Abstract translation:公开了具有不小于10 19原子/ cm 3的氮的导电n型超微晶金刚石(UNCD)。 制造n掺杂UNCD的方法。 还公开了可预测地控制电导率的方法。
Abstract:
A forming tool for a pressable material (2), particularly a high-pressure forming tool, has a die (1) surrounding a hollow working space, the die being surrounded by an armouring (5 to 10), which has a bandage (8) with a plurality of windings of a metal band. During operation, a pulsating electrical heating current (I1) is led through the material to be pressed, coaxially to the die (1). To prevent an excessive inductive heating of the armouring (5 to 10), particularly of the bandage (8), by the magnetic field of the heating current (I1), the invention provides that the windings of the bandage (8) are mutually electrically isolated, and that the magnetic field of the heating current (I1) is linked with at least one secondary current circuit (11), linked with the bandage (8), the electrical conductivity of the major part of the length of this circuit being at least equal to that of aluminium.
Abstract:
An apparatus for creating a high pressure comprises a multipiston system (1). Each piston (2) is compounded in its axial direction and consists of two parts, one of them being a working body (4) and another being a base (8). The wording body (4) is, in its turn, compounded in the direction perpendicular to the longitudinal axis (3) of the piston (2) and consists of a central insertion (21) and a ring (22) embracing it, both coaxially mounted and movable towards the test sample (7). The area of the butt end (23) of the central insertion (21) of the working body (4) is approximately equal to or less (as in this case) than the area of the central part (18) of the butt end (11) of the working body (4). The butt end (5) of the working body (4) is in direct contact with a hard, plastic under pressure, medium (6) surrounding the test sample (7). The butt end (9) of the base (8) is facing a means (10) for shifting the pistons (2), that means being common for all the pistons. The space between interfacing butt ends (11 and 12) of the working body (4) and of the base (8) is filled with a hard, plastic under pressure, medium (13). The surface of the butt ends (11 and 12) is provided with similar circular grooves (14 and 15, respectively), filled with a hard, platic under pressure, medium (20).