JP-2026012794-A5 -

Dates

Publication Date

20260511

Application Date

20251017

Description

Example 2 The high-pressure cell (HPC) includes a ceramic shell and a cylindrical graphite heater, which is locked from above and below by current-conducting washers. An insulating bushing with insulating washers at its ends is placed inside the heater. A substrate with a diamond crystal seed pressed inside is placed below the bushing, a metal catalyst is placed above the substrate, and a carbon source in the form of graphite is placed above the catalyst. The HPC is placed in a cubic press. A pressure exceeding 4.5 GPa is generated inside the cell by the press. Current is passed through the energized part of the cell. The heating power is increased at a rate of 30 W per minute. The resistance of the heater circuit is measured simultaneously with heating. When the heating power reaches 6.50 kW, a sharp increase of 10% in the heater circuit resistance is observed, which indicates the melting of the metal catalyst and the diamond phase transition of the carbon source. When the power value reaches 6.7 kW, the operator stops the process of increasing the power. After 300 hours of exposure, the operator turns off the heating. After the pressure is released, the HPC is removed from the cubic press. Inside the cell is a single crystal of diamond weighing 55 carats. The following is the invention as originally described in the application. <Claim 1> A method for monitoring the temperature of a metal catalyst in a process for manufacturing ultrahard materials, A step of continuously measuring the electrical resistance of a heater while heating a high-voltage cell (HPC), wherein the HPC has a housing in which the heater is arranged, locked from above and below by energizing washers, and an insulating sleeve having insulating washers at its ends is arranged inside the heater, and at least a carbon source and a metal catalyst are arranged inside the sleeve, The steps include detecting a sudden increase in the electrical resistance of the heater, A method characterized by including the step of identifying the point in time when the detected electrical resistance of the heater rapidly increases as corresponding to the melting of the metal catalyst. <Claim 2> A method for manufacturing an ultrahard material, A step of providing a high-voltage cell (HPC) having a housing in which a heater is arranged, which is locked from above and below by energizing washers, wherein the housing comprises an insulating sleeve having insulating washers at its ends, which is arranged inside the heater, and at least a carbon source and a metal catalyst are arranged inside the sleeve, The steps include: placing the high-voltage cell inside the high-voltage device; The steps include supplying the necessary pressure into the high-pressure cell, The steps include heating the high-voltage cell by supplying increased power to the heater, The steps include stopping the increase in power when the required temperature is reached, The steps include maintaining the high-pressure cell at the required temperature for a predetermined time, The steps include: ending the power supply to the heater and releasing the pressure; The steps include removing the high-voltage cell from the high-voltage device, A manufacturing method having the following characteristics: The steps include: continuously measuring the electrical resistance of the heater during heating; The steps include detecting a sudden increase in the electrical resistance of the heater, A method characterized by including the step of identifying the point in time when the detected rapid increase in the electrical resistance of the heater corresponds to the melting of the metal catalyst. <Claim 3> The method according to claim 2, wherein the heater has a cylindrical shape. <Claim 4> The method according to claim 2, wherein a substrate with a diamond crystal seed pressed inside is also arranged inside the sleeve.