Ultra-high pressure spark plasma sintering system

Abstract

A system for ultra-high-pressure spark plasma sintering, characterized in that it comprises a six-sided press body, a high-power DC pulse power supply (1), and a high-pressure synthesis assembly block; wherein the six-sided press body has a frame and a hydraulic drive system for generating ultra-high pressure, wherein six carbide press hammers (6) collectively enclose a cubic space used to hold the high-pressure synthesis assembly block in which a sample is enclosed; wherein two poles of the high-power DC pulse power supply (1) are each connected via two conductive copper strips (2) to an upper and a lower large support block (3), wherein a steel ring (4) is mounted on each end section of the two large support blocks (3), and wherein the carbide press hammers (6) are embedded in the end sections of the steel rings (4).wherein small support blocks (5) are arranged between the hard metal press hammers (6) and the large support blocks (3), the small support blocks (5) each being in contact with the large support blocks (3) and the hard metal press hammers (6), wherein a high-frequency pulse current from the high-power DC pulse current supply (1) is transmitted to the hard metal press hammers (6) via the conductive copper strips (2), the large support blocks (3) and the small support blocks (5); wherein the high-pressure synthesis assembly block comprises a pressure transmission medium (13), wherein an insulating tube (14) is embedded in an inner wall of a cavity of the pressure transmission medium (13), wherein a graphite tube (11) is mounted on the insulating tube (14), the graphite tube (11) being connected at a top and a bottom to a hexagonal boron nitride tube (15),wherein an inner diameter and an outer diameter of the hexagonal boron nitride tube (15) are equal to those of the graphite tube (11), wherein a powdered sample (12) is arranged in the middle of the graphite tube (11), wherein the powdered sample (12) is in contact with an inner wall of the graphite tube (11), wherein conductive graphite plugs (10) are provided at both ends of the graphite tube (11), wherein a total length of the sample (12) and the conductive graphite plugs (10) is equal to the total length of the graphite tube (11) and the two upper and lower hexagonal boron nitride tubes (15), wherein above the conductive graphite plugs (10) in a direction away from the sample (12) a conductive graphite plate (9), a conductive molybdenum plate (8) and a conductive steel cap (7) are successively arranged, wherein the high-frequency pulsed direct current is successively passed through the hard metal press hammers (6), the conductive steel cap (7), the conductive molybdenum plate (8),The conductive graphite plate (9) and the conductive graphite plugs (10) are transferred to the sample (12) to form a closed circuit.

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