High-temperature and high-pressure synthesis device and method for diamond hard alloy compact

Abstract

The high-temperature and high-pressure synthesis device comprises an outer salt pipe, an inner salt pipe and pyrophyllite, the pyrophyllite is provided with through holes used for assembling the outer salt pipe and a conductive steel ring, the outer salt pipe is arranged in the pyrophyllite, a carbon pipe is assembled in the outer salt pipe, the inner salt pipe is assembled in the carbon pipe, a metal cup is placed in the inner salt pipe, and the metal cup is placed in the conductive steel ring. The upper end and the lower end of the through hole of the pyrophyllite are provided with the carbon plates and the conductive steel rings, and the carbon plates are attached to the outer salt pipe, the carbon pipe, the inner salt pipe and the salt plates. During application, the carbon tube simultaneously heats the inner salt tube and the outer salt tube to simultaneously generate two isostatic pressing areas formed by molten salt, namely an inner isostatic pressing pool and an outer isostatic pressing pool, and the inner isostatic pressing pool provides a hot isostatic pressing environment which is suitable for sintering the diamond hard alloy compact and has equal pressures in all directions; the outer isostatic pressing tank provides a pressure environment with uniform stress for the carbon tubes in the outer isostatic pressing tank, and the stress of the carbon tubes is balanced; and the sintering quality of the diamond hard alloy compact is obviously improved.

Description

technical field [0001] The invention relates to a synthesis device and method of a diamond carbide composite sheet, in particular to a high-temperature and high-pressure synthesis device and a synthesis process thereof under double-cell hot isostatic pressing conditions. Background technique [0002] Diamond cemented carbide composite sheet is sintered by diamond powder and cemented carbide base under high temperature and high pressure conditions. It has high hardness, high wear resistance of diamond and impact resistance of cemented carbide. It is used to manufacture diamond drill bits. It is finally used in the exploration and exploitation of oil, natural gas and shale gas. [0003] At present, the production process steps of diamond cemented carbide composite sheets are as follows: ①Purify the diamond powder with acid and alkali; ②Sandblast the surface of the cemented carbide base to remove impurities; Put the fine powder into a metal cup with a high melting point; ④Put ...

AI Technical Summary

Problems solved by technology

Due to the very high external pressure conducted by pyrophyllite, the carbon sheet and carbon tubes that undertake the heating function will be deformed, resulting in spatial distortion and deformation of the heating field, affecting the spatial uniformity of the thermal field, which in turn affects the heating uniformity of the metal cup, and finally makes The diamond carbide composite sheet in the cup is heated unevenly during the sintering process, which reduces its sintering quality

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