Diamond synthesis device with super-large cavity

Abstract

The invention relates to a diamond synthesis device with a super-large cavity. The diamond synthesis device comprises the super-large cavity which is provided with an upper iron cup and a lower iron cup along the axial direction; a heating plate is arranged between the bottom of the upper iron cup and the bottom of the lower iron cup; the opening ends of the iron cups are respectively with a composite layer; an iron bowl is arranged on the outer layer of each composite layer, and the inner layer of each composite layer is of a composite structure formed by a dolomite cake, a graphite conductive ring and a dolomite ring; each graphite conductive ring is electrically connected with one end of a graphite column inside the corresponding iron cup through a piece of graphite paper, and the other end of the graphite column is electrically connected with the bottom of the corresponding iron cup; the super-large cavity is formed along the radial direction, the inner layer of the cavity is the iron cup wall, the middle layer of the cavity is formed by dolomite, and the outer layer of the cavity is formed by pyrophyllite. The diamond synthesis device has the advantages that the diamond synthesis device can be directly heated, and current passes through the graphite columns; conductive materials at two ends are changed into nonmetal materials from metal materials, so that the heat retaining property and the stability are greatly improved. The diamond synthesis device can be applied to large press equipment on a large scale, the forbidden zone that a super-large cavity for synthesizing diamonds cannot be directly heated is broken through, and the blank in the diamond industry is filled up.

Description

technical field [0001] The invention relates to a super large cavity diamond synthesis device. Background technique [0002] At present, the market competition in the superhard material industry is fierce. With the improvement of the single synthesis efficiency of domestic synthetic diamond, the price of diamond single crystal has dropped again and again. The equipment of domestic diamond manufacturers has been continuously upgraded, and the synthesis chamber has been continuously expanded. Due to the requirements of diamond growth conditions, with the prolongation of the heating time, the heat will continue to accumulate in the later stage of synthesis, resulting in a high temperature in the chamber of the synthesis block; What follows is a drop in internal pressure. The larger the cavity, the more difficult it is to control the temperature and pressure. Therefore, in the industry, indirect heating is used in the process of synthesizing diamonds in large cavities. ...

AI Technical Summary

Problems solved by technology

This diamond synthesis device uses an alloy heating tube and connects the external power supply and the steel ring of the alloy heating tube through a metal sheet to realize the heating inside the large cavity of the synthesis device. The steel ring is in a high-temperature zone and is easy to melt, causing high-pressure blasting; Good performance, so it is difficult to ensure good thermal insulation and stability of the synthesis device

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