Preparation method of heating element for ultrafine diamond synthesis

Abstract

The invention discloses a heating element for synthesizing ultrafine diamond and a preparation method of the heating element. The heating element is composed of a heating element base body and a heating body which is fixed on the outer wall of the heating element base body, wherein the heating element base body and the heating body are respectively of cylindrical structures with openings in the upper ends and the lower ends; and the heating body is symmetrically arranged by taking the center line of the axis of the heating element base body as the center. The metal heating body is compounded on the outer wall of the heating element base body, so that the synthesis temperature can be quickly increased to reach the diamond synthesis condition, and the synthesis quality and the synthesis efficiency of the ultrafine diamond particles are further improved. According to the preparation method, casting defects such as shrinkage and air pores of a conventional press-fit cast ingot are reduced by hot forging, the alloy plasticity and density uniformity are increased, and the stability of alloy resistors is increased.

Description

technical field [0001] The invention relates to the technical field of superhard material synthesis facilities, in particular to a method for preparing a heating element for ultrafine diamond synthesis used for synthetic diamond synthesis. Background technique [0002] The main method for the synthesis of superhard synthetic diamond is high-pressure and high-temperature method. The general synthesis temperature is 1200-1300°C, and the synthesis pressure is 5.0-5.5Gpa. At present, the indirect heating method is generally used in China, and the heating elements are graphite paper heating tubes and metal heating tubes. ;Due to the inherent defects of the heating method and structure, this heating method often has the disadvantages of low temperature at both ends and high temperature at the center; among them, the graphite paper heating tube has a small resistance and a slow heating rate; while the metal heating tube is generally 0.2mm metal strip It is welded, although the heat...

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Problems solved by technology

[0002] The main method for the synthesis of superhard synthetic diamond is high-pressure and high-temperature method. The general synthesis temperature is 1200-1300°C, and the synthesis pressure is 5.0-5.5Gpa. At present, the indirect heating method is generally used in China, and the heating elements are graphite paper heating tubes and metal heating tubes. ;Due to the inherent defects of the heating method and structure, this heating method often has the disadvantages of low temperature at both ends and high temperature at the center; among them, the graphite paper heating tube has a small resistance and a slow heating rate; while the metal heating tube is generally 0.2mm metal strip It is welded, although the heating rate has been improved, the uniformity of heat distribution is poor, and the synthesis quality is often poor; ultrafine particle diamond synthesis has the characteristics of large nucleation amount, short time, and fine particle size, and conventional heating elements are difficult to meet the synthesis needs.

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