Boron-carbon-nitrogen material phase regulated dissolvent heat constant pressure synthesis method

Abstract

The solvent thermal constant-pressure synthesis method to adjust and control phase of boron carbonitride material comprises: preparing liquids for boron resource, carbon source and nitrogen source respectively; putting into the kettle; forcing 40~2000MPa constant pressure then heating the kettle to 220~1000Deg with 0.01~60Deg / min speed; after reaction, cooling to room temperature, and taking post-treatment to the product. Wherein, it can adjust and control the system temperature and pressure independently as well as the reaction speed and direction, and obtains large-size diamond, cubic boron nitride and carbonitride crystal block.

Description

1. Technical field [0001] The invention relates to a solvothermal constant-pressure synthesis method for regulating the phase of boron-carbon-nitrogen materials, which belongs to the field of new chemical materials. 2. Background technology [0002] As superhard materials with excellent performance, cubic boron nitride, diamond, and carbon nitride (collectively referred to as boron carbon nitride) have played and will soon play a pivotal role in daily life and industrial production. The artificial synthesis of these materials, especially Low-cost mass synthesis has always been the dream of human beings. In order to realize this ideal, various preparation methods have been developed and improved, among which the high temperature and high pressure method is the most mature. So far, using this method, the industrialization of cubic boron nitride and diamond has been realized. However, it is not difficult to see from a comprehensive analysis of this method that the preparation...

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Problems solved by technology

However, these methods have their own limitations: for example, in addition to controlling the reaction temperature, it is almost impossible for us to control other influencing factors in the reactor, so it is difficult to quickly optimize the preparation conditions to achieve low yield of the two materials. cost mass synthesis

In addition, when the reaction process is completed and the temperature begins to drop, the original cubic structure phase may also undergo phase reversal, causing multiple phases to coexist in the product, which seriously damages the selectivity of the reaction process and reduces the application value of the product.

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