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Preparation of lithium boron nitride (Li3BN2) by preparation of lithium nitride

wallpapers Tech 2021-04-26
Li3BN2 is an important catalyst for the synthesis of cubic boron nitride superhard material and has been used in the industrial production of cubic boron nitride synthesis. The hardness of cubic boron nitride is lower than that of diamond, but diamond can not be used for grinding ferrous metal, so cubic boron nitride is the best grinding material for ferrous metal and its alloy at present.
 
Preparation of lithium boron nitride (Li3BN2) by preparation of lithium nitride
Recent studies have shown that a novel superhard material consisting of B, C, and N (chemically represented as BxCynz) can integrate the properties of diamond and cubic boron nitride. Moreover, the research also shows that the cubic boron nitride abrasive doped with C in the crystal shows better toughness and will have better-grinding performance.
 
Li3BN2 was prepared from boron carbide and lithium nitride in a nitrogen-fed reactor at 800 ~ 1000℃ for 1.5 ~ 2.5 hours. The specific process is as follows: lithium nitride powder and boron carbide powder are mixed in a ratio of 3.5 to 5.0molar(mole) of lithium nitride per mole of boron carbide. Among them, the particle size of boron carbide and lithium nitride powder can be in the range of 4um-200um, fine powder particles can reduce the reaction time, but the coarse particle raw materials can also synthesize Li3BN2. Put the mixed raw materials into the reaction crucible and put them in the closed reactor. Nitrogen is first passed into the reactor to eliminate the air in the reactor chamber, and then the temperature is raised to 800 ~ 1000℃ at a rate of 5℃ per minute. The temperature is kept at this temperature for 1 ~ 2 hours, and then the temperature is cooled along with the furnace. A small flow of nitrogen is maintained through the reactor throughout the reaction. After cooling to room temperature, take out the reaction crucible, the bulk product is Li3BN2, after crushing to get Li3BN2 powder.

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Tag: Li3N