Cubic boron nitride synthetic method
A technology of cubic boron nitride and synthesis method, applied in the direction of nitrogen compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of poor thermal stability, many crystal defects, fine particle size, etc., and achieve wide pressure range and high yield , Moderate effect
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[0014] Example 1
[0015] Hexagonal boron nitride, Mg 3 N 2 , And MgAl alloy (Mg50Al50) are weighed at a mass ratio of 100:10:2, and after uniform mixing, they are pressed into a cylindrical shape, put into a tubular graphite heating element, and then put into a pyrophyllite assembly block, on the hinged six-sided top High temperature and high pressure synthesis on the press, the synthesis pressure is 5.0Gpa, the synthesis temperature is 1400℃~1600℃, and the synthesis time is 4 minutes. After the heat is stopped, the pressure is relieved, the synthetic rod is taken out, and the amber, translucent cubic boron nitride crystal is obtained by acid-base purification treatment, which is in an isometric shape, the cubic boron nitride conversion rate is 30%, and the particle size distribution is 70 / 80~325 / 400, 80 / 100 size cubic boron nitride has a crushing strength of 20 Newtons.
Example Embodiment
[0016] Example 2
[0017] Hexagonal boron nitride, Ca 3 N 2 Weigh and mix with MgAl alloy (Mg50Al50) at a mass ratio of 100:9:2, and synthesize at high temperature and high pressure according to the same method as in Example 1. The synthesis pressure is 4.2Gpa, the synthesis temperature is 1300℃~1500℃, and the synthesis time is 8 minutes. . After the heat is stopped, the pressure is relieved, the synthetic rod is taken out, and the amber, transparent cubic boron nitride crystal is obtained by acid-base purification treatment, which is in an equal area, the cubic boron nitride conversion rate is 35%, and the particle size distribution is 60 / 70~325 / The crushing strength of 400, 80 / 100 cubic boron nitride is 25 Newtons.
Example Embodiment
[0018] Example 3
[0019] Hexagonal boron nitride, Li 3 N and MgAl alloy (Mg50Al50) are weighed and mixed in a mass ratio of 100:85:2.5, and synthesized according to the same method as in Example 1 at high temperature and high pressure, the synthesis pressure is 5.8Gpa, the synthesis temperature is 1500℃~1800℃, and the synthesis time For 12 minutes. After the heat is stopped, the pressure is relieved, the synthetic rod is taken out, and the amber and transparent cubic boron nitride crystals are obtained by acid-base purification treatment, most of which are equi-shaped, a small amount are plate-shaped, the cubic boron nitride conversion rate is 39%, and the particle size distribution is 60 / 70~325 / 400, 80 / 100 particle size cubic boron nitride has a crushing strength of 28 Newtons.
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