Synthesis method of millimeter-sized cubic boron nitride large single crystal
A technology of cubic boron nitride and synthesis methods, applied in chemical instruments and methods, single crystal growth, single crystal growth, etc., can solve the problems of poor synthesis quality, difficult synthesis, slow growth, etc., and achieve the effect of complete crystal form
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Embodiment 1
[0015] The ternary catalyst Li 3 BN 2 Powder and Binary Catalyst Li 3 N powder, elemental metal Mg powder and refined HBN are raw materials, according to mass ratio: Li 3 BN 2 : Li 3 The ratio of N:Mg:HBN=10:8:2:100 is taken separately, mixed uniformly and pressed into a cylinder, put into a graphite heating tube to make a synthetic rod, put into the synthetic chamber of a six-sided top press, and added When the pressure reaches 35MPa, start heating. When it reaches 42MPa, the temperature reaches 1650°C and maintains for 8 minutes. Continue to increase the pressure to 80MPa. The temperature reaches 1650°C and maintains for 60 minutes. pressure. The composite was taken out, crushed, soaked in water, and subjected to conventional acid-base treatment to obtain cubic boron nitride crystals, and sieved with a sieve to obtain cubic boron nitride crystals of various particle sizes. The crystals were amber and transparent, and 16-20 meshes accounted for The proportion can reach ...
Embodiment 2
[0017] The ternary catalyst Li 3 BN 2 Powder and Binary Catalyst Li 3 N powder, elemental metal Al powder and refined HBN are used as raw materials, according to mass ratio: Li 3 BN 2 : Li 3 The ratio of N:Al:HBN=10:8:2:100 is taken separately, mixed uniformly and pressed into a cylinder, put into a graphite heating tube to make a synthetic rod, put into the synthetic chamber of a six-sided top press, and added When the pressure reaches 35MPa, start heating. When it reaches 42MPa, the temperature reaches 1600°C and maintains for 8 minutes. Continue to increase the pressure to 80MPa. The temperature reaches 1650°C and maintains for 80 minutes. pressure. The composite was taken out, crushed, soaked in water, and subjected to conventional acid-base treatment to obtain cubic boron nitride crystals, and sieved with a sieve to obtain cubic boron nitride crystals of various particle sizes. The crystals were amber and transparent, and 16-20 meshes accounted for The proportion ca...
Embodiment 3
[0019] The ternary catalyst Mg 3 B 2 N 4 Powder and Binary Catalyst Li 3 N powder, elemental metal Mg powder and refined HBN are used as raw materials, according to mass ratio: Mg 3 B 2 N 4 : Li 3 The ratio of N:Mg:HBN=12:8:2:100 is taken separately, mixed evenly and pressed into a cylinder, put into a graphite heating tube to make a synthetic rod, put into the synthetic cavity of a six-sided top press, and added When the pressure reaches 35MPa, start heating. When it reaches 42MPa, the temperature reaches 1550°C and maintains for 8 minutes. Continue to increase the pressure to 80MPa. The temperature reaches 1600°C and maintains for 90 minutes. pressure. The composite was taken out, crushed, soaked in water, and conventional acid-base treatment to obtain cubic boron nitride crystals, and sieved with a sieve to obtain cubic boron nitride crystals of various particle sizes. The crystals were yellow and translucent, and 16-20 meshes accounted for The proportion can reach ...
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