CN103272529A - Method for synthesizing cubic boron nitride polycrystalline particles - Google Patents
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Abstract
The invention relates to a method for synthesizing cubic boron nitride polycrystalline particles, and relates to a high-temperature and high-pressure synthesis method of a superhard material. Hexagonal boron nitride as a raw material, alkali metal or alkaline earth metal elemental powder as a catalyst, and alkali metal oxide or alkaline earth metal oxide as an additive are mixed according to the weight ratio of 1:(0.1-0.3):(0.01-0.1) to synthesize a cubic boron nitride polycrystalline particle product at a high temperature and high pressure, wherein the synthetic temperature is 1000 to 1800 DEG C, the synthesis pressure is 4.0 to 6.0GPa, and the pressure and temperature holding time is 5 to 40 minutes. The isotropic cubic boron nitride polycrystalline particles can be directly prepared by the method, and the method has the characteristics of good product quality and simple method, and is importantly applied in the field of preparation of cubic boron nitride superhard material products and tools.
Description
Technical field
The present invention relates to a kind of HTHP synthetic method of superhard material, particularly a kind of method with alkali metal azide synthesizing cubic boron nitride glomerocryst particle.
Background technology
Cubic boron nitride (cBN) is that a kind of hardness is only second to adamantine superhard material, but its heat endurance is better than diamond, and it has extremely strong chemical inertness to iron family element and alloy thereof, at high temperature not with iron family element generation chemical reaction, therefore, cBN is specially adapted to process iron family element, and it is made goods such as cutter, emery wheel and hone bar and has been widely used in the iron and steel of high rigidity and the manufacture field of alloy material thereof as abrasive material.
Usually cubic boron nitride is (10GPa, 2000 under HTHP
oC) be directly transformed by hexagonal boron nitride, having under the situation of catalyst, the condition of synthesizing cubic boron nitride can be reduced significantly.The catalyst of synthesizing cubic boron nitride commonly used has alkali metal, alkaline-earth metal, and its nitride and boron nitride.
Cubic boron nitride has excellent properties such as high rigidity, high-wearing feature, high chemical inertness, but cubic boron nitride monocrystal usually in the form of sheets, and the mechanics of each crystal face and other characteristic all present anisotropy.Therefore, use further be prepared into the polycrystalline cubic boron nitride goods after the fragmentation of cubic boron nitride monocrystal particle again under HTHP usually at present, also not having directly, preparation has the method for the polycrystalline cubic boron nitride particle of isotropism feature.
Summary of the invention
The technical problem to be solved in the present invention is: a kind of method that can directly prepare the synthesizing cubic boron nitride glomerocryst particle of the polycrystalline cubic boron nitride particle with isotropism feature is provided.
The technical scheme that solves the problems of the technologies described above is: a kind of method of synthesizing cubic boron nitride glomerocryst particle, this method is to be raw material with the hexagonal boron nitride, be catalyst with alkali metal or alkaline-earth metal simple substance powder, be additive with alkali metal oxide or alkaline earth oxide, this hexagonal boron nitride raw material: alkali metal or alkaline-earth metal simple substance powder catalyst: alkali metal oxide or alkaline earth metal oxide additives are that evenly mix by HTHP synthesizing cubic boron nitride glomerocryst grain products 1:0.1～0.3:0.01～0.1 by weight ratio, 1000～1800 ℃ of synthesis temperatures, synthesis pressure 4.0～6.0GPa, 5～40 minutes heat-insulation pressure keeping time.
Further technical scheme of the present invention is: this method may further comprise the steps:
A. get the raw materials ready: being raw material with the hexagonal boron nitride, is catalyst with alkali metal or alkaline-earth metal simple substance powder, is that additive is got the raw materials ready with alkali metal oxide or alkaline earth oxide;
B. mix and pre-molding: be by weight ratio: the hexagonal boron nitride raw material: alkali metal or alkaline-earth metal simple substance powder catalyst: the ratio of alkali metal oxide or alkaline earth metal oxide additives=1:0.1～0.3:0.01～0.1 is got material respectively, is pressed into cylindric bar in advance after evenly mixing;
C. synthetic: cylindric bar is packed in the pyrophillite assembled block, the pyrophillite assembled block is contained on the press synthesizes again, synthesis temperature is 1000～1800 ℃, and synthesis pressure is 4.0～6.0GPa;
D. heat-insulation pressure keeping: heat-insulation pressure keeping 5～40 minutes stops to heat the back and waits for 1～3 minute;
E. get material, cooling: slowly be depressurized to normal pressure, take out cylindric bar, be cooled to room temperature;
F. purify: cooled cylindric bar is carried out the soda acid purification processes, make the polycrystalline cubic boron nitride particle with isotropism feature.
Further technical scheme of the present invention is: described additive is homogeneity alkali metal oxide or the alkaline earth oxide that is coated on alkali metal or alkaline-earth metal simple substance powder catalyst surface.
Further technical scheme more of the present invention is: this method may further comprise the steps:
A. get the raw materials ready: be raw material with the hexagonal boron nitride, the alkali metal or the alkaline-earth metal simple substance powder that are coated with homogeneity alkali metal oxide or alkaline earth oxide with the surface are that catalyst is got the raw materials ready;
B. mix and pre-molding: be by weight ratio: hexagonal boron nitride: alkali metal or alkaline-earth metal simple substance powder: the ratio of alkali metal oxide or alkaline earth oxide=1:0.1～0.3:0.01～0.1 is got material respectively, is pressed into cylindric bar in advance after evenly mixing;
C. synthetic: cylindric bar is packed in the pyrophillite assembled block, the pyrophillite assembled block is contained on the press synthesizes again, synthesis temperature is 1000～1800 ℃, and synthesis pressure is 4.0～6.0GPa;
D. heat-insulation pressure keeping: heat-insulation pressure keeping 5～40 minutes stops to heat the back and waits for 1～3 minute;
E. get material, cooling: slowly be depressurized to normal pressure, take out cylindric bar, be cooled to room temperature;
F. purify: cooled cylindric bar is carried out the soda acid purification processes, make the polycrystalline cubic boron nitride particle with isotropism feature.
Further technical scheme of the present invention is: the granularity of described polycrystalline cubic boron nitride particle is 0.2～1.5mm, and each polycrystalline cubic boron nitride particle is to be that micron-sized tiny cubic boron nitride monocrystal grain is polymerized by granularity.
Because adopt said structure, the method for the present invention's synthesizing cubic boron nitride glomerocryst particle compared with prior art has following beneficial effect:
1. can directly prepare the polycrystalline cubic boron nitride particle with isotropism feature:
Because the present invention is by being raw material with the hexagonal boron nitride, be in the synthetic system of catalyst with alkali (soil) metal simple-substance powder, add a certain amount of alkali (soil) metal oxide, raw material, metal solvent and additive evenly mix the back pre-molding by a certain percentage, being assembled in height is pressed in the piece, synthesizing cubic boron nitride glomerocryst particle under high-temperature and high-pressure conditions, synthesis temperature is 1000～1800 ℃, synthesis pressure is 4.0～6.0GPa, generated time is 5～40 minutes, and synthetic product can obtain having the polycrystalline cubic boron nitride particle of isotropism feature after highly basic and strong acid purified treatment.
2. good product quality:
According to the generated time difference, it is polycrystalline cubic boron nitride particle between 0.2～1.5mm that the present invention can obtain particle mean size, this glomerocryst particle is to be that micron-sized tiny cubic boron nitride crystal grain is polymerized by granularity, it is a kind of cubic boron nitride superhard material of specific type, this cubic boron nitride superhard material integrates excellent properties such as high rigidity, high-wearing feature, high temperature resistant, good toughness, and has an isotropism, its good product quality has important application in preparation cubic boron nitride superhard material product and field of tool.
3. method is simple:
Because the present invention can directly prepare the polycrystalline cubic boron nitride particle, need not further under HTHP, to be prepared into the polycrystalline cubic boron nitride goods again after the cubic boron nitride monocrystal particle fragmentation, its method is fairly simple, cost is low, has important application in preparation cubic boron nitride superhard material product and field of tool.
Below, the technical characterictic to the method for the present invention's synthesizing cubic boron nitride glomerocryst particle is further described in conjunction with the embodiments.
The specific embodiment
Embodiment one:
A kind of method of synthesizing cubic boron nitride glomerocryst particle, this method is to be raw material with hexagonal boron nitride hBN, be catalyst with metal magnesium powder Mg, be that 99.9% magnesia is additive with purity, this hexagonal boron nitride raw material: metal magnesium powder Mg catalyst: the magnesia additive is after 1:0.2:0.018 evenly mixes, through HTHP synthesizing cubic boron nitride glomerocryst grain products, 1500 ℃ of synthesis temperatures by weight ratio, synthesis pressure 5.0GPa, 10 minutes heat-insulation pressure keeping time; This method may further comprise the steps:
A. get the raw materials ready: being raw material with the hexagonal boron nitride, is catalyst with metal magnesium powder Mg, is that 99.9% magnesia is that additive is got the raw materials ready with purity;
B. mix and pre-molding: be by weight ratio: the hexagonal boron nitride raw material: metal magnesium powder Mg catalyst: the ratio of magnesia additive=1:0.2:0.018 is got material respectively, is pressed into cylindric bar in advance after evenly mixing;
C. synthetic: cylindric bar is packed in the pyrophillite assembled block, the pyrophillite assembled block is contained on the top press synthesizes again, synthesis temperature is 1500 ℃, and synthesis pressure is 5.0GPa;
D. heat-insulation pressure keeping: heat-insulation pressure keeping 10 minutes stops to heat the back and waits for 2 minutes;
E. get material, cooling: slowly be depressurized to normal pressure, take out cylindric bar, be cooled to room temperature;
F. purify: cooled cylindric bar is carried out the soda acid purification processes, make the polycrystalline cubic boron nitride particle with isotropism feature, this polycrystalline cubic boron nitride average particle size is 0.5～0.7mm, epigranular, perfectly round degree well, crystal grain is full, and this glomerocryst particle is to be that micron-sized tiny cubic boron nitride particle is polymerized by granularity.
Embodiment two:
A kind of method of synthesizing cubic boron nitride glomerocryst particle, this method is to be raw material with hexagonal boron nitride hBN, be catalyst with the metal magnesium powder, be that 99.5% magnesia is additive with purity, hexagonal boron nitride raw material: metal magnesium powder catalyst: the magnesia additive is after 1:0.1:0.01 evenly mixes, through HTHP synthesizing cubic boron nitride glomerocryst grain products, 1000 ℃ of synthesis temperatures by weight ratio, synthesis pressure 4.0GPa, 5 minutes heat-insulation pressure keeping time; This method may further comprise the steps:
A. get the raw materials ready: being raw material with the hexagonal boron nitride, is catalyst with the metal magnesium powder, is that 99.5% magnesia is that additive is got the raw materials ready with purity;
B. mix and pre-molding: be by weight ratio: the hexagonal boron nitride raw material: the metal magnesium powder catalyst: the ratio of magnesia additive=1:0.1:0.01 is got material respectively, is pressed into cylindric bar in advance after evenly mixing;
C. synthetic: cylindric bar is packed in the pyrophillite assembled block, the pyrophillite assembled block is contained on the top press synthesizes again, synthesis temperature is 1000 ℃, and synthesis pressure is 4.0Gpa;
D. heat-insulation pressure keeping: heat-insulation pressure keeping 5 minutes stops to heat the back and waits for 1 minute;
E. get material, cooling: slowly be depressurized to normal pressure, take out cylindric bar, be cooled to room temperature;
F. purify: cooled cylindric bar is carried out the soda acid purification processes, make the polycrystalline cubic boron nitride particle with isotropism feature, this polycrystalline cubic boron nitride average particle size is 0.2～0.5mm, epigranular, perfectly round degree well, crystal grain is full, and this glomerocryst particle is to be that micron-sized tiny cubic boron nitride particle is polymerized by granularity.
Embodiment three:
A kind of method of synthesizing cubic boron nitride glomerocryst particle, this method is to be raw material with hexagonal boron nitride hBN, be catalyst with the metal magnesium powder, be that 99.8% magnesia is additive with purity, this hexagonal boron nitride raw material: metal magnesium powder catalyst: the magnesia additive is after 1:0.3:0.1 evenly mixes, through HTHP synthesizing cubic boron nitride glomerocryst grain products, 1800 ℃ of synthesis temperatures by weight ratio, synthesis pressure 6.0GPa, 40 minutes heat-insulation pressure keeping time; This method may further comprise the steps:
A. get the raw materials ready: being raw material with the hexagonal boron nitride, is catalyst with the metal magnesium powder, is that 99.8% magnesia is that additive is got the raw materials ready with purity;
B. mix and pre-molding: be by weight ratio: the hexagonal boron nitride raw material: the metal magnesium powder catalyst: the ratio of magnesia additive=1:0.3:0.1 is got material respectively, is pressed into cylindric bar in advance after evenly mixing;
C. synthetic: cylindric bar is packed in the pyrophillite assembled block, the pyrophillite assembled block is contained on the top press synthesizes again, synthesis temperature is 1800 ℃, and synthesis pressure is 6.0Gpa;
D. heat-insulation pressure keeping: heat-insulation pressure keeping 40 minutes stops to heat the back and waits for 3 minutes;
E. get material, cooling: slowly be depressurized to normal pressure, take out cylindric bar, be cooled to room temperature;
F. purify: cooled cylindric bar is carried out the soda acid purification processes, make the polycrystalline cubic boron nitride particle with isotropism feature, this polycrystalline cubic boron nitride average particle size is 0.5～1.0mm, epigranular, perfectly round degree well, crystal grain is full, and this glomerocryst particle is to be that micron-sized tiny cubic boron nitride particle is polymerized by granularity.
Embodiment four:
A kind of method of synthesizing cubic boron nitride glomerocryst particle, this method is to be raw material with hexagonal boron nitride hBN, be catalyst with the metallic lithium powder, be that 99.9% lithia is additive with purity, this hexagonal boron nitride raw material: metallic lithium powder catalyst: the lithia additive is 1:0.25:0.05 by weight ratio, through HTHP synthesizing cubic boron nitride glomerocryst grain products, 1200 ℃ of synthesis temperatures, synthesis pressure 5.5GPa, 30 minutes heat-insulation pressure keeping time; This method may further comprise the steps:
A. get the raw materials ready: being raw material with the hexagonal boron nitride, is catalyst with the metallic lithium powder, is that 99.9% lithia is that additive is got the raw materials ready with purity;
B. mix and pre-molding: be by weight ratio: the hexagonal boron nitride raw material: the metallic lithium powder catalyst: the ratio of lithia additive=1:0.25:0.05 is got material respectively, is pressed into cylindric bar in advance after evenly mixing;
C. synthetic: cylindric bar is packed in the pyrophillite assembled block, the pyrophillite assembled block is contained on the top press synthesizes again, synthesis temperature is 1200 ℃, and synthesis pressure is 5.5Gpa;
D. heat-insulation pressure keeping: heat-insulation pressure keeping 30 minutes stops to heat the back and waits for 2 minutes;
E. get material, cooling: slowly be depressurized to normal pressure, take out cylindric bar, be cooled to room temperature;
F. purify: cooled cylindric bar is carried out the soda acid purification processes, make the polycrystalline cubic boron nitride particle with isotropism feature, this polycrystalline cubic boron nitride average particle size is 1.0～1.5mm, epigranular, perfectly round degree well, crystal grain is full, and this glomerocryst particle is to be that micron-sized tiny cubic boron nitride particle is polymerized by granularity.
Embodiment five:
A kind of method of synthesizing cubic boron nitride glomerocryst particle, this method is to be raw material with hexagonal boron nitride hBN, being coated with the magnesian metal magnesium powder of one deck with the surface is catalyst, hexagonal boron nitride raw material: metal magnesium powder Mg: magnesia is after 1:0.25:0.075 evenly mixes by weight ratio, through HTHP synthesizing cubic boron nitride glomerocryst grain products, 1600 ℃ of synthesis temperatures, synthesis pressure 5.0GPa, 10 minutes heat-insulation pressure keeping time; This method may further comprise the steps:
A. get the raw materials ready: be raw material with the hexagonal boron nitride, being coated with the magnesian metal magnesium powder of one deck with the surface is that catalyst is got the raw materials ready, and wherein metal magnesium powder and magnesian weight ratio are 1:0.3;
B. mix and pre-molding: be by weight ratio: the hexagonal boron nitride raw material: the ratio that is coated with magnesian metal magnesium powder=1:0.25 is got material respectively, make the hexagonal boron nitride raw material: metal magnesium powder Mg: magnesia is 1:0.25:0.075 by weight ratio, is pressed into cylindric bar in advance after evenly mixing;
C. synthetic: cylindric bar is packed in the pyrophillite assembled block, the pyrophillite assembled block is contained on the top press synthesizes again, synthesis temperature is 1600 ℃, and synthesis pressure is 5.0Gpa;
D. heat-insulation pressure keeping: heat-insulation pressure keeping 10 minutes stops to heat the back and waits for 2 minutes;
E. get material, cooling: slowly be depressurized to normal pressure, take out cylindric bar, be cooled to room temperature;
F. purify: cooled cylindric bar is carried out the soda acid purification processes, make the polycrystalline cubic boron nitride particle with isotropism feature, this polycrystalline cubic boron nitride average particle size is 0.6～0.8mm, epigranular, perfectly round degree well, crystal grain is full, and this glomerocryst particle is to be that micron-sized tiny cubic boron nitride particle is polymerized by granularity.
Embodiment six:
A kind of method of synthesizing cubic boron nitride glomerocryst particle, this method is to be raw material with hexagonal boron nitride hBN, being coated with the magnesian metal magnesium powder of one deck with the surface is catalyst, this hexagonal boron nitride raw material: metal magnesium powder: magnesia is after 1:0.1:0.01 evenly mixes by weight ratio, through HTHP synthesizing cubic boron nitride glomerocryst grain products, 1000 ℃ of synthesis temperatures, synthesis pressure 4.0GPa, 5 minutes heat-insulation pressure keeping time; This method may further comprise the steps:
A. get the raw materials ready: be raw material with the hexagonal boron nitride, being coated with the magnesian metal magnesium powder of one deck with the surface is that catalyst is got the raw materials ready, and wherein metal magnesium powder and magnesian weight ratio are 1:0.1;
B. mix and pre-molding: be by weight ratio: the hexagonal boron nitride raw material: the ratio that is coated with magnesian metal magnesium powder=1:0.1 is got material respectively, make the hexagonal boron nitride raw material: metal magnesium powder: magnesia is 1:0.1:0.01 by weight ratio, is pressed into cylindric bar in advance after evenly mixing;
C. synthetic: cylindric bar is packed in the pyrophillite assembled block, the pyrophillite assembled block is contained on the top press synthesizes again, synthesis temperature is 1000 ℃, and synthesis pressure is 4.0Gpa;
D. heat-insulation pressure keeping: heat-insulation pressure keeping 5 minutes stops to heat the back and waits for 1 minute;
E. get material, cooling: slowly be depressurized to normal pressure, take out cylindric bar, be cooled to room temperature;
F. purify: cooled cylindric bar is carried out the soda acid purification processes, make the polycrystalline cubic boron nitride particle with isotropism feature, this polycrystalline cubic boron nitride average particle size is 0.2～0.5mm, epigranular, perfectly round degree well, crystal grain is full, and this glomerocryst particle is to be that micron-sized tiny cubic boron nitride particle is polymerized by granularity.
Embodiment seven:
A kind of method of synthesizing cubic boron nitride glomerocryst particle, this method is to be raw material with hexagonal boron nitride hBN, being coated with the magnesian metal magnesium powder of one deck with the surface is catalyst, this hexagonal boron nitride raw material: metal magnesium powder: magnesia is after 1:0.3:0.1 evenly mixes by weight ratio, through HTHP synthesizing cubic boron nitride glomerocryst grain products, 1800 ℃ of synthesis temperatures, synthesis pressure 6.0GPa, 40 minutes heat-insulation pressure keeping time; This method may further comprise the steps:
A. get the raw materials ready: be raw material with the hexagonal boron nitride, being coated with the magnesian metal magnesium powder of one deck with the surface is catalyst, gets the raw materials ready, and wherein metal magnesium powder and magnesian weight ratio are 1:0.333;
B. mix and pre-molding: be by weight ratio: the hexagonal boron nitride raw material: the ratio that is coated with magnesian metal magnesium powder=1:0.3 is got material respectively, make the hexagonal boron nitride raw material: metal magnesium powder: magnesia is 1:0.3:0.1 by weight ratio, is pressed into cylindric bar in advance after evenly mixing;
C. synthetic: cylindric bar is packed in the pyrophillite assembled block, the pyrophillite assembled block is contained on the top press synthesizes again, synthesis temperature is 1800 ℃, and synthesis pressure is 6.0Gpa;
D. heat-insulation pressure keeping: heat-insulation pressure keeping 40 minutes stops to heat the back and waits for 3 minutes;
E. get material, cooling: slowly be depressurized to normal pressure, take out cylindric bar, be cooled to room temperature;
F. purify: cooled cylindric bar is carried out the soda acid purification processes, make the polycrystalline cubic boron nitride particle with isotropism feature, this polycrystalline cubic boron nitride average particle size is 1.3～1.5mm, epigranular, perfectly round degree well, crystal grain is full, and this glomerocryst particle is to be that micron-sized tiny cubic boron nitride particle is polymerized by granularity.
Embodiment eight:
A kind of method of synthesizing cubic boron nitride glomerocryst particle, this method is to be raw material with hexagonal boron nitride hBN, the metallic lithium powder that is coated with one deck lithia with the surface is catalyst, this hexagonal boron nitride raw material: metallic lithium powder: lithia is after 1:0.25:0.05 evenly mixes by weight ratio, through HTHP synthesizing cubic boron nitride glomerocryst grain products, 1200 ℃ of synthesis temperatures, synthesis pressure 5.5GPa, 30 minutes heat-insulation pressure keeping time; This method may further comprise the steps:
A. get the raw materials ready: be raw material with the hexagonal boron nitride, the metallic lithium powder that is coated with one deck lithia with the surface is catalyst, gets the raw materials ready, and wherein the weight ratio of metallic lithium powder and lithia is 1:0.2;
B. mix and pre-molding: be by weight ratio: the hexagonal boron nitride raw material: the ratio that is coated with the metallic lithium powder=1:0.25 of lithia is got material respectively, make the hexagonal boron nitride raw material: metallic lithium powder: lithia is 1:0.25:0.05 by weight ratio, is pressed into cylindric bar in advance after evenly mixing;
C. synthetic: cylindric bar is packed in the pyrophillite assembled block, the pyrophillite assembled block is contained on the top press synthesizes again, synthesis temperature is 1200 ℃, and synthesis pressure is 5.5Gpa;
D. heat-insulation pressure keeping: heat-insulation pressure keeping 30 minutes stops to heat the back and waits for 2 minutes;
E. get material, cooling: slowly be depressurized to normal pressure, take out cylindric bar, be cooled to room temperature;
F. purify: cooled cylindric bar is carried out the soda acid purification processes, make the polycrystalline cubic boron nitride particle with isotropism feature, this polycrystalline cubic boron nitride average particle size is 1.0～1.2mm, epigranular, perfectly round degree well, crystal grain is full, and this glomerocryst particle is to be that micron-sized tiny cubic boron nitride particle is polymerized by granularity.
Claims (5)
1. the method for a synthesizing cubic boron nitride glomerocryst particle, it is characterized in that: this method is to be raw material with the hexagonal boron nitride, be catalyst with alkali metal or alkaline-earth metal simple substance powder, be additive with alkali metal oxide or alkaline earth oxide, this hexagonal boron nitride raw material: alkali metal or alkaline-earth metal simple substance powder catalyst: alkali metal oxide or alkaline earth metal oxide additives are that evenly mix by HTHP synthesizing cubic boron nitride glomerocryst grain products 1:0.1～0.3:0.01～0.1 by weight ratio, 1000～1800 ℃ of synthesis temperatures, synthesis pressure 4.0～6.0GPa, 5～40 minutes heat-insulation pressure keeping time.
2. the method for synthesizing cubic boron nitride glomerocryst particle according to claim 1, it is characterized in that: this method may further comprise the steps:
A. get the raw materials ready: being raw material with the hexagonal boron nitride, is catalyst with alkali metal or alkaline-earth metal simple substance powder, is that additive is got the raw materials ready with alkali metal oxide or alkaline earth oxide;
B. mix and pre-molding: be by weight ratio: the hexagonal boron nitride raw material: alkali metal or alkaline-earth metal simple substance powder catalyst: the ratio of alkali metal oxide or alkaline earth metal oxide additives=1:0.1～0.3:0.01～0.1 is got material respectively, is pressed into cylindric bar in advance after evenly mixing;
C. synthetic: cylindric bar is packed in the pyrophillite assembled block, the pyrophillite assembled block is contained on the press synthesizes again, synthesis temperature is 1000～1800 ℃, and synthesis pressure is 4.0～6.0GPa;
D. heat-insulation pressure keeping: heat-insulation pressure keeping 5～40 minutes stops to heat the back and waits for 1～3 minute;
E. get material, cooling: slowly be depressurized to normal pressure, take out cylindric bar, be cooled to room temperature;
F. purify: cooled cylindric bar is carried out the soda acid purification processes, make the polycrystalline cubic boron nitride particle with isotropism feature.
3. the method for synthesizing cubic boron nitride glomerocryst particle according to claim 1, it is characterized in that: described additive is homogeneity alkali metal oxide or the alkaline earth oxide that is coated on alkali metal or alkaline-earth metal simple substance powder catalyst surface.
4. the method for synthesizing cubic boron nitride glomerocryst particle according to claim 3, it is characterized in that: this method may further comprise the steps:
A. get the raw materials ready: be raw material with the hexagonal boron nitride, the alkali metal or the alkaline-earth metal simple substance powder that are coated with homogeneity alkali metal oxide or alkaline earth oxide with the surface are that catalyst is got the raw materials ready;
B. mix and pre-molding: be by weight ratio: hexagonal boron nitride: alkali metal or alkaline-earth metal simple substance powder: the ratio of alkali metal oxide or alkaline earth oxide=1:0.1～0.3:0.01～0.1 is got material respectively, is pressed into cylindric bar in advance after evenly mixing;
C. synthetic: cylindric bar is packed in the pyrophillite assembled block, the pyrophillite assembled block is contained on the press synthesizes again, synthesis temperature is 1000～1800 ℃, and synthesis pressure is 4.0～6.0GPa;
D. heat-insulation pressure keeping: heat-insulation pressure keeping 5～40 minutes stops to heat the back and waits for 1～3 minute;
E. get material, cooling: slowly be depressurized to normal pressure, take out cylindric bar, be cooled to room temperature;
F. purify: cooled cylindric bar is carried out the soda acid purification processes, make the polycrystalline cubic boron nitride particle with isotropism feature.
5. according to the method for claim 1 or 2 or 3 or 4 described synthesizing cubic boron nitride glomerocryst particles, it is characterized in that: the granularity of described polycrystalline cubic boron nitride particle is 0.2～1.5mm, and each polycrystalline cubic boron nitride particle is to be that micron-sized tiny cubic boron nitride monocrystal grain is polymerized by granularity.
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| CN103526295A (en) * | 2013-10-15 | 2014-01-22 | 寇自力 | High-purity high-hardness polycrystalline cubic boron nitride block material and preparation method thereof |
| CN103691363A (en) * | 2013-12-10 | 2014-04-02 | 太原理工大学 | Synthesis method of cubic boron nitride polycrystalline particles |
| CN104607110A (en) * | 2015-01-30 | 2015-05-13 | 富耐克超硬材料股份有限公司 | Manufacturing method for cubic boron nitride crystal |
| CN109455680A (en) * | 2019-01-07 | 2019-03-12 | 郑州中南杰特超硬材料有限公司 | A kind of cubic boron nitride surface roughening treatment method |
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| CN1744943A (en) * | 2003-02-03 | 2006-03-08 | 昭和电工株式会社 | Cubic boron nitride, catalyst for synthesizing cubic boron nitride, and process for producing cubic boron nitride |
| GB2489588A (en) * | 2011-03-30 | 2012-10-03 | Element Six Ltd | Cubic boron nitride crystal |
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| CN103526295A (en) * | 2013-10-15 | 2014-01-22 | 寇自力 | High-purity high-hardness polycrystalline cubic boron nitride block material and preparation method thereof |
| CN103691363A (en) * | 2013-12-10 | 2014-04-02 | 太原理工大学 | Synthesis method of cubic boron nitride polycrystalline particles |
| CN104607110A (en) * | 2015-01-30 | 2015-05-13 | 富耐克超硬材料股份有限公司 | Manufacturing method for cubic boron nitride crystal |
| CN104607110B (en) * | 2015-01-30 | 2017-01-18 | 富耐克超硬材料股份有限公司 | Manufacturing method for cubic boron nitride crystal |
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