CN112973577A - Synthesis method of cubic boron nitride - Google Patents
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- CN112973577A CN112973577A CN202110270726.7A CN202110270726A CN112973577A CN 112973577 A CN112973577 A CN 112973577A CN 202110270726 A CN202110270726 A CN 202110270726A CN 112973577 A CN112973577 A CN 112973577A
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- 229910052582 BN Inorganic materials 0.000 title claims abstract description 27
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 238000001308 synthesis method Methods 0.000 title description 2
- 239000003054 catalyst Substances 0.000 claims abstract description 33
- 239000013078 crystal Substances 0.000 claims abstract description 32
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 30
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 30
- 229910012375 magnesium hydride Inorganic materials 0.000 claims abstract description 29
- 238000002156 mixing Methods 0.000 claims abstract description 21
- 239000012448 Lithium borohydride Substances 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 19
- 239000002131 composite material Substances 0.000 claims abstract description 16
- 230000002194 synthesizing effect Effects 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 229910052903 pyrophyllite Inorganic materials 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 13
- IDBFBDSKYCUNPW-UHFFFAOYSA-N lithium nitride Chemical compound [Li]N([Li])[Li] IDBFBDSKYCUNPW-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 238000003825 pressing Methods 0.000 claims abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 7
- 239000010439 graphite Substances 0.000 claims abstract description 7
- 238000011049 filling Methods 0.000 claims abstract description 6
- 238000000746 purification Methods 0.000 claims abstract description 3
- 239000002245 particle Substances 0.000 claims description 24
- 238000004321 preservation Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 8
- 239000001257 hydrogen Substances 0.000 description 8
- 229910052739 hydrogen Inorganic materials 0.000 description 8
- 239000002253 acid Substances 0.000 description 4
- 239000003513 alkali Substances 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 150000004767 nitrides Chemical class 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- 150000001342 alkaline earth metals Chemical class 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 229910010084 LiAlH4 Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000012280 lithium aluminium hydride Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/06—Processes using ultra-high pressure, e.g. for the formation of diamonds; Apparatus therefor, e.g. moulds or dies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/0005—Catalytic processes under superatmospheric pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2203/00—Processes utilising sub- or super atmospheric pressure
- B01J2203/06—High pressure synthesis
- B01J2203/0605—Composition of the material to be processed
- B01J2203/0645—Boronitrides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2203/00—Processes utilising sub- or super atmospheric pressure
- B01J2203/06—High pressure synthesis
- B01J2203/065—Composition of the material produced
- B01J2203/066—Boronitrides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2203/00—Processes utilising sub- or super atmospheric pressure
- B01J2203/06—High pressure synthesis
- B01J2203/0675—Structural or physico-chemical features of the materials processed
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Abstract
The invention discloses a method for synthesizing cubic boron nitride, which comprises the following steps: (1) selecting hBN as raw material and Li3N、LiBH4、MgH2As a composite catalyst, and the hBN and the composite catalyst are mixed according to the hBN: Li3N:（LiBH4+MgH2) Taking materials respectively in a mass ratio of (2-8): 3-15 of =100, and taking LiBH4And MgH2The mass ratio is (2-3) to 1, and the raw materials and the composite catalyst are fully mixed for 5-10 hours; (2) after mixing, pressing the mixture on a hydraulic press into a cylinder shape, filling the cylinder shape into a graphite heating body, and then filling the cylinder shape into a pyrophyllite assembly block; (3) putting the assembled pyrophyllite block into a high-pressure cavity of a cubic press for synthesis, wherein the synthesis pressure is 4.0-6.5 GPa, the temperature is 1200-1800 ℃, and the temperature is kept for 5-15 min; (4) after the synthesis is finished, the cBN single crystal is obtained through acid-base purification treatment.
Description
Technical Field
The invention belongs to the technical field of superhard material synthesis, and particularly relates to a method for synthesizing cubic boron nitride.
Background
Cubic boron nitride (cBN) has second-order high hardness to diamond and better thermal stability and chemical inertness than diamond, is used as super abrasive to make various grinding wheels and cutters, is used for processing ferrous metal materials, has the advantages of high efficiency, precision, energy conservation, automation and the like, and is widely applied to the field of modern processing, particularly high-precision processing.
For industrial large-scale synthesis of cBN, an ultrahigh pressure and high temperature catalyst method is mainly adopted at the present stage, namely hexagonal boron nitride (hBN) is taken as a raw material under the ultrahigh pressure and high temperature synthesis condition, and the hBN is converted into the cBN under the action of a catalyst.
In the synthesis process of cBN, the type and quality of the catalyst material can have important influence on the conversion rate, crystal form, impact strength and particle size distribution of the CBN. At present, the commonly used catalyst materials mainly comprise alkali metals, alkaline earth metals and nitrides, borides and boronitrides thereof, and the catalyst materials have active properties and are easy to react with oxygen and water vapor in the air to cause performance deterioration and influence the conversion rate and quality of cBN. Chinese patent CN2004800033086 "cubic boron nitride, cubic boron nitride synthesis catalyst and method for producing cubic boron nitride", in order to reduce oxidation of the catalyst, organic matter is added to the catalyst to cover the surface of the catalyst particles and isolate contact with oxygen or water, but this is liable to introduce other residual impurities. Although the Chinese patents CN100496696C, CN101323438B and CN100391586C adopt the mixture of alloy, alkali metal, alkaline earth metal nitrogen and fluoride as the catalyst, the stability of the catalyst is improved, the synthesis pressure temperature range is wide, but the conversion rate is lower, only 30-50%, and the fluctuation of the synthesis conversion rate is large.
Since the catalyst has a crucial influence on the synthesis of cBN, there is an urgent need to find new catalyst materials to improve the stability of the catalyst and the quality and conversion rate of the synthesized cBN.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a method for synthesizing cubic boron nitride. The invention mixes binary nitride Li by specific proportion3N and LiBH4+MgH2The mixture of (A) is a novel composite catalyst, refined high-purity hBN is used as a raw material, and synthesis of CBN is carried out by the high-temperature high-pressure synthesis process curve of the invention.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a method for synthesizing cubic boron nitride comprises the following steps:
(1) selecting refined high-purity hBN with the granularity of less than or equal to 100 meshes and the purity of more than or equal to 96 percent as a raw material, and selecting Li with the granularity of less than or equal to 100 meshes3N、LiBH4、MgH2As a composite catalyst, and mixing the hBN and the composite catalyst according to the molar ratio of hBN: li3N:（LiBH4+ MgH2) Taking materials respectively in a mass ratio of (2-8): (3-20) =100, and taking LiBH4And MgH2The molar ratio is (2-3): 1, and the raw materials and the composite catalyst are fully mixed for 5-10 hours on a three-dimensional mixer;
(2) after mixing, pressing the mixture on a hydraulic press into a cylinder shape, filling the cylinder shape into a graphite heating body, and then filling the cylinder shape into a pyrophyllite assembly block;
(3) putting the assembled pyrophyllite block into a high-pressure cavity of a cubic press for synthesis, wherein the synthesis pressure is 4.0-6.5 GPa, the temperature is 1200-1800 ℃, and the heat preservation time is 5-15 min as shown in figure 5;
(4) after the synthesis is finished, the acid and alkali are purified to obtain the cBN single crystal, the color of the cBN single crystal is light brown to black, most of the cBN single crystal are in an equal volume type, the granularity of the cBN single crystal is screened to be 40/50-325/400, and the impact toughness Ti determination is carried out on the peak granularity.
Preferably, the mass ratio of the hBN to the composite catalyst is hBN to Li3N:（LiBH4+ MgH2）=100:(2~7):(9~20)。
Preferably, LiBH4And MgH2The molar (amount of substance) ratio of (c) is 2: 1.
According to the inventionThe beneficial effects are as follows: LiBH4And MgH2According to the mass ratio of 2:1, a novel hydrogen storage system (Li-Mg-B-H) with high hydrogen capacity (theoretical value is up to 11.8%) and relatively moderate thermodynamic stability can be formed; in the article "Complex Hydrogen storage Compounds LiAlH4And the research on the hydrogen release performance of the complex system, the research on the hydrogen storage performance and mechanism of the magnesium-aluminum-based alloy with high magnesium content and the like mention the hydrogen storage and release principle, and release hydrogen elements in the process, and the hydrogen elements can absorb a large amount of oxygen in the cavity in the synthesis process, thereby effectively increasing the catalyst activity; lithium nitride (Li)3N) is a known cBN synthesis catalyst material having more stable performance. The binary nitride Li mixed by the specific ratio of the invention3N and LiBH4+MgH2The mixture of (A) is a novel catalyst, refined high-purity hBN is used as a raw material, and synthesis of CBN is carried out by the high-temperature high-pressure synthesis process curve of the invention. Has the advantages of low synthesis pressure and temperature condition, stable synthesis effect, excellent synthesized cBN quality, high conversion rate and the like, and is suitable for industrial production.
Drawings
FIG. 1 is a photograph (100X) of 80/100 grit cubic boron nitride obtained in example 1;
FIG. 2 is a photograph (100X) of 100/120 grit cubic boron nitride produced in example 2;
FIG. 3 is a photograph (200X) of 120/140 grit cubic boron nitride produced in example 3;
FIG. 4 is a photograph (200X) of 140/170 grit cubic boron nitride produced in example 4;
FIG. 5 is a graph of the synthesis process of the present invention.
Detailed Description
The technical solutions of the present invention are described below with specific examples, but the scope of the present invention is not limited thereto.
Example 1
A method for synthesizing cubic boron nitride comprises the following steps:
in the embodiment, refined high-purity hBN with the granularity of less than or equal to 100 meshes and the purity of more than or equal to 96 percent is selected as a raw material, and Li with the granularity of less than or equal to 100 meshes is selected3N、LiBH4、MgH2As a novel composite catalyst material, wherein LiBH is added4With MgH2Uniformly mixing the components in a mass ratio of 2:1, and then mixing the components in a mass ratio of hBN: (LiBH)4+MgH2）：Li3N =100:9:5, fully mixing for 5h on a three-dimensional mixer at the rotating speed of 24 r/min; after mixing, pressing the mixture on a hydraulic press, increasing the pressure to 15MPa, maintaining the pressure for 1s, relieving the pressure, repeating the steps for 3 times, pressing the mixture into a cylinder with the diameter of 35mm and the height of 13mm, and forming the cylinder with the forming density of 1.82g/cm3Then the graphite heating body is put into a pyrophyllite assembly block; putting the assembled pyrophyllite block into a cubic press, and heating and synthesizing for 12min under the conditions of 5.5GPa and 1600 ℃; after the synthesis is finished, the cBN single crystal is obtained through acid-base purification treatment, the color of the cBN single crystal is amber, the conversion rate of the cBN single crystal is 55 percent, most of the crystals are of equal volume type, and the mass ratio of the crystals is 81 percent; the particle size range is 40/50-325/400, the peak particle size is 80/100 and 100/120 which respectively account for 29 percent and 26 percent of the whole particle size; 80/100 and 100/120 peak particle size impact toughness Ti values are 56 and 57 respectively, wherein, the picture of the prepared 80/100 particle size cubic boron nitride with magnification of 100 times is shown in figure 1, the crystal is amber, transparent and complete in crystal form.
Example 2
A method for synthesizing cubic boron nitride comprises the following steps:
in the embodiment, refined high-purity hBN with the granularity of less than or equal to 100 meshes and the purity of more than or equal to 96 percent is selected as a raw material, and Li with the granularity of less than or equal to 100 meshes is selected3N、LiBH4、MgH2As a novel composite catalyst material, wherein LiBH is added4With MgH2Uniformly mixing the materials according to the mass ratio of 2:1, and then mixing the materials according to the mass ratio of hBN: (LiBH)4+MgH2）：Li3N =100:12:7, fully mixing for 9h on a three-dimensional mixer at the rotating speed of 24 r/min; after mixing, pressing the mixture on a hydraulic press, increasing the pressure to 15MPa, maintaining the pressure for 1s, relieving the pressure, repeating the steps for 3 times, pressing the mixture into a cylinder with the diameter of 35mm and the height of 13mm, and the forming density of 1.75g/cm3Then the graphite heating body is put into a pyrophyllite assembly block; leaves to be assembledPutting the wax stone into a cubic apparatus press, and heating and synthesizing for 10min under the conditions of 4.5GPa and 1500 ℃; after the synthesis is finished, the acid and alkali are purified to obtain cBN single crystal, the color of the cBN single crystal is black, the conversion rate of the cBN single crystal is 56 percent, most of the cBN single crystal are of equal volume type, and the cBN single crystal accounts for 79 percent (mass ratio); the particle size range is 40/50-325/400, the peak particle sizes are 100/120 and 120/140 which respectively account for 30 percent and 26 percent of the mass of the whole particle size; 100/120 and 120/140 peak particle size impact toughness Ti values are 59 and 61 respectively, wherein, the obtained photograph of the 100/120 particle size cubic boron nitride with 100 times magnification is shown in figure 2, the color is black, and the crystal form is relatively complete.
Example 3
A method for synthesizing cubic boron nitride comprises the following steps:
in the embodiment, refined high-purity hBN with the granularity of less than or equal to 100 meshes and the purity of more than or equal to 96 percent is selected as a raw material, and Li with the granularity of less than or equal to 100 meshes is selected3N、LiBH4、MgH2As a novel composite catalyst material, wherein LiBH is added4With MgH2Uniformly mixing the components in a mass ratio of 2:1, and then mixing the components in a mass ratio of hBN: (LiBH)4+MgH2）：Li3N =100:15:2, fully mixing for 10h on a three-dimensional mixer at the rotating speed of 20 r/min; after mixing, pressing the mixture on a hydraulic press, increasing the pressure to 15MPa, maintaining the pressure for 1s, relieving the pressure, repeating the steps for 3 times, pressing the mixture into a cylinder with the diameter of 35mm and the height of 13mm, and the forming density of 1.78g/cm3Then the graphite heating body is put into a pyrophyllite assembly block; putting the assembled pyrophyllite block into a cubic press, and heating and synthesizing for 15min under the conditions of pressure of 5GPa and temperature of 1550 ℃; after the synthesis is finished, the acid and alkali are purified to obtain cBN single crystal, the color of the cBN single crystal is dark brown, the conversion rate of the cBN single crystal is 58 percent, most of the cBN single crystal are of equal volume type, and the cBN single crystal accounts for 84 percent (mass ratio); the particle size range is 40/50-325/400, the peak particle sizes are 120/140 and 140/170 which respectively account for 27 percent and 24 percent of the mass of the whole particle size; 120/140 and 140/170 peak particle size impact toughness Ti values are 57 and 60 respectively, wherein, the picture of the prepared 120/140 particle size cubic boron nitride with magnification of 200 times is shown in figure 3, the color is dark brown, transparent and the crystal form is complete.
Example 4
A method for synthesizing cubic boron nitride comprises the following steps:
in the embodiment, refined high-purity hBN with the granularity of less than or equal to 100 meshes and the purity of more than or equal to 96 percent is selected as a raw material, and Li with the granularity of less than or equal to 100 meshes is selected3N、LiBH4、MgH2As a novel composite catalyst material, wherein LiBH is added4With MgH2Uniformly mixing the components in a mass ratio of 2:1, and then mixing the components in a mass ratio of hBN: (LiBH)4+MgH2）：Li3N =100:20:3, fully mixing for 10h on a three-dimensional mixer at the rotating speed of 20 r/min; after mixing, pressing the mixture on a hydraulic press, increasing the pressure to 15MPa, maintaining the pressure for 1s, relieving the pressure, repeating the steps for 3 times, pressing the mixture into a cylinder with the diameter of 35mm and the height of 13mm, and the forming density of 1.74g/cm3Then the graphite heating body is put into a pyrophyllite assembly block; putting the assembled pyrophyllite block into a cubic press, and heating and synthesizing for 10min under the conditions of pressure of 5GPa and temperature of 1550 ℃; after the synthesis is finished, the acid and alkali are purified to obtain the cBN single crystal, the color of the cBN single crystal is dark brown, the conversion rate of the cBN single crystal is 58 percent, most of the cBN single crystal are of an equal volume type, and the cBN single crystal accounts for 81 percent (mass ratio); the particle size range is 40/50-325/400, the peak particle size is 140/170 and 170/230, and the peak particle size accounts for 34% and 29% of the whole particle size by mass; 140/170 and 170/230 peak particle size impact toughness Ti values are 57 and 61 respectively, wherein, the picture of the prepared 140/170 particle size cubic boron nitride with magnification of 200 times is shown in figure 4, the color is dark brown, transparent and the crystal form is complete.
While the present invention has been described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. A method for synthesizing cubic boron nitride is characterized by comprising the following steps:
(1) selecting hBN as raw material and Li3N、LiBH4、MgH2As a composite catalyst, and the hBN and the composite catalyst are mixed according to the hBN: Li3N:（LiBH4+ MgH2) Taking materials respectively in a mass ratio of (2-8): (3-20) =100, and taking LiBH4And MgH2Mixing the raw materials and the composite catalyst for 5-10 hours, wherein the molar ratio is (2-3): 1;
(2) after mixing, pressing the mixture on a hydraulic press into a cylinder shape, filling the cylinder shape into a graphite heating body, and then filling the cylinder shape into a pyrophyllite assembly block;
(3) putting the assembled pyrophyllite block into a high-pressure cavity of a cubic press for synthesis, wherein the synthesis pressure is 4.0-6.5 GPa, the temperature is 1200-1800 ℃, and the heat preservation time is 5-15 min;
(4) after the synthesis is finished, the cBN single crystal is obtained through acid-base purification treatment.
2. The method for synthesizing cubic boron nitride according to claim 1, wherein hBN has a particle size of 100 mesh or less and a purity of 96% or more, and Li3N、LiBH4、MgH2The granularity is less than or equal to 100 meshes.
3. A method for synthesizing cubic boron nitride according to claim 1, wherein the mass ratio of hBN to the composite catalyst is hBN to Li3N:（LiBH4+ MgH2）=100:(2~7):(9~20)。
4. The method of synthesizing cubic boron nitride as recited in claim 3 in which the LiBH is present4And MgH2In a molar ratio of 2: 1.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993008139A1 (en) * | 1991-10-18 | 1993-04-29 | Centre National De La Recherche Scientifique (Cnrs) | Cubic boron nitride crystal particulate compositions with improved surface properties and process for their preparation |
| CN110670136A (en) * | 2019-09-02 | 2020-01-10 | 郑州中南杰特超硬材料有限公司 | Synthesis method of cubic boron nitride |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993008139A1 (en) * | 1991-10-18 | 1993-04-29 | Centre National De La Recherche Scientifique (Cnrs) | Cubic boron nitride crystal particulate compositions with improved surface properties and process for their preparation |
| CN110670136A (en) * | 2019-09-02 | 2020-01-10 | 郑州中南杰特超硬材料有限公司 | Synthesis method of cubic boron nitride |
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