Patent
US 8,679,429HEXAGONAL BORON NITRIDE POWDER AND METHOD FOR PRODUCING SAME
Taisei GOHARA
US
Copyright © 2026 Matter42. All rights reserved.
Patent
Atlas literature
Patent
US 8,679,429Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG. 1. The method also includes a depressurization step either during nitridization of B₄C or after the decarbonization step performed after nitridization. …
FIG. 2A. Whenever Fe is removed during nitridization, for example, it is preferable that Fe be removed by evaporation (by subjecting B₄C to depressurization …
FIGS. 3-5 are microscope photographs of BN particles after the aforementioned 15 treatment.
FIG. 4 is another microscope photograph of BN particles after decarbonization.
FIG. 5 also shows Fe as white spheres and also in a form originating from the pulverizing device (hammer). Note that the Fe granules are generally dispersed …
FIG. 6. The yield of each of sample products thus obtained by baking was 176.6 g. [0043] A portion (69.3 g) of each sample product produced by baking was …
FIG. 7 is a graph showing relationships between void ratio, bulk density, and strength of h-BN powder.
FIG. 8 is a graph showing the relationship between void ratio and thermal conductivity. Preferred Embodiments [0021] The present invention will be described in …
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A hexagonal boron nitride powder, characterized in that: primary particles of the powder exhibit a ratio (D/d) of long diameter (D) to thickness (d) in a range of 5 to 10; agglomerated particle bodies made of the primary particles have an average particle diameter (Dso) in a range of 2 p m to 200 p m, inclusive; and the powder has a bulk density in a range of 0.5 g/cm3 to 1.0 g/cm3 and impurity Fe at a concentration not greater than 500 ppm, the impurity Fe being as spherical particles having respective diameters not greater than 50 pm.
The hexagonal boron nitride powder of claim 1, wherein the average particle diameter (D so) and void ratio of the agglomerated particle body are in a range of 20 pm to 80 m, inclusive, and not greater than 50%, respectively. original
The hexagonal boron nitride powder of claim 1, wherein the agglomerated particle body is produced by baking. original
The hexagonal boron nitride powder of claim 1, produced by a method comprising the steps of: nitridizing boron carbide in a nitrogen atmosphere having a nitrogen partial pressure of at least 5 kPa and a temperature of 1800 ° C to 2200 ° C, thereby forming a nitridization product; to the nitridization product, adding B₂₀₃ and/or a precursor thereof, thereby forming a mixture; decarbonizing the mixture in a non-oxidizing atmosphere at a temperature of 1500 ° C to 2200 ° C, thereby forming a decarbonization product; and Page 4 of 7 P1o 03598 -PC LUS/IIMi Attorney Reference Number 4082-88983-0 1 App li cation Number 13/440,859 pulverizing and classifying the decarbonization product according to particle size, thereby producing hexagonal boron nitride powder; wherein, during nitridization or after decarbonization, depressurization is performed at a pressure less than 100 kPa. Page 5 of 7
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A method for producing hexagonal boron nitride powder, compris ing: subjecting boron carbide to a nitridization treatment in a nitrogen atmosphere having a nitrogen partial pressure of at least 5 kPa at temperature in a range of 1800 ° C to 2200 *C, inclusive, to produce a nitridization product; adding B₂₀₃ and/or a precursor thereof to the nitridization product to produce a mixture; decarbonizing the mixture in a non-oxidizing atmosphere at a temperature in a range of 1500 ° C to 2200 ° C, inclusive, to produce a decarbonization product; and subjecting the decarbonization product to pulverization and particle-size classification, to obtain hexagonal boron nitride powder, wherein a depressurizing step, performed at an internal pressure at 100 kPa or less, is conducted either during nitridization or after decarbonization. withdrawn
The method of claim 15, wherein the depressurizing step is performed at 80 kPa or less. withdrawn
Materials described outside the worked examples.
hexagonal boron nitride
h-BN
boron carbide
B₄C
Additional fabrication and treatment steps described in the patent.
Measurements and analyses referenced in the patent, with their drawing references.
FIG. 7 is a graph showing relationships between void ratio, bulk density, and strength of h-BN powder.
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
primary particle long diameter to thickness ratio (D/d) | 5–10 | h-BN |
agglomerated particle body average particle diameter (D50) | 2–200 |
Related documents with shared materials, methods, properties, or citations.
Patent
Atlas literature
Patent
US 8,679,429Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG. 1. The method also includes a depressurization step either during nitridization of B₄C or after the decarbonization step performed after nitridization. …
FIG. 2A. Whenever Fe is removed during nitridization, for example, it is preferable that Fe be removed by evaporation (by subjecting B₄C to depressurization …
FIGS. 3-5 are microscope photographs of BN particles after the aforementioned 15 treatment.
FIG. 4 is another microscope photograph of BN particles after decarbonization.
FIG. 5 also shows Fe as white spheres and also in a form originating from the pulverizing device (hammer). Note that the Fe granules are generally dispersed …
FIG. 6. The yield of each of sample products thus obtained by baking was 176.6 g. [0043] A portion (69.3 g) of each sample product produced by baking was …
FIG. 7 is a graph showing relationships between void ratio, bulk density, and strength of h-BN powder.
FIG. 8 is a graph showing the relationship between void ratio and thermal conductivity. Preferred Embodiments [0021] The present invention will be described in …
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A hexagonal boron nitride powder, characterized in that: primary particles of the powder exhibit a ratio (D/d) of long diameter (D) to thickness (d) in a range of 5 to 10; agglomerated particle bodies made of the primary particles have an average particle diameter (Dso) in a range of 2 p m to 200 p m, inclusive; and the powder has a bulk density in a range of 0.5 g/cm3 to 1.0 g/cm3 and impurity Fe at a concentration not greater than 500 ppm, the impurity Fe being as spherical particles having respective diameters not greater than 50 pm.
The hexagonal boron nitride powder of claim 1, wherein the average particle diameter (D so) and void ratio of the agglomerated particle body are in a range of 20 pm to 80 m, inclusive, and not greater than 50%, respectively. original
The hexagonal boron nitride powder of claim 1, wherein the agglomerated particle body is produced by baking. original
The hexagonal boron nitride powder of claim 1, produced by a method comprising the steps of: nitridizing boron carbide in a nitrogen atmosphere having a nitrogen partial pressure of at least 5 kPa and a temperature of 1800 ° C to 2200 ° C, thereby forming a nitridization product; to the nitridization product, adding B₂₀₃ and/or a precursor thereof, thereby forming a mixture; decarbonizing the mixture in a non-oxidizing atmosphere at a temperature of 1500 ° C to 2200 ° C, thereby forming a decarbonization product; and Page 4 of 7 P1o 03598 -PC LUS/IIMi Attorney Reference Number 4082-88983-0 1 App li cation Number 13/440,859 pulverizing and classifying the decarbonization product according to particle size, thereby producing hexagonal boron nitride powder; wherein, during nitridization or after decarbonization, depressurization is performed at a pressure less than 100 kPa. Page 5 of 7
canceled
canceled
canceled
canceled
canceled
canceled
canceled
A method for producing hexagonal boron nitride powder, compris ing: subjecting boron carbide to a nitridization treatment in a nitrogen atmosphere having a nitrogen partial pressure of at least 5 kPa at temperature in a range of 1800 ° C to 2200 *C, inclusive, to produce a nitridization product; adding B₂₀₃ and/or a precursor thereof to the nitridization product to produce a mixture; decarbonizing the mixture in a non-oxidizing atmosphere at a temperature in a range of 1500 ° C to 2200 ° C, inclusive, to produce a decarbonization product; and subjecting the decarbonization product to pulverization and particle-size classification, to obtain hexagonal boron nitride powder, wherein a depressurizing step, performed at an internal pressure at 100 kPa or less, is conducted either during nitridization or after decarbonization. withdrawn
The method of claim 15, wherein the depressurizing step is performed at 80 kPa or less. withdrawn
Materials described outside the worked examples.
hexagonal boron nitride
h-BN
boron carbide
B₄C
Additional fabrication and treatment steps described in the patent.
Measurements and analyses referenced in the patent, with their drawing references.
FIG. 7 is a graph showing relationships between void ratio, bulk density, and strength of h-BN powder.
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
primary particle long diameter to thickness ratio (D/d) | 5–10 | h-BN |
agglomerated particle body average particle diameter (D50) | 2–200 |
Related documents with shared materials, methods, properties, or citations.
Patent
Atlas literature
Patent
US 8,679,429Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG. 1. The method also includes a depressurization step either during nitridization of B₄C or after the decarbonization step performed after nitridization. …
FIG. 2A. Whenever Fe is removed during nitridization, for example, it is preferable that Fe be removed by evaporation (by subjecting B₄C to depressurization …
FIGS. 3-5 are microscope photographs of BN particles after the aforementioned 15 treatment.
FIG. 4 is another microscope photograph of BN particles after decarbonization.
FIG. 5 also shows Fe as white spheres and also in a form originating from the pulverizing device (hammer). Note that the Fe granules are generally dispersed …
FIG. 6. The yield of each of sample products thus obtained by baking was 176.6 g. [0043] A portion (69.3 g) of each sample product produced by baking was …
FIG. 7 is a graph showing relationships between void ratio, bulk density, and strength of h-BN powder.
FIG. 8 is a graph showing the relationship between void ratio and thermal conductivity. Preferred Embodiments [0021] The present invention will be described in …
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A hexagonal boron nitride powder, characterized in that: primary particles of the powder exhibit a ratio (D/d) of long diameter (D) to thickness (d) in a range of 5 to 10; agglomerated particle bodies made of the primary particles have an average particle diameter (Dso) in a range of 2 p m to 200 p m, inclusive; and the powder has a bulk density in a range of 0.5 g/cm3 to 1.0 g/cm3 and impurity Fe at a concentration not greater than 500 ppm, the impurity Fe being as spherical particles having respective diameters not greater than 50 pm.
The hexagonal boron nitride powder of claim 1, wherein the average particle diameter (D so) and void ratio of the agglomerated particle body are in a range of 20 pm to 80 m, inclusive, and not greater than 50%, respectively. original
The hexagonal boron nitride powder of claim 1, wherein the agglomerated particle body is produced by baking. original
The hexagonal boron nitride powder of claim 1, produced by a method comprising the steps of: nitridizing boron carbide in a nitrogen atmosphere having a nitrogen partial pressure of at least 5 kPa and a temperature of 1800 ° C to 2200 ° C, thereby forming a nitridization product; to the nitridization product, adding B₂₀₃ and/or a precursor thereof, thereby forming a mixture; decarbonizing the mixture in a non-oxidizing atmosphere at a temperature of 1500 ° C to 2200 ° C, thereby forming a decarbonization product; and Page 4 of 7 P1o 03598 -PC LUS/IIMi Attorney Reference Number 4082-88983-0 1 App li cation Number 13/440,859 pulverizing and classifying the decarbonization product according to particle size, thereby producing hexagonal boron nitride powder; wherein, during nitridization or after decarbonization, depressurization is performed at a pressure less than 100 kPa. Page 5 of 7
canceled
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A method for producing hexagonal boron nitride powder, compris ing: subjecting boron carbide to a nitridization treatment in a nitrogen atmosphere having a nitrogen partial pressure of at least 5 kPa at temperature in a range of 1800 ° C to 2200 *C, inclusive, to produce a nitridization product; adding B₂₀₃ and/or a precursor thereof to the nitridization product to produce a mixture; decarbonizing the mixture in a non-oxidizing atmosphere at a temperature in a range of 1500 ° C to 2200 ° C, inclusive, to produce a decarbonization product; and subjecting the decarbonization product to pulverization and particle-size classification, to obtain hexagonal boron nitride powder, wherein a depressurizing step, performed at an internal pressure at 100 kPa or less, is conducted either during nitridization or after decarbonization. withdrawn
The method of claim 15, wherein the depressurizing step is performed at 80 kPa or less. withdrawn
Materials described outside the worked examples.
hexagonal boron nitride
h-BN
boron carbide
B₄C
Additional fabrication and treatment steps described in the patent.
Measurements and analyses referenced in the patent, with their drawing references.
FIG. 7 is a graph showing relationships between void ratio, bulk density, and strength of h-BN powder.
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
primary particle long diameter to thickness ratio (D/d) | 5–10 | h-BN |
agglomerated particle body average particle diameter (D50) | 2–200 |
Related documents with shared materials, methods, properties, or citations.
Patent
Atlas literature
Patent
US 8,679,429Patent drawings and their descriptions. Click a drawing to enlarge it.
FIG. 1. The method also includes a depressurization step either during nitridization of B₄C or after the decarbonization step performed after nitridization. …
FIG. 2A. Whenever Fe is removed during nitridization, for example, it is preferable that Fe be removed by evaporation (by subjecting B₄C to depressurization …
FIGS. 3-5 are microscope photographs of BN particles after the aforementioned 15 treatment.
FIG. 4 is another microscope photograph of BN particles after decarbonization.
FIG. 5 also shows Fe as white spheres and also in a form originating from the pulverizing device (hammer). Note that the Fe granules are generally dispersed …
FIG. 6. The yield of each of sample products thus obtained by baking was 176.6 g. [0043] A portion (69.3 g) of each sample product produced by baking was …
FIG. 7 is a graph showing relationships between void ratio, bulk density, and strength of h-BN powder.
FIG. 8 is a graph showing the relationship between void ratio and thermal conductivity. Preferred Embodiments [0021] The present invention will be described in …
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A hexagonal boron nitride powder, characterized in that: primary particles of the powder exhibit a ratio (D/d) of long diameter (D) to thickness (d) in a range of 5 to 10; agglomerated particle bodies made of the primary particles have an average particle diameter (Dso) in a range of 2 p m to 200 p m, inclusive; and the powder has a bulk density in a range of 0.5 g/cm3 to 1.0 g/cm3 and impurity Fe at a concentration not greater than 500 ppm, the impurity Fe being as spherical particles having respective diameters not greater than 50 pm.
The hexagonal boron nitride powder of claim 1, wherein the average particle diameter (D so) and void ratio of the agglomerated particle body are in a range of 20 pm to 80 m, inclusive, and not greater than 50%, respectively. original
The hexagonal boron nitride powder of claim 1, wherein the agglomerated particle body is produced by baking. original
The hexagonal boron nitride powder of claim 1, produced by a method comprising the steps of: nitridizing boron carbide in a nitrogen atmosphere having a nitrogen partial pressure of at least 5 kPa and a temperature of 1800 ° C to 2200 ° C, thereby forming a nitridization product; to the nitridization product, adding B₂₀₃ and/or a precursor thereof, thereby forming a mixture; decarbonizing the mixture in a non-oxidizing atmosphere at a temperature of 1500 ° C to 2200 ° C, thereby forming a decarbonization product; and Page 4 of 7 P1o 03598 -PC LUS/IIMi Attorney Reference Number 4082-88983-0 1 App li cation Number 13/440,859 pulverizing and classifying the decarbonization product according to particle size, thereby producing hexagonal boron nitride powder; wherein, during nitridization or after decarbonization, depressurization is performed at a pressure less than 100 kPa. Page 5 of 7
canceled
canceled
canceled
canceled
canceled
canceled
canceled
A method for producing hexagonal boron nitride powder, compris ing: subjecting boron carbide to a nitridization treatment in a nitrogen atmosphere having a nitrogen partial pressure of at least 5 kPa at temperature in a range of 1800 ° C to 2200 *C, inclusive, to produce a nitridization product; adding B₂₀₃ and/or a precursor thereof to the nitridization product to produce a mixture; decarbonizing the mixture in a non-oxidizing atmosphere at a temperature in a range of 1500 ° C to 2200 ° C, inclusive, to produce a decarbonization product; and subjecting the decarbonization product to pulverization and particle-size classification, to obtain hexagonal boron nitride powder, wherein a depressurizing step, performed at an internal pressure at 100 kPa or less, is conducted either during nitridization or after decarbonization. withdrawn
The method of claim 15, wherein the depressurizing step is performed at 80 kPa or less. withdrawn
Materials described outside the worked examples.
hexagonal boron nitride
h-BN
boron carbide
B₄C
Additional fabrication and treatment steps described in the patent.
Measurements and analyses referenced in the patent, with their drawing references.
FIG. 7 is a graph showing relationships between void ratio, bulk density, and strength of h-BN powder.
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
primary particle long diameter to thickness ratio (D/d) | 5–10 | h-BN |
agglomerated particle body average particle diameter (D50) | 2–200 |
Related documents with shared materials, methods, properties, or citations.
boron trioxide
B₂O₃
FIG. 8 is a graph showing the relationship between void ratio and thermal conductivity. Preferred Embodiments [0021] The present invention will be described in …
powder bulk density | 0.5–1 | h-BN |
impurity Fe concentration (spherical particles ≤ 50 µm diameter) | ≤ 500 | h-BN |
agglomerated particle body average particle diameter (D50) — narrower range (claim 2) | 20–80 | h-BN |
agglomerated particle body void ratio (claim 2) | ≤ 50 | h-BN |
powder strength (ratio of D50 at 0.3 MPa to D50 at 0.01 MPa injection pressure) | ≥ 0.4 | h-BN |
Temperature | 1500–2200 °C | — |
Temperature | 1800–2200 °C | — |
Pressure | ≤ 1 kPa | — |
Pressure | ≥ 5 kPa | — |
boron trioxide
B₂O₃
FIG. 8 is a graph showing the relationship between void ratio and thermal conductivity. Preferred Embodiments [0021] The present invention will be described in …
powder bulk density | 0.5–1 | h-BN |
impurity Fe concentration (spherical particles ≤ 50 µm diameter) | ≤ 500 | h-BN |
agglomerated particle body average particle diameter (D50) — narrower range (claim 2) | 20–80 | h-BN |
agglomerated particle body void ratio (claim 2) | ≤ 50 | h-BN |
powder strength (ratio of D50 at 0.3 MPa to D50 at 0.01 MPa injection pressure) | ≥ 0.4 | h-BN |
Temperature | 1500–2200 °C | — |
Temperature | 1800–2200 °C | — |
Pressure | ≤ 1 kPa | — |
Pressure | ≥ 5 kPa | — |
boron trioxide
B₂O₃
FIG. 8 is a graph showing the relationship between void ratio and thermal conductivity. Preferred Embodiments [0021] The present invention will be described in …
powder bulk density | 0.5–1 | h-BN |
impurity Fe concentration (spherical particles ≤ 50 µm diameter) | ≤ 500 | h-BN |
agglomerated particle body average particle diameter (D50) — narrower range (claim 2) | 20–80 | h-BN |
agglomerated particle body void ratio (claim 2) | ≤ 50 | h-BN |
powder strength (ratio of D50 at 0.3 MPa to D50 at 0.01 MPa injection pressure) | ≥ 0.4 | h-BN |
Temperature | 1500–2200 °C | — |
Temperature | 1800–2200 °C | — |
Pressure | ≤ 1 kPa | — |
Pressure | ≥ 5 kPa | — |
boron trioxide
B₂O₃
FIG. 8 is a graph showing the relationship between void ratio and thermal conductivity. Preferred Embodiments [0021] The present invention will be described in …
powder bulk density | 0.5–1 | h-BN |
impurity Fe concentration (spherical particles ≤ 50 µm diameter) | ≤ 500 | h-BN |
agglomerated particle body average particle diameter (D50) — narrower range (claim 2) | 20–80 | h-BN |
agglomerated particle body void ratio (claim 2) | ≤ 50 | h-BN |
powder strength (ratio of D50 at 0.3 MPa to D50 at 0.01 MPa injection pressure) | ≥ 0.4 | h-BN |
Temperature | 1500–2200 °C | — |
Temperature | 1800–2200 °C | — |
Pressure | ≤ 1 kPa | — |
Pressure | ≥ 5 kPa | — |