Patent
US 12,428,297 B2HEXAGONAL BORON NITRIDE POWDER AND METHOD FOR PRODUCING THE SAME
Shota Daiki, Yuuki Hirozane
TOKUYAMA CORPORATION, Shunan (JP)·Sep. 30, 2025·US
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Average particle diameter (preferred range) | 2–90 µm | BN |
Fe elemental content (preferred, description) | ≤ 10 ppm | BN |
Eluted boron (as B2O3) after immersion in 0.02 mol/L H2SO4 at 25°C for 120 min | ≤ 200 ppm | BN |
Eluted calcium after immersion in 0.02 mol/L H2SO4 at 25°C for 120 min | ≤ 50 ppm | BN |
Eluted sodium after immersion in 0.02 mol/L H2SO4 at 25°C for 120 min | ≤ 20 ppm | BN |
Eluted silicon after immersion in 0.02 mol/L H2SO4 at 25°C for 120 min | ≤ 20 ppm | BN |
Eluted chlorine after immersion in water at 25°C for 120 min | ≤ 10 ppm | BN |
Thickness | 250–300 µm | — |
Temperature | 1700–2000 °C | — |
Temperature | 1750–1950 °C | — |
Temperature | 50–250 °C | — |
Thickness | 5–70 µm | — |
Duration | 2–10 hours | — |
Thickness | 20–250 µm | — |
Thickness | 50–180 µm | — |
Thickness | 70–150 µm | — |
Pressure | 5–20 pa | — |
Pressure | 10–45 pa | — |
Thickness | 10–70 µm | — |
Thickness | ≤ 2 µm | — |
Thickness | ≤ 30 cm | — |
Temperature | ≤ 1200 °C | — |
Thickness | ≤ 20 µm | — |
Thickness | ≥ 90 µm | — |
Temperature | ≥ 1550 °C | — |
Thickness | ≥ 250 µm | — |
Average particle diameter (preferred range) | 2–90 µm | BN |
Fe elemental content (preferred, description) | ≤ 10 ppm | BN |
Eluted boron (as B2O3) after immersion in 0.02 mol/L H2SO4 at 25°C for 120 min | ≤ 200 ppm | BN |
Eluted calcium after immersion in 0.02 mol/L H2SO4 at 25°C for 120 min | ≤ 50 ppm | BN |
Eluted sodium after immersion in 0.02 mol/L H2SO4 at 25°C for 120 min | ≤ 20 ppm | BN |
Eluted silicon after immersion in 0.02 mol/L H2SO4 at 25°C for 120 min | ≤ 20 ppm | BN |
Eluted chlorine after immersion in water at 25°C for 120 min | ≤ 10 ppm | BN |
Thickness | 250–300 µm | — |
Temperature | 1700–2000 °C | — |
Temperature | 1750–1950 °C | — |
Temperature | 50–250 °C | — |
Thickness | 5–70 µm | — |
Duration | 2–10 hours | — |
Thickness | 20–250 µm | — |
Thickness | 50–180 µm | — |
Thickness | 70–150 µm | — |
Pressure | 5–20 pa | — |
Pressure | 10–45 pa | — |
Thickness | 10–70 µm | — |
Thickness | ≤ 2 µm | — |
Thickness | ≤ 30 cm | — |
Temperature | ≤ 1200 °C | — |
Thickness | ≤ 20 µm | — |
Thickness | ≥ 90 µm | — |
Temperature | ≥ 1550 °C | — |
Thickness | ≥ 250 µm | — |
Average particle diameter (preferred range) | 2–90 µm | BN |
Fe elemental content (preferred, description) | ≤ 10 ppm | BN |
Eluted boron (as B2O3) after immersion in 0.02 mol/L H2SO4 at 25°C for 120 min | ≤ 200 ppm | BN |
Eluted calcium after immersion in 0.02 mol/L H2SO4 at 25°C for 120 min | ≤ 50 ppm | BN |
Eluted sodium after immersion in 0.02 mol/L H2SO4 at 25°C for 120 min | ≤ 20 ppm | BN |
Eluted silicon after immersion in 0.02 mol/L H2SO4 at 25°C for 120 min | ≤ 20 ppm | BN |
Eluted chlorine after immersion in water at 25°C for 120 min | ≤ 10 ppm | BN |
Thickness | 250–300 µm | — |
Temperature | 1700–2000 °C | — |
Temperature | 1750–1950 °C | — |
Temperature | 50–250 °C | — |
Thickness | 5–70 µm | — |
Duration | 2–10 hours | — |
Thickness | 20–250 µm | — |
Thickness | 50–180 µm | — |
Thickness | 70–150 µm | — |
Pressure | 5–20 pa | — |
Pressure | 10–45 pa | — |
Thickness | 10–70 µm | — |
Thickness | ≤ 2 µm | — |
Thickness | ≤ 30 cm | — |
Temperature | ≤ 1200 °C | — |
Thickness | ≤ 20 µm | — |
Thickness | ≥ 90 µm | — |
Temperature | ≥ 1550 °C | — |
Thickness | ≥ 250 µm | — |
Average particle diameter (preferred range) | 2–90 µm | BN |
Fe elemental content (preferred, description) | ≤ 10 ppm | BN |
Eluted boron (as B2O3) after immersion in 0.02 mol/L H2SO4 at 25°C for 120 min | ≤ 200 ppm | BN |
Eluted calcium after immersion in 0.02 mol/L H2SO4 at 25°C for 120 min | ≤ 50 ppm | BN |
Eluted sodium after immersion in 0.02 mol/L H2SO4 at 25°C for 120 min | ≤ 20 ppm | BN |
Eluted silicon after immersion in 0.02 mol/L H2SO4 at 25°C for 120 min | ≤ 20 ppm | BN |
Eluted chlorine after immersion in water at 25°C for 120 min | ≤ 10 ppm | BN |
Thickness | 250–300 µm | — |
Temperature | 1700–2000 °C | — |
Temperature | 1750–1950 °C | — |
Temperature | 50–250 °C | — |
Thickness | 5–70 µm | — |
Duration | 2–10 hours | — |
Thickness | 20–250 µm | — |
Thickness | 50–180 µm | — |
Thickness | 70–150 µm | — |
Pressure | 5–20 pa | — |
Pressure | 10–45 pa | — |
Thickness | 10–70 µm | — |
Thickness | ≤ 2 µm | — |
Thickness | ≤ 30 cm | — |
Temperature | ≤ 1200 °C | — |
Thickness | ≤ 20 µm | — |
Thickness | ≥ 90 µm | — |
Temperature | ≥ 1550 °C | — |
Thickness | ≥ 250 µm | — |