Abstract: A boron nitride powder including flat-shaped primary particles of BN and an aggregate of the primary particles has a water permeation speed less than 1 mm2/s and oil absorption of 100 ml/100 g to 500 ml/100 g, which is a cosmetic boron nitride powder excellent in water repellency and oil absorbency. The use of such a boron nitride powder provides a cosmetic significantly improved not only in gloss finish and transparency (bare skin feeling) but also in sustainability.

Abstract: A boron nitride powder including flat-shaped primary particles of BN and an aggregate of the primary particles has a water permeation speed not less than 1 mm2/s and oil absorption of 100 ml/100 g to 500 ml/100 g, which is a cosmetic boron nitride powder with high hydrophilicity and high oil absorbency. The use of such a boron nitride powder provides a cosmetic that is significantly improved not only in gloss finish and transparency (bare skin feeling) but also in sustainability.

Abstract: Sintered spherical BN particles having secondary particles formed of aggregated primary BN particles, in which the number ratio of particles, each having a recess on its surface is 50% or more in the sintered spherical BN particles, and each of the sintered spherical BN particles has a compressive strength of 0.1 MPa to 100 MPa. The sintered spherical BN particles are not only excellent in heat dissipation properties and adhesiveness, but also have high compressive strength, and therefore, show a small variation in heat dissipation properties and is free from conduction failure, which would otherwise be caused by exfoliation of the copper foil, when used as a filling material for a polymer composite material.

Abstract: A boron nitride powder including flat-shaped primary particles of BN and an aggregate of the primary particles has a water permeation speed less than 1 mm2/s and oil absorption of 100 ml/100 g to 500 ml/100 g, which is a cosmetic boron nitride powder excellent in water repellency and oil absorbency. The use of such a boron nitride powder provides a cosmetic significantly improved not only in gloss finish and transparency (bare skin feeling) but also in sustainability.

Abstract: A boron nitride powder including flat-shaped primary particles of BN and an aggregate of the primary particles has a water permeation speed not less than 1 mm2/s and oil absorption of 100 ml/100 g to 500 ml/100 g, which is a cosmetic boron nitride powder with high hydrophilicity and high oil absorbency. The use of such a boron nitride powder provides a cosmetic that is significantly improved not only in gloss finish and transparency (bare skin feeling) but also in sustainability.

Abstract: Sintered spherical BN particles having secondary particles formed of aggregated primary BN particles, in which the number ratio of particles, each having a recess on its surface is 50% or more in the sintered spherical BN particles, and each of the sintered spherical BN particles has a compressive strength of 0.1 MPa to 100 MPa. The sintered spherical BN particles are not only excellent in heat dissipation properties and adhesiveness, but also have high compressive strength, and therefore, show a small variation in heat dissipation properties and is free from conduction failure, which would otherwise be caused by exfoliation of the copper foil, when used as a filling material for a polymer composite material.

Abstract: A hexagonal boron nitride (h-BN) powder is disclosed in which 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 (D50) in a range of 2 ?m to 200 ?m, inclusive, and the powder has a bulk density in a range of 0.5 g/cm3 to 1.0 g/cm3. In an exemplary method for producing the h-BN, boron carbide is nitridizated in a nitrogen partial pressure of at least 5 kPa at 1800° C. to 2200° C., inclusive. B2O3 (or precursor thereof) is added to the nitridization product to produce a mixture. The mixture is decarbonized in a non-oxidizing atmosphere at a 1500° C. to 2200° C., inclusive. The decarbonization product is pulverized and subject to particle-size classification, yielding H-BN powder. The method includes a depressurizing step, performed at 100 kPa or less either during nitridization or after decarbonization.

Abstract: A hexagonal boron nitride (h-BN) powder is disclosed in which 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 (D50) in a range of 2 ?m to 200 ?m, inclusive, and the powder has a bulk density in a range of 0.5 g/cm3 to 1.0 g/cm3. In an exemplary method for producing the h-BN, boron carbide is nitridizated in a nitrogen partial pressure of at least 5 kPa at 1800° C. to 2200° C., inclusive. B2O3 (or precursor thereof) is added to the nitridization product to produce a mixture. The mixture is decarbonized in a non-oxidizing atmosphere at a 1500° C. to 2200° C., inclusive. The decarbonization product is pulverized and subject to particle-size classification, yielding H-BN powder. The method includes a depressurizing step, performed at 100 kPa or less either during nitridization or after decarbonization.

Abstract: Continuous casting facilities generally including a pair of moulds with a rail on each side thereof. Self-propelled tundish cars each carrying a tundish with a detachable immersion nozzle ride on the rails. The apparatus includes a truck running on the rail opposite the operator's side of the moulds connectable with one of the tundish cars and carrying an immersion nozzle exchanger. A connecting piece feeder, a powder feeder, and an immersion nozzle preheater are also mountable on the truck. Equipment interferences are eliminated by the specific structures and the operator's view of the moulds is not obstructed.