Abstract: Disclosed is a hexagonal boron nitride powder having excellent glitter property. A hexagonal boron nitride powder includes hexagonal boron nitride particles, in which among the hexagonal boron nitride particles, a number ratio of particles having a bent structure at an angle of 110° to 160° with respect to (0,0,1) crystal plane of the primary particles is 30% or more.

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: 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: An object of the present invention is to provide method and apparatus for manufacturing medium or low carbon ferromanganese at reduced running costs.In order to achieve the above object, the present invention resides in charging molten high carbon ferromanganese into a refining vessel of a top blowing type, and blowing oxygen gas on the surface of the molten high carbon ferromanganese from above and injecting a mixed gas having the following composition into the molten high carbon ferromanganese from bottom. The mixed gas composition comprises 65-100% of CO, 0-25% of CO.sub.2 and 0-10% of N.sub.2. In a case, argon gas is used as the bottom-blown gas.