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Fire-resistant principle of hexagonal boron nitride coating
A class of inorganic non-metallic materials with a fire resistance of not less than 1580 ℃. Refractoriness refers to the Celsius temperature at which the cone sample of refractory material can withstand high temperatures without softening and melting without load. However, the definition of refractoriness cannot fully describe refractories, 1580 ℃ is not absolute.
Boron nitride coating is mainly used for special refractories. It can improve the service performance of refractories by adhering to the surface of refractories or by penetrating the working layer of refractories. The particle size of boron nitride is between 20 μm and 50 μm, the mass content of boron nitride is 30% - 85% and the mass content of boron oxide in the coating is between 2% and 5%. Boron nitride coating mainly consists of large boron nitride powder and boron oxide. Low-temperature boron oxide melts to form a high-viscosity melt and strengthens the bond of boron nitride coating. At the same time, due to the existence of the liquid phase, boron oxide also plays a role in the combustion aid. Boron oxide undergoes a nitration reaction at high temperature and turns into boron nitride. The reaction-generated boron nitride has a high activity and can promote The existence of boron nitride powder with large particles, the final coating will not be sintered compactly, and the shrinkage of the coating during sintering is small, to ensure separation of the substrate appearance.
If the hexagonal boron nitride (h-BN) coating is combined with wood to form so-called BN compacted wood, ideally, the inorganic flame retardant used for fire-resistant wood should have a high thermal conductivity in the plane of the coating In order to reduce the peak temperature of wood and improve the ignition performance, it has lower thermal conductivity in the direction perpendicular to the plane.
Compaction has proven to be an effective way to improve the fire resistance of wood because it can automatically form a charcoal layer when exposed to fire and thus plays an effective role in heat insulation and oxygen insulation. In addition, unlike other inorganic flame retardant nanomaterials, 2D h-BN plate is known to form a layered structure with anisotropic thermal properties, which exhibits good dimensional stability, ideal corrosion resistance and oxidation resistance. It is attractive in fire protection not only to reduce HRR, but also to improve ignition performance.
Boron nitride coating is mainly used for special refractories. It can improve the service performance of refractories by adhering to the surface of refractories or by penetrating the working layer of refractories. The particle size of boron nitride is between 20 μm and 50 μm, the mass content of boron nitride is 30% - 85% and the mass content of boron oxide in the coating is between 2% and 5%. Boron nitride coating mainly consists of large boron nitride powder and boron oxide. Low-temperature boron oxide melts to form a high-viscosity melt and strengthens the bond of boron nitride coating. At the same time, due to the existence of the liquid phase, boron oxide also plays a role in the combustion aid. Boron oxide undergoes a nitration reaction at high temperature and turns into boron nitride. The reaction-generated boron nitride has a high activity and can promote The existence of boron nitride powder with large particles, the final coating will not be sintered compactly, and the shrinkage of the coating during sintering is small, to ensure separation of the substrate appearance.
If the hexagonal boron nitride (h-BN) coating is combined with wood to form so-called BN compacted wood, ideally, the inorganic flame retardant used for fire-resistant wood should have a high thermal conductivity in the plane of the coating In order to reduce the peak temperature of wood and improve the ignition performance, it has lower thermal conductivity in the direction perpendicular to the plane.
Compaction has proven to be an effective way to improve the fire resistance of wood because it can automatically form a charcoal layer when exposed to fire and thus plays an effective role in heat insulation and oxygen insulation. In addition, unlike other inorganic flame retardant nanomaterials, 2D h-BN plate is known to form a layered structure with anisotropic thermal properties, which exhibits good dimensional stability, ideal corrosion resistance and oxidation resistance. It is attractive in fire protection not only to reduce HRR, but also to improve ignition performance.
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【Editor】：TanyunAll Rights Reserved: https://www.tanyunchem.com
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