Product Name: High-Purity Hexagonal Boron Nitride (BN) Tube
Product Material: Hot-Pressed Boron Nitride (HPNB), PBN (Pyrolytic Boron Nitride) for high-purity coatings or thin-wall tubes.
Material Characteristics: Excellent thermal shock resistance, Outstanding electrical insulation even at high temperatures, High thermal conductivity (similar to graphite), Excellent lubricity (self-lubricating), Non-wetting to most molten metals and glass, Chemically inert, Easily machinable to precise tolerances.
Application Fields: Insulators for high-temperature vacuum furnaces, Molten metal atomization nozzles, Thermocouple protection tubes for aggressive alloys, Glass forming tools, Crucible liners, Plasma arc insulators, Ion implantation components.
Application Industries: Biomedical (High-purity laboratory crucibles), Advanced Machinery (Molten metal processing), New Energy (Crystal growth components), Fluid Control (High-temperature gas nozzles), Electronic Engineering (Heat sinks and insulators), Aerospace (Plasma thruster components), Petrochemical (Catalyst carriers), Broad Semiconductor (Wafer processing and MBE systems).
Processing Difficulties: Managing the inherent anisotropy of hot-pressed BN during machining, Preventing moisture absorption (hygroscopicity) in certain grades, Achieving ultra-thin wall thickness without brittle fracture, Controlling precision surface finish on a naturally soft ceramic.
Processing Flow: BN powder synthesis → Hot-press sintering (vacuum or inert gas) → Billet inspection → Precision CNC machining (turning, drilling, milling) → High-temperature bake-out (to remove moisture/binders) → 100% dimensional inspection → Vacuum sealed packaging.
Delivery Period: Standard specifications: 10-20 days, Customized high-purity or complex geometries: 25-40 days.
The Boron Nitride Tube is a highly specialized ceramic component designed for environments where electrical insulation and high thermal conductivity must coexist. Often referred to as "White Graphite," BN tubes offer the unique advantage of being easily machinable with standard metalworking tools while providing performance that exceeds most oxides at high temperatures. Its exceptional resistance to thermal shock allows it to withstand rapid temperature changes without cracking. Most importantly, its non-wetting characteristic against molten aluminum, magnesium, and zinc makes it the preferred material for protective sleeves and nozzles in non-ferrous metallurgy.
Key Features
Self-Lubricating Property: Low friction coefficient ensures zero sticking for molten glass or metals.
Thermal Conductivity: Efficient heat dissipation while maintaining superior electrical insulation.
Superior Thermal Shock Resistance: Can survive thousands of degrees of temperature fluctuation in seconds.
Excellent Machinability: Can be machined into complex, high-precision shapes with tight tolerances.
High Chemical Purity: Minimal outgassing in vacuum environments, critical for semiconductor and crystal growth processes.
