Product Name: Precision Hexagonal Boron Nitride (h-BN) Ceramic Sleeve
Product Material: Hot-Pressed Hexagonal Boron Nitride (h-BN), optional composite grades (e.g., BN-Alumina or BN-Zirconia for higher hardness).
Material Characteristics: Extreme thermal shock resistance, Outstanding electrical insulation at temperatures up to 2000°C (inert atmosphere), Excellent thermal conductivity (similar to graphite), Self-lubricating (low friction coefficient), Non-wetting to molten Aluminum, Zinc, Magnesium, and Glass, Easily machinable to tight tolerances.
Application Fields: High-temperature vacuum furnace insulators, Molten metal atomization nozzles, Thermocouple protection sleeves for aggressive alloys, Glass forming liners, Plasma arc insulators, PVD/CVD deposition masks, Ion implantation hardware.
Application Industries: Biomedical (Laboratory equipment), Advanced Machinery (Non-ferrous metal casting), New Energy (Crystal growth systems), Fluid Control (High-temperature gas nozzles), Electronic Engineering (RF/Microwave heat sinks), Aerospace (Plasma thruster components), Petrochemical (Thermal sensors), Broad Semiconductor (MBE and CVD tools).
Processing Difficulties: Managing the inherent anisotropy of hot-pressed BN billets during sleeve machining, Preventing moisture absorption (hygroscopicity) in standard grades, Achieving ultra-thin wall thickness without brittle fracture, Controlling precision surface finish on a naturally soft ceramic to avoid micro-tearing.
Processing Flow: BN powder synthesis → Vacuum hot-press sintering → Billet quality inspection → Precision CNC turning/drilling → High-temperature vacuum bake-out → Dimensional and concentricity inspection → Moisture-proof vacuum packaging.
Delivery Period: Standard specifications: 10-20 days, Customized complex or thin-walled sleeves: 25-40 days.
The Hexagonal Boron Nitride (h-BN) Sleeve, known as "White Graphite," is a unique ceramic component designed for environments where electrical insulation and high thermal conductivity must coexist. These sleeves offer a distinct advantage: they can be easily machined into complex geometries using standard metalworking tools, enabling rapid prototyping and precision fitting. Their exceptional thermal shock resistance allows them to withstand thousands of temperature cycles without cracking. Most importantly, their non-wetting characteristic against molten non-ferrous metals makes them the premier choice for protective sleeves in high-purity metallurgy and semiconductor processing.
Key Features:
Instant Machinability: Can be turned, drilled, and milled into intricate sleeve designs with high precision.
Superior Thermal Management: Efficiently dissipates heat while providing a reliable electrical barrier.
Immunity to Thermal Shock: Can survive being plunged directly into molten metals or exposed to plasma arcs.
Non-Stick Surface: Molten glass and metals do not adhere to the sleeve, minimizing maintenance and contamination.
Our Market Advantages
