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
What materials are used in the Precision Hexagonal Boron Nitride Ceramic Sleeve?
We manufacture our ceramic sleeves primarily from hot-pressed hexagonal boron nitride (h-BN). For applications requiring enhanced hardness, we offer composite grades such as BN-Alumina or BN-Zirconia, allowing tailored performance to meet diverse industrial needs.
Can you customize the dimensions and tolerances of the ceramic sleeves?
Yes, we provide fully customizable dimensions and tight tolerances based on your specifications. Our precision CNC machining process enables complex geometries, ensuring the alumina ceramic sleeves meet exact industrial standards for your application.
How do you protect the ceramic sleeves from moisture during transit and storage?
Our products are vacuum packaged to prevent moisture absorption, which is critical since hexagonal boron nitride ceramics are hygroscopic. This ensures the industrial ceramic solutions maintain their properties and performance before installation at your facility.
What delivery timelines can I expect for standard and custom orders?
Standard-sized sleeves usually ship within 10 to 20 days. For customized or ultra-thin wall designs, the lead time extends to 25 to 40 days due to specialized manufacturing and inspection processes, ensuring consistent high quality for your project requirements.
