Boron Nitride Crucible
Dimensions: H<12”, OD or W&L<12”, Wall thick>2mm
Custom Boron Nitride Crucibles for High-Temperature Processing
Edgetech Ceramics Division supplies custom-machined boron nitride crucible for vacuum furnaces, inert-atmosphere processing, evaporation systems, laboratory equipment, and selected molten-material applications.
Hot-pressed boron nitride is valued for its high-temperature capability, electrical insulation, thermal-shock resistance, and relatively low wettability with many process materials. However, crucible performance depends on more than the basic material name. The BN grade, operating atmosphere, temperature, processed material, heating cycle, wall geometry, and handling method must all be considered.
Custom hot-pressed boron nitride crucible
Edgetech Ceramics Division reviews customer drawings and operating conditions before recommending a material grade or crucible configuration. Standard and custom geometries can be evaluated according to size, purity, atmosphere, thermal cycle, and contamination requirements.
Why Use Boron Nitride for Crucibles?
Boron nitride is frequently selected for applications in which conventional oxide ceramics, graphite, or metal containers may create contamination, wetting, electrical, or thermal-management problems.
Depending on the selected BN grade and operating conditions, potential advantages include:
- Good resistance to rapid temperature changes
- Electrical insulation at elevated temperatures
- Low wettability with many molten materials
- Good machinability compared with many advanced ceramics
- Low density
- Compatibility with vacuum and inert-atmosphere equipment
- Availability in custom-machined shapes
- Reduced risk of contamination in selected high-purity processes
These properties vary by grade. The exact composition and service environment should be reviewed before the crucible is approved for production use.
| Boron Nitride Crucible Typical Product Information | |
| Property | Available Range or Requirement |
| Material | Hot-pressed boron nitride |
| Available grades | BN99, BN997 |
| BN content | 99%, 99.7% |
| Binder or additive system | No binder, no sintering additives |
| Maximum outside diameter | 500mm |
| Maximum height | 500mm |
| Minimum wall thickness | 1mm |
| Dimensional tolerance | +/-0.2mm |
| Surface finish | Ra 3.2um |
| Operating temperature in air | 900C |
| Operating temperature in vacuum | 1800C |
| Operating temperature in inert gas | 2100C |
| Custom machining | Available according to drawing |
| Inspection documents | COA, dimensional inspection report, etc. available |
Boron Nitride Grade Selection
Hot-pressed boron nitride is a family of materials rather than one standardized composition. Different grades may contain different binders or additives to improve strength, moisture resistance, electrical performance, machinability, or high-temperature stability.
Machined BN crucible with custom dimensions
The best grade for a crucible depends on several factors:
- Normal and maximum operating temperature
- Furnace atmosphere
- Vacuum level
- Gas composition
- Material being melted, evaporated, or processed
- Required purity
- Acceptable impurity limits
- Heating and cooling rate
- Expected service cycles
- Cleaning and handling procedures
For contamination-sensitive applications, the complete material composition should be reviewed rather than relying only on the nominal BN percentage.
Edgetech can provide customized Boron Nitride ceramic products.
Custom Crucible Shapes and Machining
ETI Ceramics can evaluate custom boron nitride crucibles according to customer drawings or application requirements. Common configurations may include:
- Cylindrical crucibles
- Rectangular containers
- Tapered crucibles
- Lidded crucibles
- Flanged crucibles
- Boats and trays
- Crucibles with holes or slots
- Thin-wall components
- Multi-cavity configurations
- Custom laboratory and furnace components
The drawing should identify all critical dimensions, tolerances, wall thicknesses, corner radii, bottom geometry, and mounting features.
Avoid sharp internal corners and abrupt changes in wall thickness where possible, as they may increase local stress during heating and cooling.
Boron Nitride Crucible Basic Information
| Physical Property | |||
| Item | Units | BN99, >99.3% | BN997, >99.7% |
| Color | \ | White | White |
| Density | g/cm3 | 2 | 1.6 |
| Mechanical properties | |||
| Mohs hardness | 2 | 2 | |
| Flexural strength | Mpa | 35 | 20 |
| Thermal properties | |||
| Maximum Use Temperature | in Air | 900℃ | 900℃ |
| in Vacuum | 1800℃ | 1800℃ | |
| Under an inert atmosphere | 2100℃ | 2100℃ | |
| Thermal Conductivity(20℃) | W/(m·K) | 40 | 50 |
| Thermal Expansion Coefficient(20℃-1000℃) | 10-6/K | 2 | -0.5 |
| Electrical properties | |||
| Volume Resistivity | Ω.cm | >10^14 | >10^14 |
Boron Nitride Crucibles (BN Crucibles): Key Applications in High-Temperature and Industrial Processes
Boron nitride (BN) crucibles are essential in industries requiring extreme heat resistance and chemical stability. Their unique properties make them ideal for:
Boron nitride crucible for vacuum furnace applications
1. High-Temperature Molten Metal Handling
BN crucibles safely hold and transport molten metals (such as aluminum, magnesium, and gold) without cracking or contaminating the material, ensuring purity in casting and alloy production.
2. Metal Smelting & Refining
Used as durable, non-reactive containers in smelting furnaces, BN crucibles prevent unwanted reactions with molten metals, improving yield and reducing impurities.
3. High-Performance Metallurgical Processing
In metallurgy, BN crucibles serve as ultra-stable thermal containers for sintering, annealing, and alloy development, maintaining performance even under rapid temperature changes.
4. Precision Glass Molding
Because of their low thermal expansion and smooth surface, BN crucibles serve as high-temperature molds for optical glass shaping, ensuring defect-free finishes.
5. Corrosion-Resistant Chemical Experimentation
In labs, BN crucibles withstand aggressive acids, alkalis, and salts, making them perfect for chemical synthesis, catalyst testing, and high-purity material research.
Secure Packaging for Boron Nitride Ceramic Crucibles (BN ceramic crucible)– Ensuring Safe Delivery
While boron nitride (BN) offers exceptional thermal and chemical resistance, its ceramic nature makes it vulnerable to impact damage during transit. To guarantee your crucibles arrive in perfect condition, we implement rigorous protective packaging protocols:
Multi-Layer Protective Packaging
Reinforced Outer Boxes – Heavy-duty corrugated cardboard or wooden crates shield against handling shocks
Customized Cushioning – High-density foam or molded pulp inserts prevent movement and absorb vibrations
Vacuum Sealing (When Required) – Critical components are nitrogen-flushed and vacuum-sealed to prevent moisture damage
Why Our Packaging Matters
Minimizes Breakage Risk – Fragile ceramic structures require specialized handling
Preserves Product Integrity – Prevents micro-cracks that could compromise high-temperature performance
Adapts to Shipment Needs – Solutions range from standard freight to international air transport
Recommended Call to Action
Request a Custom Boron Nitride Crucible
Send ETI Ceramics your drawing together with the operating temperature, furnace atmosphere, process material, and expected quantity. Our team will review the required BN grade, dimensions, machining features, and inspection requirements before quotation.
Recommended FAQ Content
What is the maximum operating temperature of a boron nitride crucible?
The operating limit depends on the BN grade, atmosphere, exposure time, component geometry, and process material. Temperature limits in air are normally different from those in vacuum or an inert atmosphere. ETI Ceramics should confirm the applicable value for the exact grade being quoted.
Can a boron nitride crucible be used in air?
Boron nitride can be used under some oxidizing conditions, but oxidation becomes increasingly important as temperature and exposure time increase. Continuous operating limits in air should not be assumed from vacuum or inert-gas data.
Can ETI Ceramics manufacture a crucible from my drawing?
Custom dimensions and geometries can be evaluated from a dimensional drawing or 3D model. Manufacturability depends on the overall size, wall thickness, tolerances, corner design, and selected BN grade.
Is boron nitride compatible with every molten metal?
No ceramic material should be assumed to be universally compatible. Suitability depends on the exact alloy or process material, temperature, atmosphere, holding time, and BN grade. Testing may be recommended for a new or contamination-sensitive process.
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