Advanced Boron Nitride (BN) Ceramic | High Thermal Conductivity & Insulation Solutions

The following shows the differences between hexagonal boron nitride (h-BN) and cubic boron nitride (c-BN):

Hexagonal Boron Nitride (h - BN) has a layered graphite - like structure, lower thermal conductivity, lower hardness, higher electrical resistivity, good thermal stability up to 2,000°C, is used for high - temperature furnace components, electrical insulators, and thermal interface materials, comes in sintered ceramics, coatings, lubricant powders and is easily machineable;

Cubic Boron Nitride (c - BN) has a diamond - like cubic structure, higher thermal conductivity, much higher hardness, lower electrical resistivity, degrades above 1,400°C in air, is used for cutting tools, grinding wheels, and wear - resistant coatings, exists as polycrystalline compacts and thin films, and requires laser/EDM machining.

Yes.Adcerax offers fully customized boron nitride (BN) ceramics to meet precise equipment requirements. The following is the information we need to produce samples more quickly:

1. Application Equipment: ________ (semiconductor CVD furnace, aluminum melting furnace, laser, etc.)
2. Core Function: ________ (thermal insulation/conductivity/lubrication/corrosion resistance,etc.)
3. Maximum Temperature: ______°C / Operating Temperature: ______°C
4. Key Dimensions: Length ______ mm × Width ______ mm × Thickness ______ mm
5. Urgency Level: □ Standard (4-6 weeks) □ Expedited (2-3 weeks) □ Emergency (72 hours)
6. Supporting Documents: □ CAD file □ Sketch □ None (requires our design support)

Processing Methods for Boron Nitride Ceramics: 

1. Forming Techniques

• Cold Isostatic Pressing (CIP):
  Raw BN powder is compressed under 100-300 MPa pressure in flexible molds, ideal for complex geometries like crucibles. Achieves 50-60% green density.

• Injection Molding:
  BN powder mixed with thermoplastic binders (15-20% vol.) enables mass production of small, intricate parts like insulators. Debinding occurs at 400-600°C.

2. Sintering Processes

• Hot Pressing (HP):
  Temperatures up to 2,000°C under 20-30 MPa pressure produce high-density (>95% TD) BN components. Standard for furnace fixtures.

• Spark Plasma Sintering (SPS):
  Rapid sintering (minutes vs. hours) at 1,600-1,800°C minimizes grain growth, critical for nano-structured BN composites.

3. Machining & Finishing

• CNC Milling:
  Tungsten carbide tools cut as-sintered BN to ±0.05 mm tolerances. Coolant-free process prevents hydrolysis.

• Laser Cutting:
  CO₂ lasers (10.6 μm wavelength) create slots/chamfers in thin BN plates (<3 mm) with <50 μm kerf width.

4. Surface Engineering

• CVD Coating:
  Deposits 50-200 μm pyrolytic BN layers on graphite substrates for enhanced oxidation resistance.

• Plasma Spraying:
  Projects h-BN powder onto metal surfaces at 12,000°C plasma temps, forming wear-resistant thermal barriers.

2.BN Grade Comparison Chart：

3.Avoid These Selection Pitfalls:

• Myth 1: Prioritizing upfront cost alone

• Myth 2: Ignoring CTE (Coefficient of Thermal Expansion) matching.

Our technical experts will help you select the appropriate grade according to your specific operating conditions and performance requirements.

The following is a comparison table of three types of BN ceramics,Alumina ceramics and SIC ceramics:

Boron nitride ceramic excels in thermal conductivity, thermal shock resistance, electrical insulation, chemical stability, and self - lubrication, suitable for high - end applications like semiconductor wafer handling despite high initial cost;

Alumina ceramic has moderate properties, is vulnerable to some chemicals, and is cost - effective for general electrical insulation and medical uses but needs frequent replacement;

Silicon carbide ceramic offers high thermal conductivity and good oxidation resistance but is semiconductive, costly in thin sections, and used in automotive and aerospace applications.

BN ceramic has a layered hexagonal structure with weak inter-layer bonding, allowing it to be cut, drilled, or milled easily using standard carbide tools while maintaining electrical insulation and chemical stability.

You can purchase boron nitride ceramics directly from ADCERAX, a China-based factory specializing in BN ceramic manufacturing and precision machining. The company supplies BN tubes, rods, plates, rings, crucibles, and nozzles, all customizable to drawings with tight tolerances. ADCERAX supports both small-batch prototypes and large-scale OEM production, ensuring reliable quality, fast response, and global delivery.

High thermal conductivity BN ceramics combine rapid heat dissipation with excellent electrical insulation, making them ideal for demanding environments such as thermal management systems, vacuum furnaces, and semiconductor tooling. Their stability at temperatures above 2000 °C ensures efficient energy transfer while preventing contamination, outperforming traditional oxide ceramics in both thermal shock resistance and dimensional precision.