China Suppliers Customizable High Temperature Hot Press Boron Nitride Ceramic Tubes for Thermocouples
At ZG Ceramics, we create industrial ceramic products with many high quality ceramic materials. One of them is boron nitride. Typically, we use a type called hexagonal boron nitride. Hexagonal Boron Nitride is a heat and chemically resistant compound of Boron and Nitrogen. Along with graphitic boron nitride, it is the most stable crystalline form of boron nitride. Because it has a similar structure to graphite, and because it is white in color, you may also hear it called “white graphite.”
Some industries that typically benefit from hexagonal boron nitride ceramics include:
- Aerospace
- Metalforming
- Electronics
- Heating and Cooling
- Glass Fabrication
- Military and Defense
- Thermal Processing
- Power Generation and Electricity
- Mineral Processing
Boron nitride chemically inert, and possessed of low thermal conductivity, low thermal expansion and microwave transparency. It is also easily machined. In addition, it is non-wetting by glass, salts and most molten metals. This means that it cannot be wetted by any of these substances, and it is that much more resistant to chemical attacks.
Boron Nitride has unsurpassed thermal stability and is stable at temperatures up to 1000˚C in air, 1400˚ in vacuum, and 2800˚ C in an inert atmosphere. It is also self-lubricating, so it does not require the use of gas or water molecules trapped between its layers. Because of this, boron nitride ceramic parts can be used in a vacuum, which is essential for aerospace applications.
- Heat resistant
- Thermally stable (up to 1000˚C in air, 1400˚ in vacuum, and 2800˚ C in an inert atmosphere)
- Chemical resistant
- Chemically inert and stable
- Low thermal conductivity
- Low thermal expansion
- Low dielectric constant
- Non-wetting (glass, salts, some metals)
- Self-lubricating
- Easily machined
- Electrically insulating
Some of the most common boron nitride applications we complete include:
- Furnace fixture supports and components
- Melting crucibles for glass and metals
- Plasma and welding tip insulators
- High temp thermal complete systems
- Molten metal carrier pipes
- Nuclear reactor shields and linings
- Semiconductor wafers
- Ceramic bushings
- Heat radiation shielding
- Ceramic washers
- Transistor heat sinks
- Sputtering targets
- Microwave tubes
- Ceramic coating and paints
- Pump nozzles
- Nanotechnology
- Refractory molds for glass forming and titanium forming
- Ceramic electrical insulators
- Boats
- Thermocouple protection sheaths
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Comparison of Boron Nitride Ceramics
| Grade | BN997 | BN99 | BN-SI | BN-AL | BN-SIC | BN-ZR | BN-ALN |
| Main Composition | BN>99.7% | BN>99% | BN+AL+SI | BN+ZR+AL | BN+SIC | BN+ZRO2 | BN+ALN |
| Bonding Composition | B2O3 | B2O3 | Boron oxide silicon | Boron oxide aluminum | Boron oxide aluminum | B2O3 | Boron oxide aluminum |
| Density (g/cm3) | 1.6 | 2 | 2.2-2.3 | 2.25-2.35 | 2.4-2.5 | 2.8-2.9 | 2.8-2.9 |
| Room Temperature Electric Resistivity (Ω·cm) | >1014 | >1014 | >1013 | >1013 | >1012 | >1012 | >1013 |
Max Using Temperature (℃)
In Atmosphere
In Inactive Gas
In High Vacuum (Long Time) | 900
2100
1800 | 900
2100
1800 | 900
1750
1750 | 900
1750
1750 | 900
1800
1800 | 900
1800
1800 | 900
1750
1750 |
| Three-Point Bending Strength (MPA) | 18 | 35 | 65 | 65 | 80 | 90 | 90 |
| Compressive Strength (MPA) | 45 | 85 | 145 | 145 | 175 | 220 | 220 |
Thermal Expansion Coefficient (20-1000℃)
(10-6/K) | 1.5 | 1.8 | 2.0 | 2.0 | 2.8 | 3.5 | 2.8 |
| Thermal Conductivity (W/m·k) | 35 | 40 | 35 | 35 | 45 | 30 | 85 |
| Typical Application: | High Temperature Furance | High Temperature Furance | Powder Metallurgy | Powder Metallurgy | Powder Metallurgy | Metal Casting | High Temperature
Equipment |
| High Temperature Electrical Furnace Components (High Temperature Insulator Sleeve Tube etc) | | Y | Y | Y | Y | Y | Y |
| Metal Vaporize Crucible | | Y | | | | | Y |
| The Container Of Metal or Glass Melting | Y | Y | Y | Y | Y | Y | Y |
| The Casting Mould Components Of The Precious Metal And Special Alloy. | | | | Y | | | Y |
| High Temperature Support Part | | | | Y | | Y | Y |
| Nozzle And Transport Tube Of The Melting Metal | | Y | Y | Y | Y | Y | Y |
| Remark: The value is just for review, different using conditions will have a little difference. |
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BN997 Boron Nitride Machinable Ceramic Tubes For Thermocouples Images
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