Beryllium Oxide (BeO) Ceramic Cylinders – Precision Engineered for Harsh Environments: High Temperature, High Pressure, Chemical Corrosion
Beryllium Oxide (BeO) ceramic cylinders are high-performance precision components manufactured from **99.5% high-purity beryllia**. They combine **extreme thermal conductivity (285 W/m·K)** , **excellent electrical insulation**, and **outstanding mechanical strength** with exceptional resistance to **thermal shock, chemical corrosion, and high-pressure environments**.
BeO ceramic cylinders—also referred to as **clamping cartridges, tubes, bushings, or sleeves**—are designed to **clamp, secure, protect, and isolate** critical components in the most demanding industrial and scientific applications. They are widely used in **semiconductor wafer processing, high-temperature heat treatment furnaces, chemical laboratories, aerospace propulsion systems, and medical devices**.
Coraynic Technology offers **custom-engineered BeO ceramic cylinders** in a wide range of **inner diameters (ID), outer diameters (OD), lengths, and wall thicknesses**. Precision CNC ground to tight tolerances, our cylinders are available with **plain ends, stepped bores, flanged rims, threaded surfaces, and metallized coatings (MoMn/Ni/Au)** for brazing and hermetic sealing.
With a **dielectric constant of 6.6 @1MHz** and a **dissipation factor of ≤4×10⁻⁴**, BeO cylinders introduce minimal signal loss, making them suitable for **RF/microwave vacuum device envelopes** and **high-frequency feedthrough insulators**.
## Key Features & Benefits
– **Ultra-High Thermal Conductivity:** 285 W/m·K @25°C – 10× Al₂O₃, 1.5× AlN – ideal for heat dissipation in confined spaces.
– **Exceptional Thermal Stability:** Melting point 2530°C; continuous operation up to 2000°C.
– **Chemical Inertness:** Resistant to acids, alkalis, and molten metals; ≤0.1 mg/cm² weight loss in HCl/NaOH.
– **High Mechanical Strength:** Flexural strength ≥200 MPa, compressive strength >350 MPa.
– **Precision Tolerances:** ID/OD ±0.5%, length ±0.1 mm, concentricity <0.05 mm.
– **Custom Geometry:** Stepped bores, tapered walls, flanged ends, threaded surfaces, through holes, slots.
– **Metallization Options:** MoMn + Ni/Au plated – solderable, brazable, hermetic.
– **Electrical Insulation:** Volume resistivity >10¹⁴ Ω·cm; dielectric strength ≥40 kV/mm.
– **Low Dielectric Loss:** 6.6 @1MHz, tan δ ≤0.0004 – suitable for high-frequency applications.
– **Non-Toxic & Biocompatible:** Odorless, tasteless, and safe for medical device components.
## Technical Specifications (99.5% BeO Cylinder)
| Property | Unit | Value |
|———-|——|——-|
| Purity | % | 99.5 |
| Grade | – | B-99.5 |
| Density | g/cm³ | ≥2.88 |
| Color | – | White |
| Melting Point | °C | 2530 ±10 |
| Maximum Working Temperature | °C | 2000 (continuous) |
| Thermal Conductivity (25°C) | W/m·K | 285 |
| Thermal Conductivity (100°C) | W/m·K | 220 |
| Dielectric Constant (1MHz) | – | 6.6 ±0.2 |
| Dielectric Constant (10GHz) | – | 6.8 ±0.2 |
| Dissipation Factor (1MHz) | – | ≤4×10⁻⁴ |
| Dissipation Factor (10GHz) | – | ≤4×10⁻⁴ |
| CTE (25–500°C) | ×10⁻⁶/°C | 7.0 – 8.0 |
| Volume Resistivity (25°C) | Ω·cm | >10¹⁴ |
| Dielectric Strength (DC) | kV/mm | ≥40 |
| Flexural Strength | MPa | ≥200 |
| Compressive Strength | MPa | >350 |
| Hardness (Knoop) | – | 1200 |
| Poisson’s Ratio | – | 0.26 |
| Young’s Modulus | GPa | 345 |
| Grain Size | μm | 10 – 20 |
| Surface Roughness (Ra) | μm | 0.2 – 0.8 (as ground); <0.1 (polished) |
| Air Tightness | Pa·m³/s | ≤5×10⁻¹² |
| Chemical Stability (HCl/NaOH) | mg/cm² | ≤0.1 |
## Standard & Custom Dimensions
### Cylinder / Tube Dimensions
| Parameter | Standard Range | Custom Range |
|———-|—————-|————–|
| Outer Diameter (OD) | 5 – 100 mm | 2 – 200 mm |
| Inner Diameter (ID) | 3 – 90 mm | 1 – 180 mm |
| Wall Thickness | 1 – 20 mm | 0.5 – 30 mm |
| Length | 5 – 200 mm | 2 – 500 mm |
### Tolerance
| Parameter | Tolerance |
|———-|———–|
| Outer Diameter (OD) | ±0.5% |
| Inner Diameter (ID) | ±0.5% |
| Length | ±0.1 mm |
| Concentricity | <0.05 mm |
| Camber | <0.1% |
### Custom End Configurations
– **Stepped bores** – multiple internal diameters
– **Tapered walls** – conical profiles
– **Flanged ends** – mounting rims, collars
– **Threaded surfaces** – internal or external threads
– **Slotted / notched** – alignment features
– **Metallized bands** – MoMn + Ni/Au for brazing
– **Through holes / blind holes** – radial or axial
## Applications
### 1. Semiconductor Manufacturing
– Wafer clamping and handling cartridges
– Chip test sockets and carriers
– Plasma etch chamber components
– Die attach and wire bonding fixtures
### 2. High-Temperature Heat Treatment
– Furnace support tubes and liners
– Thermocouple protection sheaths
– Sintering boat rollers and guides
– Annealing process fixtures
### 3. Chemical Laboratories
– Clamping cartridges for reactors, test tubes, beakers
– Corrosion-resistant liners for autoclaves
– Sample holders for high-temperature chemical analysis
### 4. Aerospace & Defense
– Rocket nozzle clamping and support rings
– Missile guidance housing insulators
– Propeller component fixtures
– High-temperature sensor enclosures
### 5. Medical Devices
– X-ray tube insulators and supports
– Radiotherapy equipment clamping components
– Biocompatible surgical tool guides
– Laser delivery system fixtures
### 6. Vacuum Electronics
– Feedthrough insulating bushings
– Microwave tube envelope supports
– Electron gun spacer cylinders
– Collector isolation sleeves
### 7. General Industrial
– High-pressure sealing cartridges
– Electrical feedthrough insulators
– Precision alignment bushings
– Wear-resistant guide sleeves
## Why Choose Coraynic Technology?
– **Vertically Integrated Manufacturing:** From BeO powder pressing to precision CNC grinding, metallization, and final inspection.
– **Defense & Aerospace Qualified:** Supplier to military radar, missile guidance, and satellite communication programs.
– **Custom Engineering:** Our ceramic engineers assist with cylinder geometry optimization, tolerance analysis, and brazing interface design.
– **Advanced Quality Control:** 100% inspection – ICP plasma spectrometer, laser particle analyzer, universal tool microscope, surface roughness tester.
– **Process Capability:**
– CNC cylindrical grinding
– Ultrasonic machining
– Laser cutting and drilling
– MoMn metallization + Ni/Au plating
– **Compliance:** RoHS, CE, REACH, ITAR compliant. Full Safety Data Sheet (SDS) and material traceability provided.
> **Contact our engineers:**
> **Email:** sales@coraynic.com
> **Phone:** +86 187 61951906
> **Request a quote:** www.coraynic.com/contactus.html
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**© 2025 Coraynic Technology Limited – Your reliable advanced ceramic material partner.**
*All technical data are based on 99.5% BeO grade at room temperature. Custom specifications welcome. Safety Data Sheet (SDS) available upon request. Beryllium Oxide products are intended for professional industrial use only.*
