Alumina Ceramic Screw Fasteners

Alumina Ceramic Screw Fasteners

12 month ago

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Shaanxi Puwei Electronic Technology Co., Ltd

 2 year year

Product details

Alumina Ceramic Screw Fasteners: The High-Performance, Non-Metallic Fastening Solution

Puwei's Alumina Ceramic Screw Fasteners are engineered to outperform traditional metal fasteners in the most demanding applications. Manufactured from high-purity aluminum oxide (Al₂O₃), these fasteners combine exceptional temperature resistance, outstanding chemical inertness, excellent electrical insulation, and high mechanical strength in a lightweight, non-magnetic package. They are the ideal choice for industries where extreme environments, corrosion, electrical isolation, or weight reduction are critical design constraints, serving as reliable and durable CERAMIC COMPONENTS in complex assemblies.

Why Choose Alumina Ceramic Fasteners?

Extreme Temperature & Thermal Shock Resistance (Up to 1650°C): Maintain mechanical integrity and clamping force in high-temperature furnaces, engine compartments, and aerospace environments where metals would soften or fail.
Superior Corrosion & Chemical Resistance: Inert to a vast range of acids, alkalis, solvents, and salts. Ideal for chemical processing, marine, and semiconductor equipment, eliminating the risk of galvanic corrosion and contamination.
Excellent Electrical Insulation & Non-Magnetic Properties: Provide perfect electrical isolation, preventing eddy currents and short circuits. Essential for securing components in high-frequency modules, MRI equipment, and sensitive microelectronics where magnetic interference is unacceptable.
High Hardness & Exceptional Wear Resistance: Hardness exceeding 80 HRA ensures minimal thread wear and galling, even in high-vibration or abrasive environments, leading to a longer service life and reliable, maintenance-free operation.
Lightweight & High Strength-to-Weight Ratio: Significantly lighter than steel (density ~3.9 g/cm³), contributing to overall weight reduction in aerospace, automotive, and portable electronics without compromising strength.
Biocompatible & Chemically Inert: Suitable for medical and food-processing equipment, where material purity, non-toxicity, and ease of sterilization are paramount.

Various sizes and types of Alumina Ceramic Screws, Bolts, and Nuts from Puwei

Close-up of precision-machined Alumina Ceramic Fastener threads and head

Technical Specifications & Material Properties

Puwei's ceramic fasteners are available in multiple alumina purity grades to suit performance and budget requirements. Standard specifications for 99.5% Al₂O₃ are listed below.

Material & Physical Properties

Material: High-Purity Aluminum Oxide (Al₂O₃), 96%, 99.5%, or 99.8% purity.
Color: White / Ivory
Density: 3.7 – 3.9 g/cm³
Water Absorption: 0% (Fully Dense)

Mechanical Properties

Hardness (Rockwell A): 80 – 90 HRA (≈ 1500-1700 HV)
Flexural Strength: 300 – 400 MPa
Compressive Strength: > 2000 MPa
Young's Modulus (Elasticity): 300 – 380 GPa
Fracture Toughness (K1C): 3.5 – 4.5 MPa·m¹/²

Thermal & Electrical Properties

Maximum Continuous Use Temperature: 1500°C – 1650°C
Thermal Conductivity: 20 – 30 W/(m·K)
Coefficient of Thermal Expansion (CTE): 6.5 – 7.5 x 10⁻⁶/°C (20-800°C)
Volume Resistivity: > 10¹⁴ Ω·cm @ 25°C
Dielectric Strength: > 15 kV/mm
Dielectric Constant (εr): ~9.5 @ 1 MHz

Chemical Resistance

Excellent resistance to most acids, alkalis, and organic solvents. Not recommended for use with hydrofluoric acid (HF) and hot concentrated phosphoric acid.

Design for Assembly & Installation Best Practices

Ceramic fasteners have different design and handling requirements compared to metals. Following these guidelines ensures optimal performance and prevents damage.

Design Considerations

Understand Material Behavior: Ceramics are hard and strong in compression but have lower tensile strength and fracture toughness than metals. Design to avoid bending, shearing, or point-impact loads.
Avoid Stress Concentration: Use generous fillets and avoid sharp corners in mating parts. Ensure bearing surfaces are flat and parallel to distribute load evenly.
Account for Thermal Expansion: The CTE of alumina (~7 ppm/°C) differs from metals (e.g., steel ~11 ppm/°C). In high-temperature applications, design clearances or use compliant washers to accommodate differential expansion.
Torque Specifications: Always use a torque wrench. Do not exceed recommended torque values. Ceramic threads are strong but can be damaged by over-tightening. Use a lower torque than for equivalent steel fasteners and rely on thread-locking compounds if necessary.

Installation Procedure

Inspection: Visually inspect fasteners for any chips or cracks before installation.
Thread Preparation: Ensure mating threads (in metal or ceramic) are clean, deburred, and properly aligned. It is recommended to use a thread lubricant compatible with the application (e.g., high-temperature anti-seize) to reduce friction and prevent galling.
Handling & Tooling:
- Use tools with soft jaws or insert pads to prevent marring the ceramic surface.
- Never use impact drivers.
- Apply torque steadily and evenly. Do not jerk or apply sudden force.
Final Check: After tightening, do not attempt to further adjust or re-torque excessively, as this may compromise the fastener's integrity.

Primary Application Scenarios

1. Semiconductor & Vacuum Equipment

Used in wafer processing, CVD, PVD, and etching chambers where high purity, non-contaminating, and non-outgassing materials are required. They secure critical insulation elements and shields within the vacuum environment.

2. High-Temperature Furnaces & Thermal Processing

Ideal for assembling furnace elements, insulating bricks, and heating element supports in kilns, sintering furnaces, and heat treatment equipment, where they withstand oxidation and thermal cycling better than metal alloys.

3. Electrical & Power Electronics

Secure busbars, heatsinks, and components in high-voltage and power devices, providing excellent electrical isolation and eliminating the risk of short circuits. Also used in thermoelectric cooling assemblies.

4. Chemical & Petrochemical Processing

Employed in pumps, valves, reactors, and pipe flanges handling corrosive media. Their chemical inertness ensures long-term reliability in aggressive environments where stainless steel would corrode.

5. Aerospace & Defense

Used in avionics enclosures, sensor mounts, and engine components where lightweight, non-magnetic, and high-temperature properties are critical for performance and safety.

6. Medical & Analytical Instrumentation

Found in MRI machines, CT scanners, mass spectrometers, and surgical tools where non-magnetic and electrically insulating fasteners are essential to prevent interference and ensure patient safety.

7. Automotive & New Energy

Applicable in electric vehicle battery packs, power electronics, and sensors where electrical isolation and resistance to under-hood temperatures and chemicals are beneficial.

Customization & OEM/ODM Services

Puwei specializes in manufacturing custom ceramic fasteners to meet your exact dimensional, performance, and application-specific requirements.

Our Customization Capabilities Include:

Full Range of Fastener Types: Machine screws, socket head cap screws, set screws, nuts, washers, studs, and custom-designed fasteners.
Precision Dimensions: Custom diameters (M2 to M20 and beyond), lengths, thread pitches (metric, UN, Whitworth), and head styles.
Material Grades: 96% Al₂O₃ for cost-effective chemical/thermal applications, 99.5% Al₂O₃ for superior mechanical and electrical properties, 99.8% Al₂O₃ for ultra-high purity needs.
Tolerances: Manufactured to ISO or DIN standards, with tighter tolerances available upon request.
Secondary Processing: Special surface finishes, chamfering, and marking (laser engraving) for traceability.
Integrated Solutions: Can be supplied alongside other Puwei products like Alumina Ceramic Substrate (Al2O3) plates or complex CERAMIC COMPONENTS for complete subsystem assembly.

Manufacturing Process & Quality Assurance

Our advanced manufacturing process ensures high dimensional accuracy, consistency, and reliability for every batch of fasteners.

Powder Preparation: High-purity alumina powder is selected and mixed with precise sintering aids.
Forming: Fastener blanks are formed using advanced isostatic pressing, which ensures uniform density and minimal defects, crucial for mechanical strength.
Pre-Sintering Machining (Green Machining): In some cases, threads and precise features are machined into the "green" (unfired) compact with specialized tooling.
High-Temperature Sintering: The formed parts are sintered at temperatures exceeding 1600°C in controlled atmosphere kilns, achieving near-theoretical density and final hardness.
Precision Diamond Grinding: Critical dimensions, threads (if not green-machined), and surface finishes are achieved using diamond grinding wheels on CNC equipment. This step guarantees tight tolerances and smooth threads.
Rigorous Quality Inspection:
- 100% visual inspection for surface defects.
- Dimensional verification using optical comparators, thread gauges, and CMMs.
- Sample testing for hardness, density, and other key properties.

Certifications, Compliance & Quality Management

Puwei Ceramic adheres to international quality standards, ensuring our products meet the stringent requirements of global industries.

Quality Management System: ISO 9001:2015 Certified manufacturing and quality control processes.
Material Compliance: All materials are compliant with RoHS and REACH directives. Alumina ceramic is inherently non-toxic and safe.
Traceability: Full batch traceability from raw material to finished goods is maintained.
Process Control: Statistical Process Control (SPC) is implemented for critical dimensions to ensure consistency.

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Shaanxi Puwei Electronic Technology Co., Ltd

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2 year

Address: Xian, China

Main Product: Alumina Ceramic Substrates, Aluminum Nitride Substrates, Metallized Ceramics, AlN Ceramics Disc , DPC Substrate, DBC Ceramic Substrate

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