Brazed Aluminum Honeycomb Panel

The CHAOEN 4047 Brazed Aluminum Honeycomb Panel is a high-performance lightweight structural composite engineered for the most demanding aerospace, defense, and high-end industrial applications. Unlike conventional adhesive-bonded honeycomb panels, our 4047 panels utilize a vacuum brazing process with 4047 aluminum-silicon (AlSi12) alloy to create a permanent metallurgical bond between the face sheets and the hexagonal honeycomb core. This eliminates all organic adhesives, resulting in a 100% all-metal panel with exceptional peel strength, high-temperature resistance (continuous service up to 400 °C), zero VOC emissions, and indefinite service life without adhesive aging or delamination.

• High-Temperature Performance Continuous service up to 400 °C with zero degradation. The metallurgical brazed bond withstands extreme thermal cycling without delamination - far exceeding the ~150 °C limit of adhesive-bonded panels.
• Superior Peel & Shear Strength The 4047 brazing alloy forms a continuous Al-Si intermetallic layer at the skin-to-core interface, delivering 3–5× higher peel strength (>10 N/mm) compared to adhesive-bonded alternatives (2–4 N/mm).
• Zero Adhesive · Zero VOC 100% all-metal construction. No organic adhesives, no formaldehyde, no volatile organic compounds. Fully compliant with aerospace outgassing standards and indoor air quality regulations.
• Corrosion-Proof The vacuum-brazed joint eliminates moisture ingress paths. Both face sheets and core are aluminum alloy - inherently resistant to corrosion. Optional anodized or PVDF surface treatment for enhanced environmental protection.
• EMI / RFI Shielding The continuous aluminum structure provides excellent electromagnetic interference (EMI) shielding effectiveness (>60 dB across 30 MHz – 1.5 GHz), critical for avionics enclosures and satellite structures.
• Ultra-Lightweight Core density as low as 40 kg/m³. A 15 mm thick panel weighs approximately 5.5–7.0 kg/m² - roughly 1/4 the weight of solid aluminum sheet of equivalent bending stiffness.
• Exceptional Flatness The honeycomb core provides isotropic rigidity, maintaining perfect flatness even in large-format panels up to 2000 × 6000 mm. No warping, no oil-canning.

• Long Service Life No adhesive aging, no embrittlement, no hydrolysis. The all-metal panel maintains its mechanical properties indefinitely under proper operating conditions - 30+ year design life.

Aerospace & Aviation

• Aircraft Fuselage Panels: Lightweight structural panels for commercial and military aircraft fuselage sections, reducing airframe weight and improving fuel efficiency.

• Cabin Floor Panels: High-strength, flat floor panels resistant to foot traffic, impact, and vibration in passenger and cargo aircraft.

• Overhead Storage Bins: Ultra-light bin structures that meet stringent flammability (FAR 25.853) and smoke-toxicity requirements.

• Galley & Lavatory Partitions: Corrosion-proof, easy-to-clean panels for wet areas in aircraft interiors. Zero VOC for cabin air quality.

• Bulkhead & Partition Walls: Rigid, flat divider panels for cabin class separation and privacy partitions.

• Cargo Hold Liners: Impact-resistant, fire-safe lining panels for aircraft cargo compartments.

UAV & Drone Systems

• Airframe Structures: Monocoque and semi-monocoque body panels for fixed-wing and multi-rotor UAVs. Maximizes payload capacity through weight reduction.

• Wing Skins & Spars: High-stiffness, low-weight wing components enabling longer endurance and higher maneuverability.

• Payload Bays & Equipment Trays: EMI-shielded enclosures for sensitive avionics, cameras, and communication equipment.

• VTOL / eVTOL Body Panels: Lightweight structural panels for electric vertical take-off and landing aircraft and urban air mobility vehicles.

Space & Satellite

• Satellite Structural Panels: Honeycomb sandwich panels for satellite body structures, solar array substrates, and antenna reflectors. Low outgassing - suitable for vacuum environments.

• Launch Vehicle Components: Payload fairing panels and interstage structures benefiting from high specific stiffness and thermal stability.

• Optical Benches & Instrument Platforms: Dimensionally stable platforms for precision optical and scientific instruments where thermal expansion must be minimized.

Defense & Military

• Armored Vehicle Interior Panels: Lightweight spall liners and interior cladding for military vehicles. Fire-safe, zero toxic fume emission.

• Mobile Shelter & Command Posts: Rapid-deployment shelter panels combining structural strength, thermal insulation, and EMI shielding.

• Radar & Electronic Enclosures: EMI-shielded enclosures for ground-based and shipboard radar and communication systems.

• Naval Vessel Bulkheads: Corrosion-proof, fire-rated partition panels for naval ship interiors and submarine compartments.

1. Material Preparation

Aluminum alloy sheets (3003/5052/6061) are cut to size and surface-treated. Honeycomb core blocks are expanded from precision-slit aluminum foil and trimmed to specified cell size and density. 4047 brazing alloy foil (AlSi12) is interleaved between the face sheets and honeycomb core.

2. Assembly & Fixturing

The sandwich assembly - face sheet, 4047 brazing foil, honeycomb core, 4047 brazing foil, face sheet - is precisely aligned in a stainless steel vacuum-brazing fixture. The fixture applies uniform pressure across the entire panel surface to ensure consistent contact during the brazing cycle.

3. Vacuum Brazing

The fixtured assembly is placed in a high-vacuum furnace (< 5 × 10⁻⁴ Pa). The temperature is ramped to 580–610 °C, above the solidus of the 4047 alloy (~577 °C) but below the melting point of the base aluminum alloys. The 4047 alloy melts, wets the aluminum surfaces through capillary action, and forms a continuous metallurgical bond at every cell wall junction.

4. Controlled Cooling

The panel is cooled at a controlled rate under vacuum to prevent thermal distortion and ensure uniform microstructure in the brazed joints. Post-braze, the panel exhibits a continuous Al-Si intermetallic layer at all skin-to-core interfaces.

5. Inspection & Quality Control

Each panel undergoes: visual inspection for surface defects; ultrasonic C-scan or X-ray inspection for bond integrity verification; dimensional check for thickness, flatness, and edge quality; mechanical testing (peel strength per ASTM D1781, flatwise tensile per ASTM C297) on witness coupons from the same brazing batch. NADCAP / AS9100 certification available for aerospace-grade production.

6. Surface Finishing

Post-braze surface treatment per customer specification: anodizing (Type II or Type III hard anodize), chromate conversion coating (MIL-DTL-5541), PVDF or powder coating, or brushed/mirror polish finish. All surface treatments are applied after brazing to ensure coating integrity over the metallurgical bond.

7. Final Packaging & Delivery

Each panel is protected with PE film, separated by foam interleaving, and packed in ISPM 15 compliant plywood crates for domestic or international shipment. Full material certifications, inspection reports, and compliance documentation accompany every order.

✓ NADCAP-certified vacuum brazing (available for aerospace orders)

✓ AS9100D Quality Management System (available for aerospace orders)

✓ ISO 9001:2015 certified manufacturing facility

✓ Mechanical testing per ASTM D1781, ASTM C297, ASTM C393, ASTM E8

✓ Non-destructive testing: Ultrasonic C-Scan, X-ray, dye penetrant inspection

✓ Fire testing per EN 13501-1, ASTM E84, GB 8624

✓ EMI shielding effectiveness per MIL-STD-285 / IEEE 299

✓ Outgassing per ASTM E595 (for space applications)

✓ Full material traceability from mill certificate to finished panel

✓ Certificate of Conformance (CoC) with each shipment

We recommend certified installers for structural and facade projects. Technical installation drawings, load tables, and on-site support are available.

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