Bonded fin liquid cold plates are high-efficiency thermal management components engineered for high-heat-flux electronics where standard extruded designs cannot meet thermal budgets. By mechanically locking or vacuum-brazing high-aspect-ratio metal fins into precision-machined base plates, these cold plates maximize internal fluid surface area while minimizing thermal resistance.
Designed for tier-1 power electronics, data centers, and electric vehicle (EV) platforms, they provide reliable heat dissipation for high-power semiconductor modules, laser diodes, and high-density computing infrastructure.
Technical Specifications
|
Parameter |
Standard Specification / Range |
|
Base Material |
Aluminum (6061-T6, 6063-T5), Copper (C11000) |
|
Fin Material |
Aluminum (1100, 3003), Copper |
|
Fin Thickness |
0.2 mm to 0.8 mm |
|
Fin Density |
8 FPI to 24 FPI (Fins Per Inch) |
|
Base Plate Thickness |
6 mm to 30 mm (Customizable) |
|
Max Operating Pressure |
Up to 1.0 MPa (150 psi) proof tested |
|
Coolant Compatibility |
Water-Glycol (50/50), Deionized Water, Mineral Oil, Dielectric Fluids (PAO, Fluorinerts) |
|
Surface Treatment |
Chem film (MIL-DTL-5541), Nickel Plating, Anodizing |
Key Features
High Fin Density:
Delivers greater surface area per unit volume than traditional extrusions, significantly reducing junction-to-fluid thermal resistance.
Matched Thermal Expansion:
Single-material builds (all-aluminum or all-copper) eliminate thermal stress and joint fatigue across wide temperature cycles.
Leak-Free Joint Integrity:
Fabricated via high-temperature controlled atmosphere brazing or high-integrity mechanical bonding to ensure fluid containment under continuous vibration.
Optimized Pressure Drop:
Custom internal flow paths balance high heat transfer coefficients against system pump capacity limits.
Materials & Options
Base Plates:
• Aluminum 6061-T6: High structural strength and light weight; standard for industrial power electronics.
• Copper C11000: Superior thermal conductivity (391 W/m·K) for extreme heat-flux densities.
Bonding Methods:
• Vacuum Brazing: Creates a metallurgical bond with zero thermal interface barrier; essential for high-reliability systems.
• Mechanical Bonding / Fin Insertion: Cost-effective for moderate heat loads that do not require high-temperature furnace processing.
• Fin Profiles: Plain, louvered, or offset strip fins designed to induce turbulent coolant flow at lower Reynolds numbers.
Manufacturing Process
CNC Milling: Base plates are precision-machined on multi-axis CNC centers to maintain tight flatness tolerances across mounting pads.
Fin Stamping & Forming: High-speed tooling forms uniform fin geometries with clean edges and zero flow blockage.
Controlled Atmosphere Brazing (CAB): Aluminum assemblies are processed in nitrogen-purged vacuum furnaces to achieve uniform braze joint wetting.
Port Integration: O-ring boss ports, NPT threads, or direct tube stubs are joined using TIG or laser welding.
Quality Control
Helium Leak Testing: 100% mass spectrometer leak testing down to 1 × 10⁻⁹ Pa·m³/s prior to final packaging.
Pressure Proof Testing: Hydrostatically tested at 1.5 × maximum working pressure.
Dimensional Inspection: CMM verification of mounting hole patterns, port coordinates, and overall envelope profiles.
Surface Flatness Verification: Laser interferometry and dial indicators inspect semiconductor mounting pads to ensure Ra ≤ 1.6 μm and flatness within 0.05 mm.
Customization
Computational Fluid Dynamics (CFD) modeling optimizes internal pressure drop and eliminates localized thermal hot spots.
Custom mounting patterns for IGBTs, MOSFETs, and insulated metal substrates (IMS).
Rapid sample turnaround for engineering validation tests (EVT) and prototype evaluations.
Applications
Electric Vehicle (EV) Powertrains: Traction inverters, motor controllers, and onboard high-power battery chargers.
Data Centers & Servers: Liquid-cooled server blades, high-performance computing (HPC) CPUs, and GPU arrays.
Renewable Energy: Utility-scale solar PV inverters and wind turbine frequency converters.
Industrial Equipment: High-power fiber lasers, medical MRI gradient amplifiers, and semiconductor manufacturing tools.
Packaging & Delivery
Packaging: Cleanroom-compatible sealed polyethylene bags with active desiccant; custom anti-static, shock-absorbent corrugated crating for international transit.
Port Protection: Threaded plastic protective plugs installed on all fluid inlets and outlets to prevent particulate contamination during shipping.
Lead Time: Prototyping completed in 3 to 4 weeks; production delivery schedules structured to match rolling customer forecasts.
FAQ
Q: What is the primary advantage of bonded fin cold plates over extruded cold plates?
A: Extruded cold plates are limited by extrusion die ratios, which restrict fin thinness and height. Bonded fin designs allow for much thinner, denser fins with high aspect ratios, drastically increasing internal surface area and lowering thermal resistance.
Q: What coolants are compatible with these cold plates?
A: Standard configurations are designed for water-glycol mixtures and deionized water. For applications requiring dielectric fluids (such as immersion-cooled data centers or specialized avionics), passivated aluminum or all-copper builds are utilized.
Q: How do you prevent galvanic corrosion in mixed-metal systems?
A: If copper and aluminum components share a single coolant loop, we apply protective chemical conversion coatings (such as nickel plating on copper or MIL-DTL-5541 passivation on aluminum) and specify appropriate corrosion inhibitors in the fluid mix.
Q: What is the typical maximum operating pressure limit?
A: Standard production cold plates are proof-tested to 1.0 MPa (150 psi) and recommended for continuous operating pressures up to 0.6 MPa (90 psi). Higher-pressure ratings can be engineered upon review of mechanical constraints.
Q: What tolerances can be achieved on semiconductor mounting surfaces?
A: Mounting pad flatness is maintained within 0.05 mm (0.002 inch) with a surface roughness of Ra ≤ 1.6 μm to minimize thermal interface material (TIM) bond-line thickness.
Q: What file formats are required for custom design inquiries?
A: We accept STEP, IGES, SolidWorks, and PDF engineering drawings, accompanied by thermal boundary conditions (total heat dissipation in watts, coolant type, flow rate, inlet temperature, and allowable pressure drop).
Request a Quote
Submit your thermal specifications, 3D CAD models, or operational parameters for a technical review and formal commercial proposal.
Hot Tags: bonded fin liquid cold plates, China bonded fin liquid cold plates manufacturers, suppliers, factory