Copper-aluminum composite 75-75

Copper-aluminum composite radiators are heat dissipation devices that combine copper and aluminum materials through a specialized manufacturing process. Leveraging the "corrosion resistance of copper combined with the high-efficiency heat dissipation of aluminum," they are widely used in home heating systems, high-end buildings, and environments with complex water quality. Below is a detailed analysis covering their structural principles, performance advantages, and application scenarios.

Material and Structural Design

● Core Material Combination

Internal waterway (copper): Made from TP2 oxygen-free copper (copper content ≥99.9%), it boasts a high thermal conductivity (approximately 398 W/m·K) and excellent corrosion resistance, making it particularly well-suited for challenging water conditions—such as heating water containing chloride ions or dissolved oxygen.

External heat sink (aluminum): Made from 6063-T5 aluminum alloy, it features low density (2.7 g/cm³), a large散热 area (achieved through an extrusion process that forms a fin structure), and a thermal conductivity of approximately 205 W/m·K, effectively accelerating heat dissipation.

● Connection Process

Expansion tube process: Hydraulic or mechanical expansion is used to tightly fit the copper tube with the aluminum profile, eliminating any gaps and ensuring efficient heat transfer (with contact thermal resistance approaching zero).

Welding Process: Some high-end products utilize copper-aluminum brazing (such as high-frequency brazing) to enhance bonding strength and prevent tube detachment and water leakage.