Folded Skived Fins for Microchannel Cold Plates: 0.08–0.3mm Thickness, Fin Pitch & Substrate Selection (AL1060/AL3003/C1100/C1020)
With the rapid development of high-power electronics such as AI servers, new energy vehicle powertrains, and laser equipment, the demand for efficient thermal management solutions in microchannel cold plates is increasing dramatically.
For skived microchannel cold plates, in addition to the commonly used straight skived fins, folded skived fins have become a more efficient heat transfer solution due to their unique structural advantages. Unlike straight skived fins, folded skived fins are formed by precision CNC skiving and synchronous folding from a single substrate, forming a continuous, high-density folded structure that significantly enhances heat transfer efficiency.
This article focuses on folded skived fins applied in microchannel cold plates, focusing on the 0.08–0.3mm fin thickness and fin pitch range, substrate material selection (AL1060, AL3003, C1100, C1020), and its core advantages and practical applications, providing professional technical guidance for engineers, purchasers, and industry practitioners.
1. What are Folded Skived Fins for Microchannel Cold Plates?
Folded skived fins, a upgraded type of skived fin technology, are high-density fin structures formed by precision CNC skiving from a single piece of metal substrate, followed by synchronous folding (90° or customized angle) to form a continuous folded or corrugated shape. Different from straight skived fins that are flat and straight, folded skived fins have a staggered or wavy folded structure, which can better disturb the flow of cooling liquid and enhance heat transfer performance.
For microchannel cold plates, folded skived fins are directly skived and folded on the lower plate of the cold plate, and the gaps between the folded fins naturally form uniform microchannels. After sealing with the upper cover plate through vacuum brazing or diffusion welding, a sealed microchannel cold plate with high heat transfer efficiency is formed. The 0.08–0.3mm fin thickness and fin pitch range is the most widely used in mass production, which balances heat transfer performance, structural strength, and processing feasibility, and is the core choice for high-efficiency microchannel cold plate design.
2. Key Specifications of Folded Skived Fins for Microchannel Cold Plates
The performance of folded skived fins is directly determined by their structural parameters, among which fin thickness, fin pitch, fin height, and substrate material are the core factors. The following are the standard mass-produced specifications for folded skived fins applied in microchannel cold plates, with fin thickness and fin pitch both in the 0.08–0.3mm range:
- Fin Thickness: 0.08mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm (mass-produced mainstream range)
- Fin Pitch: 0.08mm – 0.3mm (consistent with fin thickness, optimized for microchannel fluid flow and high-density folded fin arrangement)
- Fin Height: 1.0mm – 5.0mm (commonly 1.5mm – 3.0mm for microchannel cold plates)
3. Substrate Material Selection: AL1060, AL3003, C1100, C1020
The substrate material of folded skived fins directly affects the heat transfer efficiency, structural strength, corrosion resistance, and cost of microchannel cold plates. According to practical application scenarios and performance requirements, the mainstream substrate materials are AL1060, AL3003, C1100, and C1020.
4. Core Advantages of Folded Skived Fins (Compared with Straight Skived Fins)
Folded skived fins have obvious advantages over traditional straight skived fins in microchannel cold plate applications, especially with the 0.08–0.3mm ultra-thin fin thickness and fin pitch design, which can better meet the high heat flux heat dissipation needs:
4.1 Higher Heat Transfer Efficiency
The folded structure of folded skived fins can strongly disturb the cooling liquid flowing through the microchannels, continuously tear and thin the thermal boundary layer, and the heat transfer coefficient is 30–50% higher than that of straight skived fins. The 0.08–0.3mm ultra-thin and high-density design further increases the heat transfer area, making the heat dissipation efficiency more excellent.
4.2 Better Fluid Turbulence and Uniform Flow
The staggered or wavy folded structure forms a “maze-like” microchannel, which makes the cooling liquid form stable turbulence (Re=500–3000) in the channel, avoiding the dead zone of fluid flow, ensuring uniform flow of cooling liquid, and improving the temperature uniformity of the cold plate (chip temperature difference ≤ 2–4℃).
4.3 Higher Structural Strength and Stability
After folding, the folded skived fins form a mutually supported structure, which has higher structural rigidity and vibration resistance than straight skived fins. The integrally skived and folded structure has no fin detachment or virtual welding problems, and can adapt to harsh working conditions such as automotive vibration and industrial outdoor environment.
4.4 Flexible Customization, No Mold Required
The fin thickness (0.08–0.3mm), fin pitch, fin height, and folding angle of folded skived fins can be directly adjusted through CNC programming, without the need for mold opening. This greatly reduces the cost and lead time of small-batch samples and customized products, and can quickly adapt to the design requirements of various special-shaped microchannel cold plates.
5. Application Scenarios of Folded Skived Fin Microchannel Cold Plates
Based on the advantages of high heat transfer efficiency, good fluidity, and flexible material selection, folded skived fin microchannel cold plates are widely used in various high heat flux fields. The following are typical application scenarios corresponding to different substrate materials and fin thicknesses:
5.1 AI Servers and HPC
AI GPUs and HPC servers have high power consumption (250–700W per chip) and high heat flux density (100–300 W/cm²). C1100 or C1020 copper folded skived fins with 0.08–0.2mm thickness and pitch are usually used, which can achieve thermal resistance as low as 0.06–0.15℃/W and ensure stable operation of the equipment.
5.2 New Energy Vehicles
Automotive-grade microchannel cold plates need to adapt to harsh conditions such as -40℃~125℃ temperature range and strong vibration. AL3003 aluminum folded skived fins with 0.15–0.3mm thickness and pitch are preferred, which have high structural strength and corrosion resistance. They are widely used in powertrains, OBC, DC-DC converters, and battery packs, reducing the volume of the cooling system by 40–60% and the weight by 30–50%.
5.3 Laser and Semiconductor Equipment
Solid-state lasers, SiC/GaN power devices, and other equipment have ultra-high heat flux density (150–400 W/cm²). C1100 copper folded skived fins with 0.08–0.15mm thickness and pitch are used to achieve efficient heat dissipation, ensuring the stability and service life of the equipment.
5.4 Military, Aerospace and Medical Equipment
High-end equipment such as military and aerospace requires high reliability and long service life. C1020 oxygen-free copper folded skived fins with 0.08–0.15mm thickness and pitch are selected, which have no hydrogen embrittlement risk and excellent brazing performance, meeting the strict requirements of high-precision thermal management.
Why Choose a Professional Skived Heat Sink Manufacturer
Selecting an experienced skived heat sink manufacturer is essential for achieving the best thermal performance.
A professional manufacturer provides:
custom thermal design support
precision skiving technology
strict quality inspection
customized manufacturing solutions
Companies such as BY Thermal offer customized skived heat sinks designed to meet specific thermal requirements. We are the only factory in China that both manufactures and sells skiving machine equipment and provides customized services for skiving heat sinks. With a decade of experience in the skiving heat sink business, we are fully capable of producing the most popular high-standard skiving heat sinks.