How Chemical Etching Helps Unlock the Future of Direct-to-Chip Cooling

Modern AI accelerators can dissipate several hundred watts, with next-generation devices expected to exceed current thermal limits. To manage these heat loads, direct-to-chip cooling places liquid-cooled cold plates directly on the processor package, dramatically improving heat removal compared to conventional air-cooled heat sinks.

The effectiveness of these systems depends heavily on the internal architecture of the cold plate. Small improvements in channel design, fluid distribution, and heat transfer surface area can significantly enhance cooling performance. As a result, manufacturers require production technologies capable of producing increasingly intricate flow features at high precision.

Why Chemical Etching Is Well Suited to Thermal Management Components

Chemical etching, also known as photochemical machining (PCM), is a subtractive manufacturing process that selectively removes metal using photo-defined masks and chemical etchants. Unlike traditional machining methods, the process introduces no mechanical stress or heat-affected zones, producing burr-free, highly accurate components.

For direct-to-chip cooling applications, this offers several distinct benefits:

Precision Microchannels

One of the primary advantages of chemical etching is its ability to create fine, intricate metal flow channels. Tecan specifically highlights the use of etched, high-aspect-ratio channel structures for liquid cooling assemblies used in servers and high-performance computing systems.

These microchannels:

• Increase coolant contact area
• Promote more efficient heat transfer
• Improve temperature uniformity
• Reduce processor hot spots

By enabling coolant to flow closer to the heat source through optimized pathways, etched channel structures can significantly improve cooling efficiency.

Greater Design Freedom

Traditional machining methods can impose limitations on channel geometry, collector design, and manifold layouts. Chemical etching removes many of these constraints by allowing engineers to create highly complex designs without expensive tooling changes.

Features can include:

• Curved flow paths
• Integrated headers and collectors
• Variable-width channels
• High-density flow networks
• Fine structures down to approximately 20 μm feature size

This flexibility enables thermal engineers to optimize coolant distribution for specific chip architectures and heat profiles.

Driving Heat Transfer Performance

Beyond simply transporting coolant, cooling channels must maximize thermal exchange between the liquid and the metal structure.

Tecan’s chemical etching technology allows incorporation of internal features such as pillars and standoffs that intentionally generate flow disturbance and turbulence within the coolant. These structures help disrupt thermal boundary layers and improve heat transfer efficiency.

The result is:

• Higher heat transfer coefficients
• Better thermal performance
• More compact cooling solutions
• Increased cooling capacity for AI and HPC workloads

As data centres continue to increase rack power densities, these performance gains become increasingly valuable.

Many next-generation thermal management solutions rely on stacked or bonded structures that combine multiple etched layers into a single cooling assembly.

Chemical etching can efficiently produce large volumes of channel plates that are subsequently bonded to form highly complex three-dimensional cooling structures and heat exchangers.

This capability supports development of:

• Microchannel cold plates
• Compact heat exchangers
• High-performance coolant manifolds
• Advanced liquid cooling modules

These architectures are increasingly important as the industry moves toward higher heat flux processors and more demanding AI infrastructure

Another advantage of chemical etching is its compatibility with a wide range of engineering materials, including stainless steel, copper, nickel alloys, and corrosion-resistant metals commonly used in thermal management applications.

This flexibility allows designers to optimize performance based on:

• Thermal conductivity
• Corrosion resistance
• Mechanical strength
• Coolant compatibility
• Pressure requirements

The ability to select the most suitable material without sacrificing design complexity provides a powerful advantage when developing next-generation cooling systems.

As processor power continues to rise, the demand for more sophisticated cooling technologies will only increase. Direct-to-chip liquid cooling is rapidly becoming a critical enabler of AI, cloud computing, and high-performance computing infrastructure.

Chemical etching from Tecan provides manufacturers with a highly proficient solution for producing the precision microchannel structures needed to support these systems. Through design freedom, micro-scale accuracy, material flexibility, and scalable production, etched cooling components can help data centre operators achieve greater thermal efficiency while supporting future performance growth.

For organisations developing the next generation of thermal management solutions, chemical etching is proving to be much more than a manufacturing process. It is becoming a key technology in the evolution of direct-to-chip cooling.