Where Rheocasting opens New Markets

If foundries want to stop competing only on price, they need to sell properties that others cannot easily reproduce.

Rheocasting creates exactly that opportunity. It does not replace conventional HPDC, but it expands what can be produced on a die-casting machine. This becomes especially interesting when the customer needs something that conventional HPDC struggles to deliver, and these are also exactly the properties that open the door to new markets.

Humanoid Robots need Lightweight Structures

Humanoid robots could become one of the most interesting new markets for die casting. A robot requires numerous structural components around the shoulders, arms, hips, and legs. The potential is around 20 to 50 die-cast components per robot. More importantly, many of these parts fit into the machine sizes already installed in typical foundries rather than requiring another race towards larger casting machines.

Weight is critical. Every additional kilogram has to be accelerated, stopped, and carried around during operation. More weight ultimately means either less operating time or a larger battery.

This creates an interesting application for alloys such as A319 (AlSi6Cu3FeZnMn). Rheocasting can produce complex structural components with wall thicknesses around 1 mm while maintaining more uniform mechanical properties throughout the casting.

That consistency matters when engineers start biomechanically optimizing structures. A simulation can only remove material if the designer can rely on the required properties being available throughout the component.

The same logic applies to drones and UAVs. They need lightweight structures, thin walls and high stiffness, while every kilogram saved increases payload or flight time.

The opportunity for the foundry is therefore not simply to quote another aluminium part. Many robotics companies originate from software, electronics or sensor technology and have limited casting experience. They need someone who can help industrialize the mechanical structure.

Thermal Management is becoming a Casting Opportunity

The second major property is thermal conductivity. 5G and 6G infrastructure has already shown what is possible. Low-silicon alloys achieve thermal conductivity up to 198 W/mK while still producing highly complex geometries. The fins exceeding 100 mm in height with 1 mm thickness at the top have already been produced in series production.

That combination is difficult because conventional HPDC relies on high silicon contents for castability, which is needed for the complex geometries. Unfortunately, the same alloying strategy reduces thermal conductivity.

Rheocasting changes this compromise. Castability isn´t dependent on silicon because the thixotropic slurry provides very long flow lengths even with low-silicon alloys.

The next opportunity is AI infrastructure. Modern GPU servers generate enormous amounts of heat, and liquid cooling is becoming increasingly important. Current cooling solutions often consist of machined blocks, tubes, plates, and several joined components. This creates an opportunity to integrate more of that system into one casting. Structures with wall sections down to around 0.4 mm show what Rheocasting can achieve.

And suddenly the foundry is no longer competing against another foundry quoting the same drawing. It is competing against machining, extrusion, and assembled cooling systems.

Leak Tightness becomes the Product

Another property that customers are willing to pay well for is leak tightness. CO₂ compressor housings are an extreme example. These components can require helium tightness at pressures around 160 to 180 bar.

The challenge for conventional HPDC is not necessarily the strength of aluminium. It is the defects created during turbulent filling and high wall thicknesses. Entrapped gas and micro-porosity create continuous leakage paths through the casting.

The laminar filling behaviour of Rheocasting prevents these defects. Projects for CO₂ compressor systems have already demonstrated the potential. The commercial message therefore changes completely. You are not selling a housing. You are selling helium tightness at 180 bar without impregnation.

Battery systems create a similar opportunity. Large housings combine long flow lengths with demanding leakage requirements and welding. Porosity close to the weld becomes a serious problem. A low-porosity microstructure improves weldability and reduces the risk of creating leakage paths during joining.

And the cost of failure is no longer the price of one casting. If the leakage is discovered after the complete battery has been assembled, the financial impact becomes significantly larger. The property being sold is therefore the reliability of the complete assembly.

Lightweight Structural Parts come from Other Processes

The fourth opportunity is closer to the traditional foundry industry. Commercial vehicles contain many structural components that are still produced in grey iron, or in aluminium permanent mould casting. These processes were selected because of fatigue requirements and wall thickness that conventional HPDC struggles to fulfil.

Electrification makes weight increasingly important. Heavy batteries reduce either payload or vehicle range, creating additional pressure to lightweight the chassis. Rheocasting creates a route to move some of these components onto high-pressure die-casting machines. A356-type alloys are particularly interesting because they are already widely specified for structural gravity and sand castings. Rheocasting makes it possible to cast these alloys while combining them with the productivity of a high-pressure die-casting machine.

That means the customer doesn´t even need to change the alloy. Instead, the foundry can look at an existing permanent-mould or sand-cast component and ask whether it can deliver the same required fatigue properties at lower weight and significantly higher productivity.

Even very thick sections become possible. The presentation shows an example with an 86 mm wall section to demonstrate that the application range can extend far beyond what would normally be considered suitable for HPDC. This is important because the foundry is no longer fighting for another existing HPDC order. It is taking business from another manufacturing process.

Sell the Solution

Humanoid companies need lightweight structures. AI infrastructure needs thermal management. Compressor manufacturers need extreme leak tightness. Truck manufacturers need lower weight without sacrificing fatigue performance.

None of these customers are primarily looking for Rheocasting. They are looking for a solution to an engineering problem. That is the important shift for foundries.

Do not start the discussion with the casting process or the machine available on the shop floor. Start with the property the customer needs. Then develop the alloy, component, and production process required to deliver that property reliably at scale.

That is much harder for a cheaper competitor to copy. And that is where a casting stops being a commodity.