Soldering Specialised Flux for Nitinol and Nickel in Military High-Performance Applications

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A specialised flux enables reliable, scalable soldering of Nitinol for advanced defence and aerospace systems.

Miniaturisation, robustness, adaptive functions and maximum reliability are now decisive factors for the performance of defence and aerospace technologies. In this environment, Nitinol, a nickel-titanium alloy with shape memory effect and superelasticity, is becoming increasingly important as a key material for innovative systems. With EO-M-026, Emil Otto offers a specially developed high-performance flux that is precisely tailored to the processing of Nitinol and nickel alloys.

Soldering Nitinol represents one of the greatest challenges in assembly and interconnection technology. The reason is the extremely stable titanium oxide layer that forms immediately upon contact with air and almost completely prevents reliable wetting. Conventional fluxes reach their limits here because they do not sufficiently remove the oxide layer or leave critical residues. The EO-M-026 flux addresses exactly this problem through targeted removal of the titanium oxide layer, activation of difficult-to-wet surfaces, minimisation of corrosive residues and maximum process stability.

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EO-M-026 was specifically developed to meet these requirements. The combination of highly active inorganic activators and complex organic additives enables reliable wetting even on oxidised surfaces, clean processes with minimal residues and high process reliability in automated production environments. The flux is zinc-free and halide-free, non-flammable and VOC-free, making it suitable for modern, safety-critical production environments. By supporting common application methods, from manual processes to selective or laser-based soldering, EO-M-026 can be flexibly integrated into existing production lines.

EO-M-026 therefore provides a specialised flux that makes the processing of Nitinol process-reliable and industrially scalable for the first time. This makes it a decisive enabler for modern military technologies, from UAV systems and adaptive structures to highly sensitive electronic assemblies. The flux thus becomes a critical process component, not merely supportive but functionally indispensable for the production of robust solder joints. In the defence industry in particular, the quality of interconnection technology determines the operational capability of entire systems. Nitinol is used wherever conventional materials reach their limits. Typical military applications therefore include the following areas:

• Adaptive structures and morphing systems: self-adjusting wings or airflow control elements in UAVs and missiles
• Thermally controlled actuators and valves: autonomous control mechanisms in fuel or hydraulic systems
• Vibration and shock damping: protection of sensitive electronics in communication and targeting systems
• Miniaturised microactuators: applications in sensors, optics and wearable equipment
• Space and satellite technology: reliable separation mechanisms without explosive components

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These applications are directly based on the unique material properties of Nitinol, in particular the shape memory effect and superelasticity, which enable mechanical functions without conventional drive systems.

As powerful as Nitinol is, its processing is equally demanding. Even minor deviations in the soldering process can permanently impair its functional properties, such as the shape memory effect. Precise control of thermal processes, adapted solder alloys and precisely matched fluxes are therefore essential. Only through this interaction can it be ensured that the mechanical and functional properties of the material are preserved. This is a fundamental requirement for military systems with long service lives and extreme loads. At a time when performance, reliability and miniaturisation determine technological superiority, interconnection technology therefore plays a key role. EO-M-026 provides the necessary process foundation for this.