Unlocking High Performance: Why Do Titanium Alloy Screws Need DLC Surface Treatment?

In high-demand industries such as aerospace, medical devices, high-end automobiles and precision electronics, titanium alloy screws are highly favored for their high strength, lightweight and excellent corrosion resistance. However, titanium alloys have a fatal weakness - they have a relatively high coefficient of friction themselves and are prone to the phenomenon of "Galling/Cold Welding". 

When two titanium metal components are tightened, due to the surface adhesion tendency, the threads are prone to seizing during the tightening process, resulting in assembly failure or inability to disassemble. To overcome this technical pain point, DLC (Diamond-Like Carbon) coating has become the "gold standard" for titanium alloy fasteners.

Why can titanium alloy screws undergo DLC treatment? 

1.Completely eradicate the "Anti-Galling" phenomenon 

Due to the nature of the oxide layer on the surface of titanium alloys, cold welding is prone to occur when they are tightened under pressure. The DLC coating has an extremely low coefficient of friction (typically 0.1-0.15), acting as a "solid lubricant". It can effectively prevent direct contact between metals, ensuring that the screws remain smooth during multiple disassemblies nd reassemblies, and avoiding catastrophic jamming.

2. Significantly enhance surface hardness and wear resistance 

Although the titanium alloy matrix has high strength, its surface wear resistance is relatively poor. The DLC coating has an extremely high hardness (Hv 2000-4000), which can protect the surface of the screw like armor, preventing scratches, wear and fretting wear that occur during assembly.

3. Enhance corrosion resistance and chemical stability 

DLC coating not only has excellent chemical inertness, but also has a dense structure, which can effectively prevent corrosive media (such as salt spray and acidic liquids) from coming into contact with the substrate. This enables titanium alloy screws to maintain long-term structural integrity even in extremely harsh environments. 

4. Optimize the torque consistency during the assembly process 

Torque stability is of vital importance in automated assembly lines. Due to the DLC coating reducing frictional resistance, the torque factor (K-factor) during the fastening process becomes more stable and predictable. This means that engineers can obtain more precise preload, which greatly enhances the assembly quality and safety of the entire machine. 

When two titanium metal components are tightened, due to the surface adhesion tendency, the threads are prone to seizing during the tightening process, resulting in assembly failure or inability to disassemble. To overcome this technical pain point, DLC (Diamond-Like Carbon) coating has become the "gold standard" for titanium alloy fasteners.

If you are currently facing 

1.The problem of unstable assembly torque for precision structural components; 

2.Thread damage caused by thread engagement; 

3.The strict requirements for wear resistance and corrosion resistance in extreme environments; 

Therefore, adopting titanium alloy screws that have undergone DLC treatment is not merely an upgrade of a fastener; it is also a strategic investment in product reliability and the maintenance cost throughout its entire life cycle.