High Quality Diesel Fuel Injector EMBR00301D Auto Parts

Abstract
The armature is a core component of the electromagnetic actuator in modern fuel injectors, directly influencing the response speed, energy efficiency, and durability of the injection system. However, under high-frequency excitation and long-term cyclic loading, the armature surface is prone to wear, corrosion, and magnetic performance degradation, which can weaken electromagnetic force and delay actuation response. This study focuses on the preparation and performance optimization of nanocomposite coatings on injector armature surfaces to improve their tribological, corrosion-resistant, and magnetic properties.

Using magnetron sputtering and electrodeposition techniques, nanocomposite coatings composed of Ni–Fe–Al₂O₃ and Co–Ni–TiN systems were fabricated on high-strength steel substrates. The microstructure, composition, and surface morphology were characterized by SEM, EDS, and XRD analysis. Mechanical and magnetic properties were evaluated through microhardness testing, vibration sample magnetometry (VSM), and contact resistance measurement. Results indicate that the incorporation of nanoparticles significantly refined the grain size, enhanced coating density, and increased surface hardness by up to 42% compared with conventional electroplated layers.

From an electromagnetic perspective, the optimized Ni–Fe–Al₂O₃ coating exhibited higher magnetic permeability and lower eddy current loss, resulting in a 12% improvement in electromagnetic attraction force and a reduction of 15% in armature response delay under identical excitation conditions. Finite element simulation confirmed that the improved magnetic flux distribution within the coated armature contributed to faster response and reduced hysteresis loss. Furthermore, long-term durability tests demonstrated that the nanocomposite-coated samples maintained over 95% of their initial magnetic performance after 10⁶ operation cycles.

The study concludes that nanocomposite surface engineering is an effective approach to simultaneously enhance the mechanical strength, magnetic efficiency, and corrosion resistance of injector armatures. The proposed coating design provides a practical solution for achieving higher injection precision and extended service life in next-generation fuel injection systems.

Keywords: injector armature, nanocomposite coating, electromagnetic actuator, surface modification, magnetic performance, wear resistance