Microstructures and Properties of Laser Cladding Al-TiC-CeO₂ Composite Coatings

Area of Science:

• Materials Science
• Surface Engineering
• Composite Materials

Background:

• Laser cladding is a key technique for creating advanced coatings.
• Understanding the relationship between processing parameters and coating properties is crucial for material optimization.

Purpose of the Study:

• To investigate the microstructure and properties of Al-TiC-CeO₂ composite coatings prepared by laser cladding.
• To determine the effect of laser power on coating characteristics, including hardness, wear, and corrosion resistance.

Main Methods:

• Laser cladding technique for coating preparation.
• Characterization using SEM, 3D microscopy, XRD, micro-hardness testing, stress measurements, friction/wear tests, and electrochemical analysis.

Main Results:

• Formation of Al-Fe phase with good metallurgical bonding.
• Microstructure evolved from massive/rod-like to fine granular with increasing laser power, enhancing grain strengthening.
• Microhardness peaked at 964.3 HV₀.₂.
• Tensile residual stress observed, with crack size increasing with stress.
• High corrosion resistance achieved at 1.6 kW laser power.

Conclusions:

• Laser cladding parameters significantly influence the microstructure and properties of Al-TiC-CeO₂ coatings.
• Fine grain strengthening and optimal laser power are key to achieving high microhardness and corrosion resistance.
• The study provides insights for designing high-performance composite coatings for demanding applications.