研究目的
To investigate the feasibility of laser cladding Ti-Al2O3 with different Al2O3 fractions on Ti-6Al-4V alloy to establish a coating with optimal Al2O3 fractions portraying better microhardness and corrosion resistance in simulated body conditions.
研究成果
Laser cladding of Ti-Al2O3 coatings on Ti-6Al-4V alloy is feasible and improves hardness and corrosion resistance. Ti-5 wt.% Al2O3 coating showed optimal corrosion resistance with 81% reduction in corrosion rate and 709% increase in polarization resistance, while Ti-10 wt.% Al2O3 provided the highest hardness improvement (2.2 times substrate hardness). However, higher Al2O3 content increased defects, suggesting a trade-off between hardness and corrosion properties. This coating method can enhance the performance of Ti-6Al-4V bio-implants.
研究不足
The study is limited to specific Al2O3 fractions (5, 8, 10 wt.%) and laser parameters; higher Al2O3 content led to defects like pores and cracks, reducing corrosion resistance. The experiments were conducted in simulated body fluid (Hank's solution), not in vivo conditions, which may not fully replicate real biological environments.
1：Experimental Design and Method Selection:
Laser cladding was used to fabricate Ti-Al2O3 coatings on Ti-6Al-4V alloy substrates with varying Al2O3 fractions (5, 8, and 10 wt.%) to improve hardness and corrosion resistance. Laser parameters included 900 W power,
2：6 m/min scan speed, and 2 l/min powder feed rate. Sample Selection and Data Sources:
Substrate material was Ti-6Al-4V alloy (35x35x5 mm3). Coating materials were commercial pure titanium and alumina powders (
3：3). Coating materials were commercial pure titanium and alumina powders (9% purity) from Sigma Aldrich, mixed using a Turbula mixer. List of Experimental Equipment and Materials:
99.9% purity) from Sigma Aldrich, mixed using a Turbula mixer. 3. List of Experimental Equipment and Materials: Equipment included a Rofin Sinar Nd:YAG laser, SEM (FE-SEM JSM-7600F), OPM, XRD (Philips P1710 Panalytical), Vickers hardness tester (EMCOTEST), and Autolab potentiostat (PGSTAT30). Materials included Ti-6Al-4V substrate, Ti and Al2O3 powders, Hank's solution for corrosion testing.
4：0). Materials included Ti-6Al-4V substrate, Ti and Al2O3 powders, Hank's solution for corrosion testing. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Substrates were sandblasted and cleaned. Laser cladding was performed with argon shielding gas. Coatings were characterized for microstructure (SEM, OPM), phase constituents (XRD), microhardness (Vickers tester), and corrosion behavior (potentiostat in Hank's solution).
5：Data Analysis Methods:
Microhardness was averaged from multiple indentations. Corrosion parameters were derived using Tafel extrapolation method with NOVA software. Repeatability was assessed per ISO 5725-2.
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