研究目的
Investigating the effect of size factors of substrates on the formation of TiO2 layers with a well-developed acicular–fibrous structure on VT-20 titanium.
研究成果
A homogeneous TiO2 layer with an acicular–fibrous structure, consisting predominantly of rutile, can be produced on VT-20 titanium etched in a KOH solution and heat-treated in air. The formation of TiO2 fibers is influenced by etching time and oxidation temperature, with sample geometry having a weaker effect.
研究不足
The phase composition of the surface layer is dominated by rutile, the most thermodynamically favorable phase at a temperature of 800°C. The technique cannot produce fibers longer than 1 μ m or with diameters outside the 20–100 nm range under the described conditions.
1：Experimental Design and Method Selection:
The study involved etching VT-20 titanium substrates in a KOH solution followed by heat treatment to produce TiO2 layers with an acicular–fibrous structure.
2：Sample Selection and Data Sources:
VT-20 titanium substrates differing in dimensions and surface curvature were used.
3：List of Experimental Equipment and Materials:
SEM (Tescan Vega II and LEO 1420 microscopes), X-ray diffraction (Shimadzu XRD-6000 vertical X-ray diffractometer), KOH solution.
4：Experimental Procedures and Operational Workflow:
Samples were etched in an aqueous 10–20% KOH solution at 100°C and atmospheric pressure, rinsed with water, and heat-treated in air.
5：Data Analysis Methods:
Surface morphology was examined by SEM, and phase composition was determined by X-ray diffraction.
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