Preparation And Research On γ-Fe₂O₃/TiO₂ Composite Coatings

Non-magnetic spindle hematite was obtained by hydro lyzing FeCb with a little amount of PO43-; the non-magnetic ellipsoids with titanium were synthesized using the stober method, titanium coating of the spindle hematite was carried out non water ethanol as the base catalysis and tetrabutyl orthotitanate (TBOT) was added by titration method to the base catalysis as a titanium source; the magnetic ellipsoid core-shell structure y-Fe2O3/TiO2 were reducing, oxidizing and finally re-dispersing.The characterized morphology, composition and structure of the composite particles were observed by (TEM), (SEM), (XRD), and (EDS). The analysis results show that the composite particles prepared have an appropriate size, and were mono-disperse; magnetic γ-Fe2O3/TiO2 composite particles include Fe, O and Ti elements; the magnetic core-shell structure γy-Fe2O3/TiO2 composite particles were composed by of crystalline y-Fe2O3 with a face-centered cubic structure and amorphous structure of titanium.Ni-(γ-Fe2O3//TiO2) and Cu-(γ-Fe2O3/TiO2) composite coatings will prepared by direct current electro-deposition method. The effects of the different addition of composite particles, the magnetic field intensity, and the current density on the cathode of the composite plating on the contents of the magnetic γ-Fe2O3/TiO2 composite particles in the composite coatings. The contents of the composite particles in the composite coatings are represent by the content of the Ti element.The characterized morphology, composition and structure analysis of Ni-(γ-Fe2O3/TiO2) and Cu-(γ-Fe2O3/TiO2) composite coatings were observed by scanning electron microscopy (SEM), X-ray diffraction (XRD) and electron spectroscopy (EDS). The results show that the composite coating in which titanium contents was 1.92% and 2.4% can be prepared when the suspension dosage γ-Fe2O3/TiO2 in the composite both was 3mL, the current through the electromagnet was 0.05A and 0.01 A, and the cathode current density both was 3A/dm2, composite layer thickness 600nm and 1600nm and the γ-Fe2O3/TiO2 composite particles arranged well in the composite coatings.