溶凝膠浸鍍法與微弧氧化法製備功能性氧化層

陳光幅

doi:10.6341/fcu.P0126616

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溶凝膠浸鍍法與微弧氧化法製備功能性氧化層

Functional oxide layers by sol–gel dip-coating and micro-arc oxidation

陳光幅 , Ph.D　　Advisor：金重勳　　

英文 DOI： 10.6341/fcu.P0126616

透明導電薄膜；光穿透率；導電型態；微弧氧化；微硬度；耐腐蝕性；耐磨耗性； Transparent conducting oxide ； Optical transmittance ； Electrical conductivity ； Micro-arc oxidation ； Micro-hardness ； Corrosion resistance ； Wear resistance

Abstract │ Reference (262) │ Altmetrics

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Functional oxide films with thickness from a few tens of nanometers to several hundred micrometers exhibiting special properties are widely applied in industries. These include transparent conducting oxides (TCO) which make insulating glasses conducting and transparent. They may also include hard and hermetic oxide coatings on relatively soft metals such as Al, Mg and Ti and their alloys. The purposes of this study are to explore the two extremes of surface modification, i.e., TCO by dip-coating and protective oxides by micro-arc oxidation. For TCO studies, our concerns are the effects of dopant on the structure, optical transmittance, electrical conductivity and in particular the change in conduction type of tin oxide film as deposited on a glass substrate. For MAO coating we explore factors such as power supply, additives or treatment time on properties of mechanical, corrosion resistance and tribology of ceramic coatings on 6061 Al alloy. 
The TCO systems investigated in this dissertation were boron doped tin oxide (BTO), fluorine doped tin oxide (FTO) and neodymium-fluorine doped tin oxide (NFTO) films. For BTO films, conduction type changes from n- (un-doped) to p- (1–4 at.% B), then to n-types (5 at.% B), as evidenced from Hall-effect and Seebeck-effect measurements. This is explained by doping-generated defects and phase separations of Sn3O4 and B2O3. The essence of FTO films was the preparation by using a green sol–gel dip-coating process, using non-toxic SnF2 as fluorine source to replace conventional toxic HF or NH4F. Effect of SnF2 content, 0–10 mol%, on structure, electrical resistivity, and optical transmittance of the films were investigated and discussed. Transparent p-type conducting oxide films with high conductivity and transparency of neodymium-fluorine doped tin oxide has been discovered for the first time in literature with NdF3 used as both neodymium and fluorine sources. The NFTO film with 2 mol% NdF3 shows the lowest electrical resistivity, 8.2 x 10–3  cm, the highest hole-concentration, 8.96 x 1019 cm–3 and a Hall mobility 9.74 cm2 V–1 s–1. 
	For MAO coatings on 6061 Al alloy, a simple and less reported hybrid voltage (a direct current coupled with an alternative current, DC + AC) as power supply for the MAO process was explored. Comparing with MAO layers obtained by using DC only, the oxide-layer by hybrid voltages is a little thinner, much harder and much more corrosion resistant. In addition, the effect of additives into electrolyte to the properties of MAO coating is investigated. An anomalous layer-thickening occurred when adding ammonia water into the silicate electrolyte. Average coating thickness increases from 44 m (un-added bath) to 135 m (60 mL/L added bath), along with the reduction in number and size of the pores and cracks. This causes a great improvement in corrosion resistance of the coating. In another study, diamond powder (0, 3, 6 and 9 g/L) was used into the electrolyte containing Na2SiO3 and H3BO3. With 6 g/L added content, the MAO coating shows the best performance in wear and corrosion resistance.

Reference ( 262 ) 〈TOP〉

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連結：
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