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首页> 美国卫生研究院文献>Materials >Effect of Duty Cycle on Properties of Al2O3 Ceramic Coatings Fabricated on TiAl Alloy via Cathodic Plasma Electrolytic Deposition
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Effect of Duty Cycle on Properties of Al2O3 Ceramic Coatings Fabricated on TiAl Alloy via Cathodic Plasma Electrolytic Deposition

机译：占空比对阴极等离子体电解沉积TiAl合金制备Al2O3陶瓷涂层性能的影响

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摘要

In order to study the effect of duty cycle during the cathodic plasma electrolytic deposition (CPED) process, Al2O3 ceramic coatings were fabricated via the CPED technique on prepared TiAl alloy in an Al(NO3)3 electrolyte with different duty cycles. Microstructure, morphology, and chemical compositions of coatings were analyzed by scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), transmission electron microscopy (TEM), and X-ray diffraction (XRD). The mechanical properties, such as thickness, hardness, and binding strength, were also characterized, and heat-resistance and wear-resistance tested. The results indicated that duty cycle mainly affected the relative crystallinity of CPED coatings. As the duty cycle increased, the crystallinity of CPED coatings increased, the content of Al(OH)3 and γ-Al2O3 decreased, and the content of α-Al2O3 increased. The thickness and bonding strength both increased firstly and then decreased, while hardness increased as duty cycle increased. Heat-resistance and wear-resistance of TiAl alloy with CPED coating was highly improved compared to that of TiAl alloy substrate without CPED coating.
机译：为了研究占空比对阴极等离子体电解沉积（CPED）过程的影响，通过CPED技术在不同占空比的Al（NO3）3电解质中制备的TiAl合金上制备了Al2O3陶瓷涂层。通过扫描电子显微镜（SEM），能量色散光谱（EDS），透射电子显微镜（TEM）和X射线衍射（XRD）分析了涂层的微观结构，形态和化学成分。还表征了机械性能，例如厚度，硬度和粘合强度，并测试了耐热性和耐磨性。结果表明，占空比主要影响CPED涂层的相对结晶度。随着占空比的增加，CPED涂层的结晶度增加，Al（OH）3和γ-Al2O3的含量减少，而α-Al2O3的含量增加。厚度和结合强度先增加然后减少，而硬度随着占空比的增加而增加。与不带CPED涂层的TiAl合金基材相比，带CPED涂层的TiAl合金的耐热性和耐磨性得到了极大的改善。

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