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Effect of Y_2O_3 stabilized ZrO_2 coating with tri-model structure on bi-layered thermally grown oxide evolution in nano thermal barrier coating systems at elevated temperatures

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Journal of Rare Earths 2014年第1期32卷 57-77页

作者： Mohammadreza Daroonparvar muhamad azizi mat yajid Noordin Mohd Yusof Hamid Reza Bakhsheshi-Rad Z.Valefi Esah Hamzah Department of materials Manufacturing and Industrial Engineering Faculty of Mechanical Engineering Universiti Teknologi Malaysia School of Metallurgy and materials College of Engineering University of Tehran

Bi-layered thermally grown oxide （TGO） layer plays a major role in the spallation of Y2O3 stabilized ZrO2 （YSZ） layer form the bond coat in the thermal barrier coating （TBC） systems during oxidation. On the other hand, bi-layered TGO formation and growth in the TBC systems with nanostructured YSZ have not been deeply investigated during cyclic oxidation. Hence, Inconel 738/NiCrAlY/normal YSZ and Inconel 738/NiCrAlY/nano YSZ systems were pre-oxidized at 1000 °C and then subjected to cyclic oxidation at 1150 °C. According to microstructural observations, nanostructured YSZ layer over the bond coat should have less mi-cro-cracks and pinholes, due to the compactness of the nanostructure and the presence of nano zones that resulted in lower O infiltration into the nanothermal barrier coating system, formation of thinner and nearly continuous mono-layered thermally grown oxide on the bond coat during pre-oxidation, lower spinels formation at the Al2O3/YSZ interface and finally, reduction of bi-layered thermally grown oxide thickness during cyclic oxidation. It was found that pre-heat treatment and particularly coating microstructure could influence microstructural evolution （bi-layered TGO thickness） and durability of thermal barrier coating systems during cyclic oxidation.

关键词： spinels oxidation three stages TGO growth pre-heat treatment rare earths

新型PEO/纳米结构ZrO_2镁合金涂层的抗菌活性及腐蚀行为（英文）

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Transactions of Nonferrous Metals Society of China 2018年第8期28卷 1571-1581页

作者： Mohammadreza DAROONPARVAR muhamad azizi mat yajid Rajeev KUMAR GUPTA Noordin MOHD YUSOF Hamid Reza BAKHSHESHI-RAD Hamidreza GHANDVAR Ehsan GHASEMI Department of materials Manufacturing and Industrial EngineeringFaculty of Mechanical Engineering Universiti Tetalologi Malaysia 81310 Johor Bahru Johor Malaysia Department of Chemical and Biomilecular Engineering Corrosion Engineering Program The University of Akron Akron OH-44325 United States of America Advanced materials Research Center Department of Materials Engineering Najafabad Branch Islamic Azad University Najafabad Iran Department of Clinical Sciences Faculty of Veterinary Medicine University of Tehran Tehran Iran

为了增强镁合金的耐腐蚀性和抗菌活性,先采用等离子体电解氧化(PEO)在镁合金上制备一层结合层,再用空气等离子喷涂(APS)制备纳米结构ZrO_2表面涂层。采用电化学试验研究涂层样品的腐蚀行为,采用琼脂扩散法对其进行大肠杆菌病原菌抑菌活... 详细信息

为了增强镁合金的耐腐蚀性和抗菌活性,先采用等离子体电解氧化(PEO)在镁合金上制备一层结合层,再用空气等离子喷涂(APS)制备纳米结构ZrO_2表面涂层。采用电化学试验研究涂层样品的腐蚀行为,采用琼脂扩散法对其进行大肠杆菌病原菌抑菌活性评价,并与无涂层样品进行对比。与PEO涂层和无涂层镁合金相比,PEO/纳米ZrO_2涂层样品的腐蚀电流密度最低,电荷传递阻力最高,相位角和阻抗模量最高。PEO结合涂层被纳米ZrO_2表面涂层完全密封,能够显著延缓侵蚀性离子向镁合金表面迁移,显著提高镁合金在模拟体液(SBF)中的耐蚀性。此外,PEO/纳米ZrO_2涂层的抗菌活性也高于PEO涂层和无涂层镁合金,这是由于ZrO_2纳米颗粒通过作用于细胞膜而降低了大肠杆菌的生长速率。

关键词：镁合金陶瓷涂层材料显微组织扫描电镜

纳米氧化铝作为第三层对热障涂层中热生长氧化物层的改善(英文)

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Transactions of Nonferrous Metals Society of China 2013年第5期23卷 1322-1333页

作者： Mohammadreza DAROONPARVAR muhamad azizi mat yajid Noordin Mohd YUSOF Saeed FAR AHANY Mohammad Sakhawat HUSSAIN Hamid Reza BAKHSHESHIRAD Z.VALEFI Ahmad ABDOLAHI Department of materials Manufacturing and Industrial EngineeringFaculty of Mechanical EngineeringUniversiti Teknologi Malaysia School of Metallurgy and materials College of EngineeringUniversity of Tehran

在热障涂层的顶层与连接层界面之间会生成热生长氧化物层。当涂层热暴露在空气中时,这种热生长氧化物的生长会导致陶瓷层与连接层的剥落。研究了4种大气等离子喷涂热障涂层在空气中的耐高温氧化性能。将这4种涂层放在1000°C的电炉中在... 详细信息

在热障涂层的顶层与连接层界面之间会生成热生长氧化物层。当涂层热暴露在空气中时,这种热生长氧化物的生长会导致陶瓷层与连接层的剥落。研究了4种大气等离子喷涂热障涂层在空气中的耐高温氧化性能。将这4种涂层放在1000°C的电炉中在空气下分别保温24、48和120h。组织观察表明,在纳米NiCrAlY/YSZ/纳米Al2O3涂层中,热生长氧化物层的生长速率远比其它3种涂层中的低。EDS和XRD分析表明,在热生长氧化物(Al2O3)涂层上,生成了Ni(Cr,Al)2O4混合氧化物(尖晶石型)和NiO,在纳米NiCrAlY/YSZ/纳米Al2O3涂层中,这种生长在Al2O3层上的有害混合氧化物层的厚度比在其它涂层中的低很多。

关键词：高温氧化纳米热障涂层热生长氧化物尖晶石