Preparation and properties of high emissivity Fe–Mn–matrix coatings by air plasma spraying

2015 ◽  
Vol 19 (sup4) ◽  
pp. S29-S33 ◽  
Author(s):  
Hao Wang ◽  
Xianjin Ning ◽  
Quansheng Wang ◽  
Yanbo Liu ◽  
Yuting Song
Keyword(s):  
Plasma Spraying ◽  
Air Plasma ◽  
Air Plasma Spraying ◽  
High Emissivity

Investigation of High Emissivity Coatings Prepared by Plasma Spraying

2011 ◽  
Vol 287-290 ◽  
pp. 2283-2287
Author(s):  
Can Wang ◽  
Quan Sheng Wang ◽  
Xian Jin Ning ◽  
Zhong Du ◽  
Yan Bo Liu ◽  
...  
Keyword(s):  
Bond Strength ◽  
Bulk Density ◽  
Plasma Spraying ◽  
Infrared Emissivity ◽  
Air Plasma ◽  
Air Plasma Spraying ◽  
Feedstock Powder ◽  
Plasma Sprayed ◽  
Normal Emissivity ◽  
High Emissivity

In this study, the feedstock powder for plasma spray was prepared by spray drying and post-sintering at 1360 °C using raw metal oxides. The high emissivity coating was deposited by air plasma spraying (APS). The microstructure, phase structure, flowability and bulk density of the plasma sprayed powder were characterized. The microstructure, bond strength and infrared emissivity of the high emissivity coating were also analyzed in this paper. The results reveal that the feedstock powder present good flowability of 42.36 (sp50g) with the bulk density of 1.94 gpml and is suitable for plasma spraying. A dense coating with the bond strength of 39.6MPa and the porosity less than 5 percent was prepared successfully. The normal emissivity of the coating in all waveband is 0.88 at 300°C and 0.87 at 600°C.

scholarly journals Optimization of Yb2O3-Gd2O3-Y2O3 Co-Doped ZrO2 Agglomerated and Calcined Powders for Air Plasma Spraying

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 373
Author(s):  
Zheng Yan ◽  
Haoran Peng ◽  
Kang Yuan ◽  
Xin Zhang
Keyword(s):  
Solid Solution ◽  
Particle Size ◽  
Plasma Spraying ◽  
Cubic Phase ◽  
Thermal Barrier ◽  
Air Plasma ◽  
Air Plasma Spraying ◽  
Barrier Coating ◽  
Controllable Preparation ◽  
Co Doped

Yb2O3-Gd2O3-Y2O3 co-doped ZrO2 (YGYZ) is considered to be a promising material in thermal barrier coating (TBC) applications. In this study, 2Yb2O3–2Gd2O3–6Y2O3–90ZrO2 (mol.%) (10YGYZ) feedstock candidates for air plasma spraying (APS) were prepared by calcination of agglomerated powders at 1100, 1200, 1300, 1400, and 1500 °C for 3 h, respectively. Incomplete solid solution was observed in calcined powders at 1100, 1200 and 1300 °C, and the 1500 °C calcined powder exhibited poor flowability due to intense sintering effect. The 1400 °C calcined powders were eventually determined to be the optimized feedstock for proper phase structure (cubic phase), great flowability, suitable apparent density and particle size distribution, etc. 10YGYZ TBCs with the optimized feedstock were prepared by APS, exhibiting pure c phase and good chemical uniformity. Controllable preparation of coatings with different porosity (i.e., 7%–9% and 12%–14%) was realized by stand-off distance adjustment.

Macroscopic particle modeling in air plasma spraying

2019 ◽  
Vol 364 ◽  
pp. 449-456 ◽  
Author(s):  
K. Bobzin ◽  
M. Öte ◽  
M.A. Knoch ◽  
I. Alkhasli
Keyword(s):  
Plasma Spraying ◽  
Air Plasma ◽  
Air Plasma Spraying ◽  
Particle Modeling

Thermal Cycling Behavior of Lanthanum-Cerium Oxide Thermal Barrier Coatings Prepared by Air Plasma Spraying

2007 ◽  
Vol 336-338 ◽  
pp. 1759-1761 ◽  
Author(s):  
Wen Ma ◽  
Yue Ma ◽  
Sheng Kai Gong ◽  
Hui Bin Xu ◽  
Xue Qiang Cao
Keyword(s):  
Cerium Oxide ◽  
Plasma Spraying ◽  
Thermal Barrier Coatings ◽  
Bond Coat ◽  
Room Temperature ◽  
Thermal Barrier ◽  
Air Plasma ◽  
Air Plasma Spraying ◽  
Cyclic Testing ◽  
Barrier Coatings

Lanthanum-cerium oxide (La2Ce2O7, LC) is considered as a new candidate material for thermal barrier coatings (TBCs) because of its low thermal conductivity and high phase stability between room temperature and 1673K. The LC coatings with different La2O3 contents were prepared by air plasma spraying (APS) and their lifetime was evaluated by thermal cyclic testing from room temperature to 1373 K. The structures of the coatings were characterized by XRD and SEM and the deviation of the composition from the powder was determined by EDS analysis. Long time annealing for the freestanding coating at 1673K reveals that the near stoichiometric LC coating is stable up to 240h, and the stability decreases with increasing the deviation from stoichiometric LC composition. During thermal cyclic testing, spallation was observed within the top coat near the bond coat. It is considered that the effect of intrinsic stress caused by the coefficient of thermal expansion (CTE) mismatch between top coat and bond coat is larger than that of thermally grown oxide (TGO) and the bond adherence of top coat with TGO.

Visible Light-Activated Self-Recovery Hydrophobic CeO2/Black TiO2 Coating Prepared Using Air Plasma Spraying

2019 ◽  
Vol 11 (40) ◽  
pp. 37209-37215 ◽  
Author(s):  
Lingyue Hu ◽  
Xuefeng Song ◽  
Xiao Shan ◽  
Xiaofeng Zhao ◽  
Fangwei Guo ◽  
...  
Keyword(s):  
Visible Light ◽  
Plasma Spraying ◽  
Tio2 Coating ◽  
Air Plasma ◽  
Air Plasma Spraying ◽  
Black Tio2

Segmentation crack formation dynamics during air plasma spraying of zirconia

2020 ◽  
Vol 183 ◽  
pp. 196-206 ◽  
Author(s):  
Shalaka V. Shinde ◽  
Edward J. Gildersleeve V ◽  
Curtis A. Johnson ◽  
Sanjay Sampath
Keyword(s):  
Plasma Spraying ◽  
Crack Formation ◽  
Air Plasma ◽  
Air Plasma Spraying ◽  
Formation Dynamics

Fluffy Polyfluoroalkoxy Layer Produced by Air Plasma Spraying Based on “Grapeshot” Effect

2019 ◽  
Vol 29 (3) ◽  
pp. 462-470 ◽  
Author(s):  
Shaowei Li ◽  
Peidong Li ◽  
Yu Tian ◽  
Yanjun Zheng
Keyword(s):  
Plasma Spraying ◽  
Air Plasma ◽  
Air Plasma Spraying

Mechanical Properties of Nanostructured Zirconia Coatings Fabricated by Air Plasma Spraying

2008 ◽  
Vol 368-372 ◽  
pp. 1280-1283 ◽  
Author(s):  
Hong Zhou ◽  
Jun Wang ◽  
Bo He ◽  
Fei Li ◽  
Jing Ma ◽  
...  
Keyword(s):  
Plasma Spraying ◽  
Rapid Development ◽  
Bimodal Distribution ◽  
Transmission Electron Micrograph ◽  
Air Plasma ◽  
Electron Micrograph ◽  
Air Plasma Spraying ◽  
Transmission Electron ◽  
Columnar Grains ◽  
Potential Applications

Nanostructured coatings are experiencing a rapid development in recent years due to their potential applications in a wide variety of technological areas. In order to improve the properties of thermal barrier coatings, nanostructured 8 wt% yttria partial stabilized zirconia coatings were deposited by air plasma spraying with reconstituted nanoparticles on titanium alloy substrates. For comparison, the conventional counterparts were also fabricated. Their microstructures were investigated by using transmission electron micrograph and scanning electron micrograph. Their mechanical behaviors were evaluated via Vickers microhardness test and tensile test. The results indicate that the nanostructured zirconia coatings with original nanostructure and columnar grains have higher microhardness and adhesive strength than the conventional counterparts. Both the nanostructured coating and the conventional coating exhibit a bimodal distribution of microhardness values, which are analyzed via Weibull statistics. This phenomenon is attributed to the presence of molten and non-molten parts in the coatings.

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