Preparation and characterization of molybdenum disilicide coating on molybdenum substrate by air plasma spraying

2013 ◽  
Vol 284 ◽  
pp. 881-888 ◽  
Author(s):  
Yi Wang ◽  
Dezhi Wang ◽  
Jianhui Yan ◽  
Aokui Sun
Keyword(s):  
Plasma Spraying ◽  
Molybdenum Disilicide ◽  
Air Plasma ◽  
Air Plasma Spraying ◽  
Molybdenum Substrate ◽  
Molybdenum Disilicide Coating

Microstructure and Oxidation Behavior of Molybdenum Disilicide Coating Prepared by Air Plasma Sprayed

2011 ◽  
Vol 686 ◽  
pp. 583-588 ◽  
Author(s):  
Jian Hui Yan ◽  
Si Wen Tang ◽  
Jian Guang Xu
Keyword(s):  
Plasma Spraying ◽  
Gas Turbines ◽  
Hexagonal Lattice ◽  
Molybdenum Disilicide ◽  
Temperature Structure ◽  
Air Plasma ◽  
Air Plasma Spraying ◽  
Plasma Sprayed ◽  
Molybdenum Disilicide Coating ◽  
Oxidation Behaviors

Intermetallics molybdenum dislicied has a great potential as a protective coating in aircraft engines and gas turbines in the elevated temperature. The suit for plasma spraying MoSi2powders were prepared by spray drying process and vacuum sintered. The oxidation behaviors of the coating were determined at 1200 °C. The coatings as sprayed and oxidized were characterized by XRD, SEM and EDS. Results show that the flow ability and loose density of MoSi2powder by sintered treatment, were 17.1 s/50g and 2.1g/cm3, respectively, ideal for air plasma spraying. During the course of spraying, some of molybdenum disilicide with a tetragonal lattice was converted into molybdenum disilicide with a hexagonal lattice. Also, part of MoSi2 phase oxidized and transformed to Mo5Si3phase. A relative dense molybdenum disilicide coating was prepared by air plasma spraying. A protective SiO2layer, seems to be glassy, with a thickness about 10 μm was formed on the surface of MoSi2coating during MoSi2coating oxidized at 1200°C for 200 h. The results of the oxidation tests show that MoSi2coating prepared by air plasma spraying may be provide a protect layer for high temperature structure material.

Synthesis and characterization of aluminum oxide–boron carbide coatings by air plasma spraying

2010 ◽  
Vol 36 (5) ◽  
pp. 1517-1522 ◽  
Author(s):  
Amit Datye ◽  
Srinivasarao Koneti ◽  
George Gomes ◽  
Kuang-Hsi Wu ◽  
Hua-Tay Lin
Keyword(s):  
Aluminum Oxide ◽  
Boron Carbide ◽  
Plasma Spraying ◽  
Synthesis And Characterization ◽  
Air Plasma ◽  
Air Plasma Spraying ◽  
Carbide Coatings

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
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