Preparation of Si/Mullite/Yb2SiO5 Environment Barrier Coating (EBC) by Plasma Spray-Physical Vapor Deposition (PS-PVD)

Tri-layer Si/mullite/Yb2SiO5 environmental barrier coating (EBC) was prepared on the SiCf/SiC ceramic matrix composite (CMC) by plasma spray-physical vapor deposition (PS-PVD). The EBC samples were carried out with water vapor corrosion at 1300 °C for 200 h. After steam corrosion, Yb2SiO5 layer forms a gradient porous structure. This is mainly due to the inclusion of SiO2-rich layer which is precipitated from the gasification inside the coating and existing a small amount of Yb2O3 separately. During the corrosion process, water vapor infiltrates into the coating and reacts with the SiO2 and Yb2O3 to generate volatile substances. This forms a porous structure to make the coating brittle, resulting in mud cracks finally. In addition, the results show that the Yb2SiO5 can react with the water vapor at the coating surface, forming an Yb2Si2O7 top layer.

Download Full-text

Oxidation performance of Si-HfO2 environmental barrier coating bond coats deposited via plasma spray-physical vapor deposition

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2019.125311 ◽

2020 ◽

Vol 384 ◽

pp. 125311 ◽

Cited By ~ 6

Author(s):

Bryan J. Harder

Keyword(s):

Plasma Spray ◽

Vapor Deposition ◽

Physical Vapor Deposition ◽

Environmental Barrier ◽

Bond Coats ◽

Environmental Barrier Coating ◽

Barrier Coating ◽

Oxidation Performance

Download Full-text

Solid Particle Erosion of a Plasma Spray – Physical Vapor Deposition Environmental Barrier Coating in a Combustion Environment

Ceramics International ◽

10.1016/j.ceramint.2021.05.154 ◽

2021 ◽

Author(s):

Michael J. Presby ◽

Bryan J. Harder

Keyword(s):

Solid Particle ◽

Plasma Spray ◽

Vapor Deposition ◽

Physical Vapor Deposition ◽

Solid Particle Erosion ◽

Particle Erosion ◽

Environmental Barrier ◽

Environmental Barrier Coating ◽

Barrier Coating ◽

Combustion Environment

Download Full-text

Microstructural and columnar growth characteristics of 7YSZ thermal barrier coatings fabricated by plasma spray physical vapor deposition

Journal of the European Ceramic Society ◽

10.1016/j.jeurceramsoc.2021.09.008 ◽

2021 ◽

Author(s):

Juhang Yin ◽

Cheng Lai ◽

Xiaofeng Zhang ◽

Li Zhang ◽

Xu Wang ◽

...

Keyword(s):

Thermal Barrier Coatings ◽

Plasma Spray ◽

Vapor Deposition ◽

Physical Vapor Deposition ◽

Growth Characteristics ◽

Thermal Barrier ◽

Columnar Growth ◽

Barrier Coatings

Download Full-text

Vapor Phase Deposition Using a Plasma Spray Process

Volume 1: Aircraft Engine; Ceramics; Coal, Biomass and Alternative Fuels; Education; Electric Power; Manufacturing Materials and Metallurgy ◽

10.1115/gt2010-22640 ◽

2010 ◽

Cited By ~ 4

Author(s):

Konstantin von Niessen ◽

Malko Gindrat

Keyword(s):

Plasma Spraying ◽

Thermal Spray ◽

Vapor Phase ◽

Plasma Spray ◽

Vapor Deposition ◽

Physical Vapor Deposition ◽

Low Pressure ◽

Spray Process ◽

Pressure Plasma ◽

Low Pressure Plasma

Plasma spray - physical vapor deposition (PS-PVD) is a low pressure plasma spray technology recently developed by Sulzer Metco AG (Switzerland) to deposit coatings out of the vapor phase. PS-PVD is developed on the basis of the well established low pressure plasma spraying (LPPS) technology. In comparison to conventional vacuum plasma spraying (VPS) and low pressure plasma spraying (LPPS), these new process use a high energy plasma gun operated at a work pressure below 2 mbar. This leads to unconventional plasma jet characteristics which can be used to obtain specific and unique coatings. An important new feature of PS-PVD is the possibility to deposit a coating not only by melting the feed stock material which builds up a layer from liquid splats but also by vaporizing the injected material. Therefore, the PS-PVD process fills the gap between the conventional physical vapor deposition (PVD) technologies and standard thermal spray processes. The possibility to vaporize feedstock material and to produce layers out of the vapor phase results in new and unique coating microstructures. The properties of such coatings are superior to those of thermal spray and electron beam - physical vapor deposition (EB-PVD) coatings. In contrast to EB-PVD, PS-PVD incorporates the vaporized coating material into a supersonic plasma plume. Due to the forced gas stream of the plasma jet, complex shaped parts like multi-airfoil turbine vanes can be coated with columnar thermal barrier coatings using PS-PVD. Even shadowed areas and areas which are not in the line of sight to the coating source can be coated homogeneously. This paper reports on the progress made by Sulzer Metco to develop a thermal spray process to produce coatings out of the vapor phase. Columnar thermal barrier coatings made of Yttria stabilized Zircona (YSZ) are optimized to serve in a turbine engine. This includes coating properties like strain tolerance and erosion resistance but also the coverage of multiple air foils.

Download Full-text