NiCrAlY Coatings in Yag Laser Combined Low Pressure Plasma Spraying

1998 ◽  
Author(s):  
N. Eguchi ◽  
Z. Zhou ◽  
H. Shirasawa ◽  
A. Ohmori
Keyword(s):  
Laser Irradiation ◽  
Steel Substrate ◽  
High Hardness ◽  
Low Pressure ◽  
Yag Laser ◽  
Pressure Plasma ◽  
Low Pressure Plasma ◽  
Porous Microstructure ◽  
Sprayed Coating ◽  
Plasma Sprayed

Abstract Densification of plasma sprayed NiCrAlY coatings was studied from the view point of hybrid spraying combined with YAG laser irradiation. Configuration of a laser irradiation beam was varied in three different ways while performing low pressure plasma hybrid spraying and the microstructure of each coating was investigated in comparison with a conventional plasma sprayed coating. Of the three types of hybrid spraying, namely, (D pre-laser-irradiation for preheating of a steel substrate, ©simultaneous laser irradiation, and (3) post-laser-irradiation for remelting of the plasma sprayed coating, simultaneous irradiation formed the optimum microstructure showing both the least amount of porosities and high hardness. Some metallurgical bonding was also observed at the interface with this type of spraying. The two other types of hybrid spraying resulted in either a significantly porous microstructure with pre-irradiation, or a low hardness coating with post-irradiation. The characteristics of these microstructures in each coating are explained with reference to thermal hysterisis behaviors.

Effect on Reverse Transferred Arc Treating on Bonding Strength in Low Pressure Plasma Spraying

1996 ◽  
Author(s):  
K. Honda ◽  
I. Chida ◽  
T. Fuse ◽  
T. Murakami ◽  
K.F. Kobayashi
Keyword(s):  
Plasma Spraying ◽  
Bonding Strength ◽  
Low Pressure ◽  
Test Method ◽  
Pressure Plasma ◽  
Low Pressure Plasma ◽  
Transferred Arc ◽  
Sprayed Coating ◽  
Plasma Sprayed ◽  
Low Pressure Plasma Spraying

Abstract Both bonding strength of coating to substrate in low pressure plasma spraying and the effect of reverse transferred arc treating before spraying are studied in this paper. It is difficult to obtain the bonding strength precisely in low pressure plasma spraying by standard testing methods, such as, ASTM Standard C633-79 and JIS H8666-80. Therefore, for the bonding strength test rather than using a conventional adhesive, we believe a vacuum brazing process using Ag-Cu-In-Ti active filler metal at 1023 K should be used. We have also confirmed the practicality of this step. By the above test method, it has been proven that the bonding strength of low pressure plasma sprayed coating is over 100 MPa. Also, that reverse transferred arc treating after blasting enhances the bonding strength of low pressure plasma sprayed coating. It is also believed that the projections formed on the substrate surface by reverse transferred arc treating are buried into the coating and perform the pile effect.

Characteristics of Low Pressure Plasma Sprayed Alumina Coating

2009 ◽  
Vol 24 (1) ◽  
pp. 117-121 ◽  
Author(s):  
Chun-Ming DENG ◽  
Ke-Song ZHOU ◽  
Min LIU ◽  
Chang-Guang DENG ◽  
Jin-Bing SONG ◽  
...  
Keyword(s):  
Low Pressure ◽  
Alumina Coating ◽  
Pressure Plasma ◽  
Low Pressure Plasma ◽  
Plasma Sprayed

scholarly journals Microstructure and Oxidation Behavior of Low Pressure Plasma Sprayed Iron Aluminides.

2001 ◽  
Vol 41 (9) ◽  
pp. 1010-1017 ◽  
Author(s):  
Naoya Masahashi ◽  
Sadao Watanabe ◽  
Shuji Hanada
Keyword(s):  
Oxidation Behavior ◽  
Low Pressure ◽  
Iron Aluminides ◽  
Pressure Plasma ◽  
Low Pressure Plasma ◽  
Plasma Sprayed

Very low-pressure plasma-sprayed dense yttria-stabilized zirconia coatings using an axial bi-cathode plasma torch

2020 ◽  
Vol 402 ◽  
pp. 126281
Author(s):  
Chen Song ◽  
Shi-ming Xie ◽  
Xiu-Juan Fan ◽  
Peng-Jiang He ◽  
Min Liu ◽  
...  
Keyword(s):  
Plasma Torch ◽  
Low Pressure ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Cathode Plasma ◽  
Pressure Plasma ◽  
Low Pressure Plasma ◽  
Plasma Sprayed
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