scholarly journals Optimization of Masking Process of Steel Tube During Atmospheric Plasma Spraying, for Use in Serial Production

TEM Journal ◽  
2020 ◽  
pp. 515-526
Author(s):  
Jozef Kužma ◽  
Michal Krescanko ◽  
David Goldyniak ◽  
Akash Nag
Keyword(s):  
Plasma Spraying ◽  
Chromium Steel ◽  
Steel Tube ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Serial Production ◽  
Technological Factors ◽  
Coating Layers ◽  
Select Material ◽  
Surface Changes

This study deals with the influence of selected technological factors on hardness, surface quality and topography of substrates after 24 layers of NiCr plasma was self-peeled off. The paper also deals with frequency of self-peeling the layers and the SEM observation of the deposited layers and substrates. Presented procedures and experimental results demonstrate changes and resistance of individual materials after an application of 24 plasma coatings. Samples from materials duralumin, chromium steel and material with the coating Ni-Cu-Ni were tested. The least impact for surface changes of substrate had samples from chromium steel. For this reason, chromium steel samples were also tested and compared for self-peeling frequency with respect to the number of coating layers and angle of surface. The main objective of this work was to select material, angle of plasma spraying and surface cleanliness that will show the least change in hardness and roughness after multiple plasma spraying with respect to the longest life of the cover mask. Cover mask is necessary for covering required areas of steel tube that must not be affected by plasma spraying, for use in serial production.

Effect of binary rare earth oxide on the properties of plasma sprayed Al2O3/TiO2 coatings

2017 ◽  
Vol 69 (5) ◽  
pp. 808-814
Author(s):  
Qingjun Ding ◽  
Bo Tian ◽  
Gai Zhao ◽  
Feng Wang ◽  
Huafeng Li ◽  
...  
Keyword(s):  
Rare Earth ◽  
Plasma Spraying ◽  
Adhesion Strength ◽  
Rare Earth Oxide ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Micro Hardness ◽  
Content Type ◽  
Melting Degree ◽  
Binary Rare Earth

Purpose This study systematically investigated the effect of the binary rare earth oxide of La2O3 and Sm2O3 on the properties of the Al2O3/TiO2 (AT) coating, including phase transform, wear behavior, etc. Design/methodology/approach AT coatings mixed with different components of binary rare earth oxides of La2O3 and Sm2O3 are prepared by atmospheric plasma spraying. The adhesion strength, micro-hardness, phase transition and tribological behavior of coatings are systematically investigated. Findings The X-ray diffraction (XRD) analysis shows that phase transformation is obvious after spraying, and a-Al2O3 is almost translated into γ-Al2O3 when La2O3 and Sm2O3 are doped together. Meanwhile, solid solution generated between rare earth oxide and Al2O3/TiO2 coatings results in disappearance of TiO2 and rare earth oxide phase. The photos under the scanning electron microscope (SEM) indicate that binary rare earth oxide could increase the melting degree of powder and decrease porosity of coatings.The increasing of Sm2O3 rarely affect micro-hardness and adhesion strength, and the coating with 4 per cent Sm2O3 and 1 per cent La2O3 exhibits the best wear resistance and lowest friction coefficient among all the samples. Originality/value AT coatings mixed with different components of binary rare earth oxide of La2O3 and Sm2O3 are prepared by atmospheric plasma spraying. Binary rare earth oxide could increase the melting degree of powder and decrease porosity of AT coatings.

Tribological and Thermal Properties of Mullite Coating Prepared by Atmospheric Plasma Spraying

2013 ◽  
Vol 23 (3) ◽  
pp. 410-419 ◽  
Author(s):  
Yulong An ◽  
Xiaoqin Zhao ◽  
Guoliang Hou ◽  
Huidi Zhou ◽  
Jie Chen ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Plasma Spraying ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Mullite Coating
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