scholarly journals Effect of Duty Cycle on Properties of Al2O3 Ceramic Coatings Fabricated on TiAl Alloy via Cathodic Plasma Electrolytic Deposition

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1962 ◽  
Author(s):  
Shaoqing Wang ◽  
Faqin Xie ◽  
Xiangqing Wu ◽  
Jixiang An
Keyword(s):  
Electron Microscopy ◽  
Wear Resistance ◽  
Heat Resistance ◽  
Duty Cycle ◽  
Tial Alloy ◽  
Ceramic Coatings ◽  
Electrolytic Deposition ◽  
Al2o3 Ceramic ◽  
Cathodic Plasma ◽  
Plasma Electrolytic

In order to study the effect of duty cycle during the cathodic plasma electrolytic deposition (CPED) process, Al2O3 ceramic coatings were fabricated via the CPED technique on prepared TiAl alloy in an Al(NO3)3 electrolyte with different duty cycles. Microstructure, morphology, and chemical compositions of coatings were analyzed by scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), transmission electron microscopy (TEM), and X-ray diffraction (XRD). The mechanical properties, such as thickness, hardness, and binding strength, were also characterized, and heat-resistance and wear-resistance tested. The results indicated that duty cycle mainly affected the relative crystallinity of CPED coatings. As the duty cycle increased, the crystallinity of CPED coatings increased, the content of Al(OH)3 and γ-Al2O3 decreased, and the content of α-Al2O3 increased. The thickness and bonding strength both increased firstly and then decreased, while hardness increased as duty cycle increased. Heat-resistance and wear-resistance of TiAl alloy with CPED coating was highly improved compared to that of TiAl alloy substrate without CPED coating.

Cathodic plasma electrolytic deposition of ZrO2/YSZ doped Al2O3 ceramic coating on TiAl alloy

2019 ◽  
Vol 45 (15) ◽  
pp. 18899-18907 ◽  
Author(s):  
Shaoqing Wang ◽  
Faqin Xie ◽  
Xiangqing Wu ◽  
Yong Ma ◽  
Haoxuan Du ◽  
...  
Keyword(s):  
Tial Alloy ◽  
Ceramic Coating ◽  
Electrolytic Deposition ◽  
Al2o3 Ceramic ◽  
Cathodic Plasma ◽  
Plasma Electrolytic

Mechanism of Cathodic Plasma Electrolytic Deposition on Ti6Al4V Alloy in Al(NO3)3 Ethanol-Aqueous Solution

2018 ◽  
Vol 1145 ◽  
pp. 54-58
Author(s):  
Shao Qing Wang ◽  
Fa Qin Xie ◽  
Xiao Fei Yao ◽  
Xiang Qing Wu
Keyword(s):  
Infrared Absorption Spectrum ◽  
Silicate Solution ◽  
Ceramic Coatings ◽  
Ti6al4v Alloy ◽  
Electrolytic Deposition ◽  
Compression Method ◽  
Micro Arc Oxidation ◽  
Cathodic Plasma ◽  
Plasma Electrolytic ◽  
Energy Disperse Spectroscopy

Barrier layer was prepared by Micro-arc oxidation(MAO) technique in silicate solution, and cathodic plasma electrolytic deposition (CPED) technique was used to fabricate Al2O3 ceramic coatings on Ti6Al4V alloy in Al(NO3)3(30g/L) and ethanol-aqueous solutions. Surface morphology and elemental of the coatings were investigated by scanning electron microscope (SEM) and energy disperse spectroscopy (EDS). Reaction phenomena were recorded and products of reactions were analyzed by infrared absorption spectrum KBr compression method. Furthermore, mechanisms of different electrolytes were evaluated.

scholarly journals ΖrO2-Υ2Ο3 Ceramic Coatings Prepared by Cathodic Plasma Electrolytic Deposition

2004 ◽  
Vol 23 (3) ◽  
pp. 205-210 ◽  
Author(s):  
Wei Han, ◽  
Yedong He, ◽  
Deren Wang, ◽  
Rundong Xue, ◽  
Wei Gao,
Keyword(s):  
Ceramic Coatings ◽  
Electrolytic Deposition ◽  
Cathodic Plasma ◽  
Plasma Electrolytic

Laser Sintering of Nano-Al2O3 Powders on Plasma Sprayed Ceramic Based Coatings

2007 ◽  
Author(s):  
Lida Shen ◽  
Yinhui Huang ◽  
Zongjun Tian ◽  
Guoran Hua
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Plasma Spraying ◽  
Bond Coat ◽  
Continuous Wave ◽  
Ceramic Coatings ◽  
Laser Sintering ◽  
Al2o3 Ceramic ◽  
Plasma Sprayed ◽  
Steel Substrates

This paper describes an investigation of nano-Al2O3 powders reinforced ceramic coatings, which has included NiCrAl and Al2O3+13%wt.TiO2 coats pre-produced by atmosphere plasma spraying, implemented by laser sintering. Commercial NiCrAl powders were plasma sprayed onto 45 Steel substrates to give a bond coat with thickness of ∼100μm. The 600μm thick Al2O3+13%wt.TiO2 based coating was also plasma sprayed on top of the NiCrAl bond coat. With 2.5kw continuous wave CO2 laser, nano-Al2O3 ceramic powders were laser sintered on the based Coatings. The micro structure and chemical composition of the modified Al2O3+13%wt.TiO2 coatings were analyzed by such detection devices as scanning electronic microscope (SEM) and x-ray diffraction (XRD). Microhardness, wear resistance and corrosion resistance of the modified coatings were also tested and compared with that of the unmodified. The results show that the crystal grain size of Al2O3 had no obvious growth. In addition, due to the nanostructured Al2O3 ceramic phases, the coatings exhibited higher microhardness, better wear resistance and corrosion resistance than those unmodified counterparts. The complex process of plasma spraying with laser sintering as a potential effective way of the application of ceramic nano materials was also simply discussed and summarized in the end.

Preparation of Mn doped Al2O3 heat-dissipating coatings on titanium alloy by cathodic plasma electrolytic deposition

Vacuum ◽  
2019 ◽  
Vol 159 ◽  
pp. 228-234 ◽  
Author(s):  
Zhikai Liu ◽  
Qiu Sun ◽  
Ying Song ◽  
Hairui Wang ◽  
Xiangqun Chen ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Electrolytic Deposition ◽  
Cathodic Plasma ◽  
Plasma Electrolytic ◽  
Mn Doped

scholarly journals Cathodic boriding and anodic polishing of medium-carbon steel by plasma electrolysis

2021 ◽  
Vol 2144 (1) ◽  
pp. 012027
Author(s):  
S S Korableva ◽  
I R Palenov ◽  
I M Naumov ◽  
A A Smirnov ◽  
I A Kusmanova ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Carbon Steel ◽  
Sulfate Solution ◽  
Medium Carbon Steel ◽  
Operating Voltage ◽  
Medium Carbon ◽  
Plasma Electrolysis ◽  
Electrolytic Polishing ◽  
Cathodic Plasma ◽  
Plasma Electrolytic

Abstract The possibility of cathodic plasma electrolytic boriding of medium-carbon steel in an aqueous solution of ammonium chloride and boric acid followed by anodic plasma electrolytic polishing in an ammonium sulfate solution on the same equipment with a change in the operating voltage is shown. The morphology and roughness of the surface, microhardness of the modified layer have been investigated. Wear resistance was studied under dry friction conditions. It has been established that cathodic boriding at 850 °C for 5–30 min leads to the hardening of the surface layer up to 1050 HV with an increase in roughness by 1.5–2.5 times and wear resistance by 3.5 times. Subsequent anodic plasma electrolytic polishing of the boriding surface leads to a decrease in roughness with an increase in wear resistance by 2.3 times.

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