Structural Properties, Modeling and Optimization of Tribological Behaviors of Plasma Sprayed Ceramic Coatings

2014 ◽  
Vol 610 ◽  
pp. 984-992 ◽  
Author(s):  
Shuang Hchuan Chen ◽  
Ming Der Jean ◽  
Chyuan Du Liu ◽  
Shu Chuan Su ◽  
Shuen Chou Chen ◽  
...  
Keyword(s):  
Performance Optimization ◽  
Wear Behavior ◽  
Ceramic Coatings ◽  
Properties Of Coatings ◽  
Wear Resistant ◽  
Control Factors ◽  
Yttria Partially Stabilized Zirconia ◽  
Response Profiles ◽  
Plasma Sprayed ◽  
Worn Surface

This study used Taguchi plasma-sprayed experiments to determine the surface wear-resistant performance optimization of yttria partially stabilized zirconia (ZrO2/8Y2O3) coatings. Eight control factors based on L18 arrays were conducted and the wear-resistant properties of coatings were evaluated in the experiments. Based on analysis of variance, the optimal settings have been identified, and response surface methodology is utilized. Further, the contour nature of the quadric function is conducted to validate the tests in the Taguchi designed experiments. The experimental results obtained show that using an experimental design strategy with the proposed quadric model is useful not only for predicted optimal process parameters to achieve a desired quality but also for process optimization. Several response plots were generated to examine parameter effects on the response profiles. In addition, microstructures of the worn surface were examined, revealing a dense texture and highly anisotropic properties in the coatings with high anti-wear behavior.

Desirability-Based Performance Optimization of Wear-Resistant Coatings by HVOF Sprayed WC-Co Experiments

2011 ◽  
Vol 189-193 ◽  
pp. 3633-3639
Author(s):  
Ming Der Jean ◽  
Yih Hwang Yang ◽  
Tzu Hsuan Chien
Keyword(s):  
Wear Rate ◽  
Performance Optimization ◽  
Desirability Function ◽  
High Velocity Oxygen Fuel ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
Designed Experiments ◽  
Control Factors ◽  
Desirability Analysis ◽  
Oxygen Fuel

This study presented the desirability function based on Taguchi designed experiments to solve multiple responses statistical optimal problems for the tungsten carbide/cobalt (WC-Co) coatings of high-velocity-oxygen-fuel (HVOF) processes. The eight control factors based on L18 arrays were conducted and the multi-responses of wear-resistant coatings such as hardness, deposited thickness and wear rate were evaluated simultaneously in the desirability-based experiments. Based on desirability analysis, the optimal settings have been identified, and the impacts of control factors are determined by analysis of variance on the multi-responses. Further, a confirmation run was conducted to validate the tests. Experimental results have shown that the hardness increased by 16.61% and the deposited thickness improved by 10.50%, while the wear rate decreased by 34.03%. It was clear that confirmation tests are greatly improved by way of the desirability-based multi-responses on HVOF WC-Co experiments, and these findings achieved the desired values on wear-resistant coatings. The proposed procedure was applied at HVOF sprayed WC-Co experiments, and the implementation results demonstrated its feasibility and effectiveness to maximize hardness, make a target of deposited thickness value and minimize wear rate by a HVOF.

scholarly journals Wear Behavior Analysis of Al2O3 Coatings Manufactured by APS and HVOF Spraying Processes Using Powder and Suspension Feedstocks

Coatings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 879
Author(s):  
Monika Michalak ◽  
Paweł Sokołowski ◽  
Mirosław Szala ◽  
Mariusz Walczak ◽  
Leszek Łatka ◽  
...  
Keyword(s):  
Plasma Spraying ◽  
Wear Behavior ◽  
Ceramic Coatings ◽  
Suspension Plasma Spraying ◽  
Atmospheric Plasma ◽  
Hvof Spraying ◽  
The Coefficient Of Friction ◽  
Wear Mode ◽  
Α Al2o3 ◽  
Plasma Sprayed

Thermally sprayed ceramic coatings are applied for the protection of surfaces that are exposed mainly to wear, high temperatures, and corrosion. In recent years, great interest has been garnered by spray processes with submicrometric and nanometric feedstock materials, due to the refinement of the structure and improved coating properties. This paper compares the microstructure and tribological properties of alumina coatings sprayed using conventional atmospheric plasma spraying (APS), and various methods that use finely grained suspension feedstocks, namely, suspension plasma spraying (SPS) and suspension high-velocity oxy-fuel spraying (S-HVOF). Furthermore, the suspension plasma-sprayed Al2O3 coatings have been deposited with radial (SPS) and axial (A-SPS) feedstock injection. The results showed that all suspension-based coatings demonstrated much better wear resistance than the powder-sprayed ones. S-HVOF and axial suspension plasma spraying (A-SPS) allowed for the deposition of the most dense and homogeneous coatings. Dense-structured coatings with low porosity (4 vol.%) and good cohesion to the metallic substrate, containing a high content of α–Al2O3 phase (56 vol.%) and a very low wear rate (0.2 ± 0.04 mm3 × 10−6/(N∙m)), were produced with the S-HVOF method. The wear mechanism of ceramic coatings included the adhesive wear mode supported by the fatigue-induced material delamination. Moreover, the presence of wear debris and tribofilm was confirmed. Finally, the coefficient of friction for the coatings was in the range between 0.44 and 0.68, with the highest values being recorded for APS sprayed coatings.

Optimization of Mechanical Properties of Plasma Spraying Ceramic Coatings Using Artificial Intelligent Approaches

2013 ◽  
Vol 717 ◽  
pp. 164-169
Author(s):  
Ming Der Jean
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Response Characteristic ◽  
Ceramic Coatings ◽  
Quality Characteristics ◽  
Wear Depth ◽  
Control Factors ◽  
Orthogonal Experiments ◽  
Designed Experiment ◽  
Plasma Sprayed

This study reports on the use of Fuzzy-Grey systems, with a Taguchi designed experiment to enhance the quality characteristics of yttria stabilized zirconia (ZrO2/8%Y2O3) coatings, made by a plasma-sprayed process. Eight control factors were designed in an L18 orthogonal array experiment, and the effects of the control parameters on the surface properties were critically evaluated in the experiments. Multi-response characteristic terms-surface roughness, hardness and wear depth values in the sprayed ZrO2/8%Y2O3 coatings through the optimization were studied comparatively. A Fuzzy-Grey approach, based on the Taguchi orthogonal experiments for optimizing multi-response performance in the coatings, was reported. In addition, the influence of control factors on the Fuzzy-Grey systems for spraying processes was investigated by analysis of variance. In addition, a confirmation experiment was conducted. Experimental results have shown that the hardness increased by 18.67%, while the surface roughness decreased by 32.01%and the wear rate improved by 30.52%. It is clear that the multi-response quality characteristics for plasma sprayed coatings are greatly improved through Taguchi-Fuzzy-Grey analysis, and that these findings achieved the desired values in regard to the mechanical properties.

Sliding Wear Behavior of Plasma Sprayed Zirconia Ceramic Coating Under Different Conditions

2005 ◽  
Author(s):  
Thuong Hien Le ◽  
Young-Hun Chae ◽  
Seock Sam Kim
Keyword(s):  
Sliding Wear ◽  
Wear Behavior ◽  
Ceramic Coatings ◽  
Zirconia Ceramic ◽  
Wear Loss ◽  
Cast Aluminum Alloy ◽  
Cast Aluminum ◽  
Material Transfer ◽  
Bond Layer ◽  
Plasma Sprayed

The sliding wear behavior of ZrO2-22wt%MgO (MZ) and ZrO2-8wt%Y2O3 (YZ) deposited on a cast aluminum alloy with bond layer (NiCrCoAlY) by plasma spray against a SiC ball was investigated under dry and lubrication conditions at room temperature. At all load conditions, the wear mechanisms of the MZ and YZ coatings were almost the same. The wear mechanism involved material transfer and pullout under dry condition, but micro-fractures and spallation under lubrication condition. When oil was used for lubrication, the friction coefficient of the sliding pairs and the wear loss of the ceramics were reduced. The wear loss of the MZ coating was less than that of the YZ coating under dry test, but more than that of the YZ coating under lubrication test. The test conditions and the mechanical properties of the ceramic coatings were correlated to the wear performance.

Comparative study on the corrosion and wear behavior of plasma-sprayed vs. high velocity oxygen fuel-sprayed Al8Si20BN ceramic coatings

2018 ◽  
Vol 44 (11) ◽  
pp. 12180-12193 ◽  
Author(s):  
Mitra Akhtari Zavareh ◽  
Ehsan Doustmohammadi ◽  
Ahmed A.D.M Sarhan ◽  
Ramin Karimzadeh ◽  
Pooria Moozarm Nia ◽  
...  
Keyword(s):  
Comparative Study ◽  
High Velocity ◽  
Wear Behavior ◽  
Ceramic Coatings ◽  
Corrosion And Wear ◽  
High Velocity Oxygen Fuel ◽  
Plasma Sprayed ◽  
Oxygen Fuel

Optimization of Integrated Properties of Zirconia Ceramic Coatings Fabricated by a Plasma Spraying

2010 ◽  
Vol 156-157 ◽  
pp. 670-676
Author(s):  
Ming Der Jean ◽  
Ming Cheng Li ◽  
Tzu Hsuan Chien ◽  
Huang Chang
Keyword(s):  
Surface Roughness ◽  
Orthogonal Experiment ◽  
Ceramic Coatings ◽  
Quality Characteristics ◽  
Zirconia Ceramic ◽  
Wear Volume ◽  
Relational System ◽  
Control Factors ◽  
Plasma Sprayed ◽  
Grey Relational

This study reports on the Grey relational system, with a statistical experiment to enhance the quality characteristics of yttria stabilized zirconia (ZrO2/8%Y2O3)coatings made by a plasma-sprayed process. The eight control factors were designed in an L18 factorial orthogonal array experiment, and the effects of the control parameters on the surface properties were critically evaluated in the experiments. The characteristic terms- surface roughness, porosity, hardness, and wear volume in the sprayed ZrO2/8%Y2O3 coatings through the optimization- were studied comparatively. A grey relational system, based on the Taguchi orthogonal experiment for optimizing multi-responses in the modified properties, was reported. In addition, the influence of control factors on the grey relational system for spraying processes was investigated by analysis of variance. In addition, a confirmation experiment was conducted. Experimental results have shown that the hardness increased by 31.19%, while the surface roughness decreased by 40.67%, the porosity was reduced by 53.53%, and the wear rate improved by 24.21%. It is clear that the quality characteristics for plasma sprayed coatings are greatly improved through grey relational analysis, and that these findings achieved the desired values in regard to the modified properties.

Electron microscopy studies of plasma-sprayed materials

1983 ◽  
Vol 41 ◽  
pp. 70-71
Author(s):  
K.R. Subramanian ◽  
A.H. King ◽  
H. Herman
Keyword(s):  
Plasma Spraying ◽  
Substrate Surface ◽  
Flame Temperature ◽  
Ceramic Coatings ◽  
Metallic Substrates ◽  
Hot Plasma ◽  
Almost All ◽  
Plasma Sprayed ◽  
Hostile Environments ◽  
Plasma Spraying Process

Plasma spraying is a technique which is used to apply coatings to metallic substrates for a variety of purposes, including hardfacing, corrosion resistance and thermal barrier applications. Almost all of the applications of this somewhat esoteric fabrication technique involve materials in hostile environments and the integrity of the coatings is of paramount importance: the effects of process variables on such properties as adhesive strength, cohesive strength and hardness of the substrate/coating system, however, are poorly understood.Briefly, the plasma spraying process involves forming a hot plasma jet with a maximum flame temperature of approximately 20,000K and a gas velocity of about 40m/s. Into this jet the coating material is injected, in powder form, so it is heated and projected at the substrate surface. Relatively thick metallic or ceramic coatings may be speedily built up using this technique.

Investigating formation, structure and properties of coatings based on Cu–Ti alloys

2019 ◽  
pp. 175-181
Author(s):  
A. I. Kovtunov ◽  
T. V. Semistenova ◽  
A. M. Ostryanko
Keyword(s):  
Wear Resistance ◽  
Heat Resistance ◽  
Chemical Compound ◽  
Wear Resistant Coating ◽  
Titanium Coating ◽  
Structure And Properties ◽  
Properties Of Coatings ◽  
Wear Resistant ◽  
Ti Alloys ◽  
Titanium Wire

The paper offers technology of argon-arc surfacing with titanium wire in order to form heat and wear resistant coating based on the titanium cuprides. The influence of surfacing modes on the chemical compound and structure of formed coatings is determined. The wear resistance and heat resistance at 600°C and 800°C were researched for copper–titanium coating with 8–63% titanium.

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