Characterization of Al2O3 and SiC Particles, Reinforced Al Powders, and Plasma Sprayed Wear Resistance Coatings

2000 ◽  
Author(s):  
Fr.-W. Bach ◽  
T. Duda ◽  
Z. Babiak ◽  
P. Bohling ◽  
B. Formanek
Keyword(s):  
Wear Resistance ◽  
Atmospheric Plasma ◽  
Mechanically Alloyed ◽  
Aluminum Coatings ◽  
Hard Particles ◽  
Sic Particles ◽  
Plasma Sprayed ◽  
Aluminum Substrates ◽  
Wear Resistance Coatings

Abstract Aluminum coatings reinforced with either Al2O3 or SiC particles were deposited onto aluminum substrates and subjected to various tests. The coatings were made with mechanically alloyed powders via atmospheric plasma spraying (APS). Both types of coatings had uniformly distributed hard particles, porosities in the range of 4 to 5%, and bond strengths of around 20 MPa. The wear resistance of the SiC-reinforced coatings, however, was almost 35% higher than the coatings containing Al2O3. X-ray examination (XRD) showed that the Al2O3 particles undergo partial phase transformation during spraying, making them more prone to wear.

scholarly journals Microstructure and Wear Behaviors of Plasma-Sprayed MoAlB Ceramic Coating

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 474
Author(s):  
Fuzhu Li ◽  
Shengnan Sun ◽  
Yong Xu ◽  
Lihui Tian ◽  
Yun Wang ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Plasma Spraying ◽  
Ceramic Coating ◽  
Adhesive Wear ◽  
Ceramic Coatings ◽  
Atmospheric Plasma ◽  
Wear Rates ◽  
Arc Power ◽  
Plasma Sprayed

MoAlB ceramic coatings were prepared on a 316 steel surface by atmospheric plasma spraying with different arc power levels. The phase composition, microstructure and wear resistance of coatings against GCr15 and Si3N4 counterparts were studied. The MoAlB ceramic decomposed and was oxidized to form MoB and Al2O3 during plasma spraying. With the increase of the arc power, MoAlB experienced more decomposition, but the coatings became denser. When the arc power increased from 30 to 36 kW, the wear rates of coatings against GCr15 and Si3N4 balls reduced by 91% and 78%, respectively. The characterization of wear tracks shows that when against GCr15 counterparts, the main wear mechanisms are abrasive and adhesive wear, and when against Si3N4 counterparts, fatigue and abrasive wear are dominant. The refinement of wear resistance by increasing arc power can be attributed to the improvement of density and adhesive strength among splats.

Characterization of atmospheric plasma-sprayed Sc2O3–ZrO2 electrolyte coating

2006 ◽  
Vol 177 (19-25) ◽  
pp. 2149-2153 ◽  
Author(s):  
C LI ◽  
C LI ◽  
H LONG ◽  
Y XING ◽  
X NING ◽  
...  
Keyword(s):  
Atmospheric Plasma ◽  
Plasma Sprayed

Liquid-phase sintering of BN doped Fe-Cu/TiC composites

1996 ◽  
Vol 54 ◽  
pp. 666-667
Author(s):  
Nuri Durlu ◽  
Nan Yao ◽  
David L. Milius ◽  
Ilhan A. Aksay
Keyword(s):  
Wear Resistance ◽  
Liquid Phase ◽  
Hot Pressing ◽  
Liquid Phase Sintering ◽  
Electron Microscopic ◽  
Hard Particles ◽  
Cu Alloys ◽  
The Matrix ◽  
Full Densification

Fe-Cu composites are commonly produced by liquid phase sintering (above the melting temperature of Cu, 1085°C). The wear resistance of these Fe-Cu alloys can be enhanced by introducing hard particles, e.g., TiC, into the matrix. In such cases, however, the densification of Fe-Cu/TiC composites by liquid phase sintering becomes difficult mainly due to the high wetting angle (110° at 1100-1200°C in argon) of liquid Cu with TiC particles. Especially when the amount of the TiC phase is high enough to form a continuous network of TiC grains, full densification is only achieved through hot pressing. We have recently overcome this problem in an [(Fe-4 wt% Cu) + 30 wt% TiC] composite by the addition of small amounts of BN. Composites with BN additives have been successfully sintered at 1275°C under vacuum or argon by additions of 1 wt% BN. Electron microscopic characterization of these composites has shown that this success is due to the modification of the liquid phase by the addition of BN, which also promotes the liquid phase sintering of the TiC phase.

scholarly journals The Microstructure and Selected Mechanical Properties of Al2O3 + 13 wt % TiO2 Plasma Sprayed Coatings

Coatings ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 173 ◽  
Author(s):  
Monika Michalak ◽  
Leszek Łatka ◽  
Paweł Sokołowski ◽  
Aneta Niemiec ◽  
Andrzej Ambroziak
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Phase Composition ◽  
Atmospheric Plasma ◽  
Dry Sliding Wear ◽  
Coating Morphology ◽  
Coating Microstructure ◽  
Tio2 Coatings ◽  
Feedstock Preparation ◽  
Plasma Sprayed

The Al2O3 + TiO2 coatings are of the interest of surface technology and tribology due to their good wear resistance and enhanced toughness comparing to pure Al2O3 coatings. However, the detailed effect of the used feedstock powder, is often neglected. Here, this work focuses on the deposition of Al2O3 + 13 wt % TiO2 coatings by atmospheric plasma spraying (APS) method as well as on their microstructure, phase composition and selected mechanical properties, in the reference to the route of the powder feedstock preparation. The commercial powder Metco 6221 in agglomerated and sintered form was used as a feedstock material during spraying, due to the fact that, so far, sintered or cladded powders are the most studied ones. The 2k + 1 spray experiment allowed to evaluate the influence of two variables, namely spray distance and torch linear velocity, on the coating microstructure. Afterwards, the coating adhesion was measured by the means of pull-off test. The correlations between Vickers microhardness, fracture toughness (Kc) as well as the coating morphology and phase composition were investigated. Finally, the dry sliding wear resistance was studied by using Ball-on-Disc method.

Determination of Abrasive Wear Resistance of Plasma Sprayed Coatings on Stainless Steel Substrate

2015 ◽  
Vol 766-767 ◽  
pp. 579-584 ◽  
Author(s):  
A. Anderson
Keyword(s):  
Stainless Steel ◽  
Wear Resistance ◽  
Abrasive Wear ◽  
Steel Substrate ◽  
Ceramic Coatings ◽  
Atmospheric Plasma ◽  
Wear Behaviour ◽  
Coating Materials ◽  
Plasma Sprayed Coatings ◽  
Plasma Sprayed

A relative study among various types of coating materials to develop wear resistance of stainless steel has been performed. Ceramic coatings with the thickness up to 250 μm were prepared by Atmospheric plasma spray technique on the stainless steel. Two different types of coating materials such that Yttria Stabilised Zirconia, Zirconia Ceria powder were used. The influence of Ceria powder on abrasive wear was determined. It was found that the addition of Ceria to Yttria Stabilised Zirconia in a sufficient amount helped in increasing its wear resistance compared to the wear behaviour of pure Yttria Stabilised Zirconia powder. Moreover, it was found that the lesser the surface roughness of the coating layer,.

Creation of Diamond/Molybdenum Composite Coating in Open Air

2007 ◽  
Vol 534-536 ◽  
pp. 1097-1100 ◽  
Author(s):  
Yasutaka Ando ◽  
Shogo Tobe ◽  
Hirokazu Tahara
Keyword(s):  
Wear Resistance ◽  
Chemical Vapor ◽  
Atmospheric Plasma ◽  
Molybdenum Coating ◽  
Diamond Particles ◽  
Sprayed Coating ◽  
Plasma Sprayed ◽  
Improve Wear Resistance ◽  
Coating Diamond ◽  
Peeling Off

In order to improve wear resistance of atmospheric thermal plasma sprayed molybdenum (Mo) coating, diamond deposition on the atmospheric plasma sprayed molybdenum coating by the combustion flame chemical vapor deposition (CFCVD) has been operated. Although diamond particles could be deposited on the molybdenum coating, the coating was fractured and peeling off due to thermal influencesin our previous study. In this study, to diminish the thermal damage of the substrate during operation, a thermal insulator was equipped between substrate and water-cooled substrate holder. Consequently, diamond particles could be created on the Mo coating without fracture and peeling off. From these results, it was found that this process had a high potential in order to improve wear resistance of thermal sprayed coating.

Manufacture and Characterization of Particle Reinforced Aluminum Coatings

1996 ◽  
Author(s):  
B. Wielage ◽  
M. Zschunke ◽  
A. Henker ◽  
S. Steinhäuser
Keyword(s):  
Wear Resistance ◽  
Aluminum Alloys ◽  
Fatigue Wear ◽  
Vacuum Plasma Spraying ◽  
Aluminum Coatings ◽  
Vacuum Plasma ◽  
Oxide Particles ◽  
Short Time ◽  
Thermally Sprayed

Abstract For reasons of the decrease in weight in the industry light cage design materials like aluminum alloys are frequently used. Because the wear resistance of aluminum alloys and/or aluminum generally is not sufficient, an increased wear resistance can be reached by means of particle reinforced aluminum coatings. The installation of ceramic reinforcing components (for example oxide particles) in the ductile metal matrix brings an essential improvement of the wear resistance particularly with regard to abrasion and short time fatigue wear. The results presented in the paper refer to research works concerning thermally sprayed Al - coatings with Al2O3- and SiC - particles as reinforcement components by vacuum plasma spraying.

scholarly journals Microstructure and Properties of Atmospheric Plasma Sprayed (Al,Cr)2O3–TiO2 Coatings from Blends

2021 ◽  
Author(s):  
Maximilian Grimm ◽  
Susan Conze ◽  
Lutz-Michael Berger ◽  
Rico Drehmann ◽  
Thomas Lampke
Keyword(s):  
Solid Solution ◽  
Wear Resistance ◽  
Sliding Wear ◽  
Atmospheric Plasma ◽  
Coating Properties ◽  
High Corrosion Resistance ◽  
Abrasion Wear ◽  
Small Change ◽  
Plasma Sprayed ◽  
Insulating Properties

AbstractCoatings prepared from chromia-rich (Al,Cr)2O3 solid solution (ss) feedstock powders are intended to improve the properties of Cr2O3 coatings, but are rarely studied so far. In this work, the processability of a commercial (Al,Cr)2O3 solid solution (ss) powder containing 78 wt.% Cr2O3 by atmospheric plasma spraying (APS), the corresponding coating microstructures and properties were investigated. Possible further improvements were expected by blending with 2, 23 and 54 wt.% TiOx powder. For comparison, plain Cr2O3 and TiOx coatings were studied as well. The microstructures were analyzed using SEM, EDS and XRD measurements. Hardness (HV0.3) was measured, as well as the dry unidirectional sliding wear resistance and the abrasion wear resistance (ASTM G65). Moreover, the corrosion and electrical insulating properties were measured. The (Al,Cr)2O3 ss showed only a small change of the composition, and the formation of γ-Al2O3, as found for alumina-rich (Al,Cr)2O3 ss powders, was avoided. Compared to the plain chromia coating, some improvements of the processability and coating properties for the ss (Al,Cr)2O3 coating were found. The most balanced coating performance was achieved by blending the ss (Al,Cr)2O3 with 2 wt.% TiOx, as this coating showed both a high sliding and abrasion wear resistance, in combination with a high corrosion resistance.

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