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Manufacture of MoO3 Coating Layer Using Thermal Spray Process and Analysis of Microstructure and Properties

Hwang Yu-Jin, Kim Kyu-Sik, Park Jae-Sung, Lee Kee-Ahn

Archives of Metallurgy and Materials

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2022

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Vol. 67, iss. 4

1535--1538

EN

MoO3 thick film was manufactured by using a thermal spray process (Atmospheric Plasma Spray, or APS) and its micro-structure, phase composition and properties of the coating layer were investigated. Initial powder feedstock was composed of an orthorhombic α-MoO3 phase, and the average powder particle size was 6.7 μm. As a result of the APS coating process, a MoO3 coating layer with a thickness of about 90 μm was obtained. Phase transformation occurred during the process, and the coating layer consisted of not only α-MoO3 but also β-MoO3, MoO2. Phase transformation could be due to the rapid cooling that occurred during the process. The properties of the coating layer were evaluated using a nano indentation test. Hardness and reduced modulus were obtained as 0.47 GPa and 1.4 GPa, respectively. Based on the above results, the possibility of manufacturing a MoO3 thick coating layer using thermal spray is presented.

2

Cavitation erosion and sliding wear of MCrAlY and NiCrMo coatings deposited by HVOF thermal spraying

Szala M., Walczak M., Łatka L., Gancarczyk K., Özkan D.

Advances in Materials Science

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2020

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Vol. 20, nr 2(64)

26--38

EN

The investigation into wear resistance is an up-to-date problem from the point of view of both scientific and engineering practice. In this study, HVOF coatings such as MCrAlY (CoNiCrAlY and NiCoCrAlY) and NiCrMo were deposited on AISI 310 (X15CrNi25-20) stainless steel substrates. The microstructural properties and surface morphology of the as-sprayed coatings were examined. Cavitation erosion tests were conducted using the vibratory method in accordance with the ASTM G32 standard. Sliding wear was examined with the use of a ball-on-disc tribometer, and friction coefficients were measured. The sliding and cavitation wear mechanisms were identified with the SEM-EDS method. In comparison to the NiCrMo coating, the MCrAlY coatings have lower wear resistance. The cavitation erosion resistance of the as-sprayed M(Co,Ni)CrAlY coatings is almost two times lower than that of the as-sprayed NiCrMoFeCo deposit. Moreover, the sliding wear resistance increases with increasing the nickel content as follows: CoNiCrAlY < NiCoCrAlY < NiCrMoFeCo. The mean friction coefficient of CoNiCrAlY coating equals of 0.873, which almost 50% exceed those reported for coating NiCrMoFeCo of 0.573. The as-sprayed NiCrMoFeCo coating presents superior sliding wear and cavitation erosion resistance to the as-sprayed MCrAlY (CoNiCrAlY and NiCoCrAlY) coatings.

3

Strumieniowo-ścierne przygotowanie podłoża stalowego przed natryskiem cieplnym

Marcinkowski M.

Przegląd Spawalnictwa

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2017

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R. 89, nr 4

22--27

4

Modeling residual stresses generated in Ti coatings thermally sprayed on Al2O3 substrates

Zimmerman J., Lindemann Z., Golański D., Chmielewski T., Włosiński W.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2013

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Vol. 61, nr 2

515--525

EN

There is described a method of modeling by the finite element method the residual stresses induced during thermal deposition of coatings. The simulation was performed in two stages. The first dynamic stage simulated the impacts of the individual particles of the coating material onto the substrate, and the next static stage included a non-linear thermo-mechanical analysis intended for simulating the process of layer-by-layer deposition of the coating, with a specified thickness, and then cooling the entire system to the ambient temperature. In the computations, the samples were assumed to be cylindrical in shape and composed of an Al2O3 substrate and a titanium coating (with three different thicknesses) deposited using the detonation method. The correctness of the numerical model was verified experimentally by measuring the deflections of a real Ti coating/Al2O3 substrate sample with the Ti coating detonation-sprayed on the ceramic substrate, after cooling it to the ambient temperature. The experimental results appeared to be in good agreement with those obtained by the numerical computations.

5

Przygotowanie podłoża do natryskiwania cieplnego

Schürholt G.

Przegląd Spawalnictwa

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2009

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R. 81, nr 12

43-47

PL

Przedstawiono przygotowanie powierzchni podłoża przez oczyszczanie strumieniowo-ścierne za pomocą różnych materiałów ściernych. Przeprowadzono analizę kształtu, wielkości ziarna i zanieczyszczeń w takich materiałach ściernych jak: węglik krzemu, korund standardowy, szlachetny i z dodatkiem tlenku cyrkonu oraz środek AI203-Si02. Skuteczność danego środka ściernego określano na podstawie analizy chropowatości powierzchni, skłonności do wypełniania zagłębień na powierzchni podłoża oraz skłonności do rozkruszania i powstawania pyłu.

EN

Preparation of substrate surface by means of abrasive cleaning using different abrasives was presented. Analysis of shape, size of abrasive particles and contaminations in such abrasives as: silicon carbide, standard corundum, noble corundum and with additive of zirconium oxide as well as Al203-Si02 was made. Efficiency of a given abrasive was determined on the basis of surface roughness, susceptibility to filling of pits in a substrate surface as well as susceptibility to crumbling and dust formation.