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A Possibility to Improve Resistance of Cast-iron Wood Chip Fine Grinder Liners to Abrasive Wear

A.W. Orłowicz M. Mróz M. Tupaj B. Kupiec M. Jacek M. Radoń
Archives of Foundry Engineering | 2018 | vol.18 | No 4 | 35-38
Keywords Ductile cast iron WCCoCr coating microstructure Scratch test
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Abstract

The paper deals with the issue of potential for improvement of resistance of wood chip fine grinders to abrasive wear by providing them with WCCoCr coating applied with the use of atmospheric plasma spraying (APS). The study focused on establishing parameters of the technological process of spraying a 250–270 μm thick coating onto surface of ductile cast iron castings used to date as grinder linings. The presented data include results of microstructure examination, chemical composition analysis, HV hardness measurements, and scratch tests for both previous and new variant of linings. The obtained scratch test results indicate that the material of the coating is characterized with definitely lower susceptibility to scratching. The scratch made on coating was 75–84 μm wide and 7.2–8.2 μm deep, while the scratch on cast iron was distinctly wider (200–220 μm) and deeper (8.5–12.8 μm). In case of cast iron, the range of variability in scratch width and depth was definitely larger. This can be explained with large difference in hardness of individual components of microstructure of cast iron and significantly larger plastic deformation of cast iron compared to the coating revealed in the course of indenter motion over surfaces of the two materials. It has been found that application of WCCoCr coating offered better resistance of lining surfaces to scratching which can be considered a rationale for undertaking in-service tests.

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Authors and Affiliations

A.W. Orłowicz
M. Mróz
M. Tupaj
B. Kupiec
M. Jacek
M. Radoń

Evaluation of the Possibility to Improve the Scratch Resistance of the AZ91 Alloy by Applying a Coating

Marek Mróz Sylwia Olszewska Patryk Rąb
Archives of Foundry Engineering | 2023 | vol. 23 | No 4 | 157-162 | DOI: 10.24425/afe.2023.146690
Keywords AZ91 magnesium alloy WCCoCr coating Microstructure Scratch test
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Abstract

This paper presents the possibility of improving the scratch resistance of the AZ91 magnesium alloy by applying a WCCoCr coating using the Air Plasma Spraying (APS) method. The coating thickness ranged from 140 to 160 m. Microstructural studies of the AZ91 magnesium alloy were performed. The chemical composition of the WCCoCr powder was investigated. The quality of the bond at the substrate–coating interface was assessed and a microanalysis of the chemical composition of the coating was conducted. The scratch resistance of the AZ91 alloy and the WCCoCr coating was determined. The scratch resistance of the WCCoCr powder-based coating is much higher than the AZ91 alloy, as confirmed by scratch geometry measurements. The scratch width in the coating was almost three times smaller compared to the scratch in the substrate. Observations of the substrate–coating interface in the scratch area indicate no discontinuities. The absence of microcracks and delamination at the transition of the scratch from the substrate to the coating indicates good adhesion. On the basis of the study, it was found that there was great potential to use the WCCoCr powder coating to improve the abrasion resistance of castings made from the AZ91 alloy.
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Bibliography

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Authors and Affiliations

Marek Mróz
1
ORCID: ORCID
Sylwia Olszewska
1
ORCID: ORCID
Patryk Rąb
1
ORCID: ORCID
  1. Rzeszow University of Technology, Poland

Research into the Structure and Adhesion of WCCoCr Coatings Plasma-Sprayed onto Castings of AlSi Alloy Plates

M. Radoń Z. Opiekun B. Kupiec
Archives of Foundry Engineering | 2024 | Accepted articles | DOI: 10.24425/afe.2024.151294
Keywords WCCoCr coatings Aluminium cast alloy Atmospheric plasma spraying
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Abstract

The article presents structural investigations and mechanical properties of hard coatings deposited by spraying WCCoCr powder in an argon-hydrogen plasma jet onto the surfaces of AlSi10Mg alloy casting plates. Two variants (A and B) of processing parameters of the powder spraying process onto the surface of silumin plates were applied, resulting in different coating thickness. The coating applied according to variant A was done with 12 passes, and its thickness was approximately 150 μm. The coating applied according to variant B was done with 20 passes, and its thickness was about 320 μm. The microstructures of these coatings are similar, consisting of wavy, alternately deposited phases of solid solutions with varying concentrations of elements, and fine spherical phases, irregularly dispersed carbides. A qualitative analysis of the distribution of microstructure components was performed based on surface mapping. Precipitates differing in their degree of grayness and shape were identified based on microanalysis of their chemical composition. The porosity assessment of coatings performed in five randomly selected areas amounts to an average of 9%. The applied coatings exhibit good adhesion to the substrate, as evidenced by the absence of delamination during scratching tests using a diamond Rockwell indenter loaded with a force of 10 N. The coating hardness averaged 1180HV0.2. The test results indicate the high quality of the WCCoCr coatings, regardless of their thickness.
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Bibliography


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[12] Reghu, V.R., Shankar, V. & Ramaswamy, P. (2018). Challenges in plasma spraying of 8% Y2O3-ZrO2 thermal barrier coatings on al alloy automotive piston and influence of vibration and thermal fatigue on coating characteristics. Materials Today: Proceedings. 5(11), 23927-23936. DOI: 10.1016/j.matpr.2018.10.185.

[13] Reghu, V.R., Lobo, K., Basha, A., Tilleti, P., Shankar, V. & Ramaswamy, P. (2019). Protection offered by thermal barrier coatings to Al-Si alloys at high temperatures–A microstructural investigation. Materials Today: Proceedings. 19(2), 676-681. DOI: 10.1016/j.matpr.2019.07.752.

[14] Pulsford, J., Venturi, F., Pala, Z., Kamnis, S. & Hussain, T. (2019). Application of HVOF WC-Co-Cr coatings on the internal surface of small cylinders: Effect of internal diameter on the wear resistance. Wear. 432-433, 202965. DOI: 10.1016/j.wear.2019.202965.

[15] Jonda, E., Łatka L., Lont A., Gołombek K., Szala M. (2024). The effect of HVOF spray distance on solid particle erosion resistance of WC-based cermets bonded by Co, Co-Cr and Ni deposited on mg-alloy substrate. Advances in Science and Technology Research Journal. 18(2), 115-128. DOI: https://doi.org/10.12913/22998624/184025.

[16] Akkaş M. (2020). The mechanical and corrosion properties of WCCo–Al coatings formed on AA2024 using the HVOF method. Material Research Express. 7(7), 076515, 1-18. DOI 10.1088/2053-1591/ab9fba.

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Authors and Affiliations

M. Radoń
1
ORCID: ORCID
Z. Opiekun
1
B. Kupiec
1
  1. Rzeszow University of Technology, Al. Powstańców Warszawy 12, 35-959 Rzeszów, Poland

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