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vu, duong
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Experiment Evaluation on the Porosity of Plasma Coating from Ceramic Al2O3 – TiO2 Using the Metallography vu, duong; Hung , Ha Minh
SPEKTA (Jurnal Pengabdian Kepada Masyarakat : Teknologi dan Aplikasi) Vol. 5 No. 1 (2024)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/spekta.v5i1.9133

Abstract

Background: The objective of this paper is an experimental investigation of the metallographic porosity of plasma coating using standard materials from the ceramic system Al2O3-TiO2 on the substrate of steel SS400 at laboratory scale Lab at the Research Institute of Mechanical Engineering. Contribution: The main contribution of the research is the evaluation of the porosity of the coating under the influence of the main technological parameters since the porosity plays a significant role in the performance of the working surface using the built-in Image Pro-Analyzer software in the Axiovert 25 MAT microscope. Method: The spraying material is Al2O3-TiO2 powder. The input parameters are: spraying distance (Lp; current of plasma stream (Ip); powder feed flow (Gp and spraying rate (Vp). Results: The findings show that the average porosity of the Al2O3-TiO2 plasma coating is inversely decreasing in the increasing direction of the distance: spray in the range Lp = 100–200 mm, increase proportional to the increase of the current plasma flow rate in the range Ip = 400–600 A, provided that the powder feed flow Gp = 1.7 kg/h and the spraying rate Vp = 50 mm/min. Conclusion: The degree of influence of the three main technological parameters (Lp, Ip, and Gp) in the survey limit domain may be due to the selected Lp spray distance within the relatively wide recommended range of the plasma spraying equipment supplier. It is recommended to conduct the experimental planning of the L27 type to localize the optimum area.
Predictive Modeling of Porosity in Al₂O₃–TiO₂ Ceramic Coatings Produced by Plasma Spraying Vu, Duong; Minh Hung, Ha
SPEKTA (Jurnal Pengabdian Kepada Masyarakat : Teknologi dan Aplikasi) Vol. 6 No. 1 (2025)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/spekta.v6i1.10985

Abstract

Background: Plasma spraying is a proven technique for applying ceramic coatings to enhance the mechanical and chemical resistance of components exposed to abrasive and corrosive environments. However, controlling coating porosity remains a critical factor that directly affects the coating's performance and lifespan. Contribution: This study contributes to the field by developing a predictive model that quantifies the influence of key plasma spraying parameters on the porosity of Al₂O₃–TiO₂ coatings. The model enables process optimization and quality control for applications requiring high-performance surface protection. Method: An orthogonal experimental design (N27) was implemented to systematically vary three process parameters: spray distance (Lp), plasma current intensity (Ip), and powder feed rate (Gp). A total of 27 coating samples were produced and analyzed. Results: The resulting porosity ranged from 5.96% to 14.52% depending on parameter combinations. The developed second-order polynomial regression model demonstrated good predictive accuracy, with deviation between measured and predicted values ranging from −8.67% to +13.96%, and typically within acceptable engineering limits. Conclusion: The findings confirm that process parameters significantly affect coating porosity, and that the proposed model is a useful tool for optimizing plasma spray operations.
Co-Authors Hung , Ha Minh Minh Hung, Ha