Authors: Nguyen Thanh Phu, Dinh Van Chien, Dao Duy Trung, Pham Van Lieu, Nguyen Chi Bao, Doan Thanh Hoa

Published in: The 5th National Conference on Mechanical Science and Technology (VCME 2018). ISBN 978-604-67-1103-2

Publication date: 10/2018

Abstract: The adhesion strength of thermal spray coatings plays a decisive role in the working life of components under wear conditions. In addition to factors related to material properties, spray process parameters greatly influence the adhesion of the coating to the substrate metal. This paper presents the results of optimizing HVOF (High Velocity Oxy-Fuel) spray parameters including: spray feed rate (A), spray distance (B), and the ratio of the combustible gas mixture between Oxygen and Propane (C) on the adhesion strength of WC-12Co coating on 16Mn steel substrate using the Taguchi method and ANOVA (Analysis of variance) technique. The results show that with parameters A = 32 g/min, B = 0.275 m, C = 5, the coating achieves the highest adhesion strength, and the level of influence of the factors on adhesion strength is B > C > A. The subsequent verification experiment results were compared with the optimal value and yielded an error of 0.5%. Thus, it can be confirmed that the optimization result is reliable. In addition, a mathematical regression function expressing the relationship between adhesion strength and spray parameters was found, which allows predicting the adhesion strength value based on spray parameters.

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