Influence of Process Parameters on HVOF Coating Quality: A Review

Abstract

The application as well as study of HVOF (High-Velocity Oxy-Fuel) coating has been grown recently by many researchers. There have been several researchers approaching the HVOF parameters such as, temperature, oxygen and fuel flow, oxygen and fuel ratio, powder flow rate etc. The more researchers found the relationship between the process parameters to the quality response such as porosity, adhesive strength and oxide content. The understanding of the process parameter to quality improves the qualification process in the more efficient way and lead to the opportunity to explore the dynamic control design during the coating process. While the qualification process that involving the more robust process parameter references improve the quality assurance of the process. This paper summarises the earlier finding in order to identify the relationship of the process parameters to the output quality. It describes the important of maintaining the process parameters as part of the quality assurance. The author are now assisting the qualification process of HVOF coating and the study of the process parameters is aimed to improve the qualification process in the sense of effectively and efficiently.