Centrala begrepp
Generalized linear models with gamma regression and maximum likelihood estimation can accurately model and predict critical target variables in high-velocity oxygen fuel (HVOF) thermal spray coating processes.
Sammanfattning
The paper proposes a framework for modeling and predicting critical target variables in thermal spray coating processes, based on the application of statistical design of experiments (DoE) and the modeling of the data using generalized linear models (GLMs) and gamma regression.
Key highlights:
- The HVOF thermal spray coating process is a sophisticated and intricate technique that relies on the combined kinetic and thermal energy of the sprayed particles to produce coatings with exceptional properties.
- Predicting coating properties is challenging due to the complex and non-linear nature of the relationships between process parameters and coating properties.
- The study employs a Central Composite Design (CCD) of experiments to efficiently explore a vast parameter space, including factors such as powder feed rate, stand-off distance, stoichiometric ratio, coating velocity, and total gas flow.
- Generalized linear models (GLMs) with gamma regression and maximum likelihood estimation are used to model the intricate relationships between the process parameters and the coating properties.
- The proposed framework demonstrates the ability to accurately model and predict critical target variables and their intricate relationships, supporting the development of efficient coating technologies with enhanced attributes.
- The findings highlight the potential of the framework for the optimization of thermal spray coating processes and the development of more effective coating technologies in various industries.
Statistik
The powder used for the spraying process was an agglomerated sintered tungsten carbide powder (WC-Co).
Steel plates of type 1.4404 were used as the substrate material.
The HVOF coatings were produced using an Oerlikon Metco thermal spraying equipment, namely the DJ 2700 gas-fuel HVOF system with water-cooled gun assembly.
The fuel gas used for these tests was propane.
Citat
"Thermal spraying is a surface modification process that involves the deposition of a coating material onto a substrate by heating and accelerating a feedstock material through a spray gun."
"The high-velocity oxygen fuel (HVOF) spraying technique, schematically depicted in Figure 2.1, represents a sophisticated and intricate thermal spray process that relies on the combined kinetic and thermal energy of the sprayed particles to produce coatings with exceptional properties, which makes it a subject of great interest and ongoing research in the field of materials engineering."
"Despite the notable progress, the prediction of coating properties is still a challenging task, due to the intricate interactions among the process variables, material properties, and the microstructure of the coatings."