Supersonic Flame Thermal Spray Equipment and Process

Description

High-velocity oxy-fuel (HVOF) thermal spraying is an advanced surface coating technology. The core process utilizes a high-pressure combustion chamber to mix and burn fuel with oxygen, generating high-temperature, high-pressure combustion gas flows, which are then accelerated to supersonic speeds through a specially designed Laval nozzle. Metal or ceramic powders are injected axially or radially into the high-speed jet, instantly heated to a molten or semi-molten state, and propelled at extremely high velocities to impact the substrate surface, forming a dense, high-bond-strength quality coating. The core equipment is the HVOF spray gun system, including: - Combustion chamber and nozzle: key components for generating and accelerating the supersonic jet; - Powder feeding system: precisely controls powder delivery rate and injection position; - Fuel and gas control unit: precisely regulates flow rates and pressures of fuel, oxygen, and powder carrier gas; - Cooling system: typically water-cooled to prevent gun overheating; - Robot or motion mechanism: achieves precise, stable movement of the gun relative to the workpiece.