Numerical Simulation of Particle Impacting on Substrate in Low Temperature and High Velocity Oxygen/Air Fuel Spraying Process

摘要

The impact behavior of spraying copper particle on substrate in low temperature and high velocity oxygen/air fuel(LT-HVO/AF) spraying process is studied by using the method of finite element Lagrange analysis, analyzing the relation of particle velocity, deformation behavior and temperature. It is found that impact velocity directly influences the entire impact process and confirmed that there is the critical velocity for particle deposition and adiabatic shear instability of particle which is about 550m/s and 650m/s. As the particle velocity rises, the particle deformation, particle temperature and contact area of particle and substrate increase all increases. When the particle velocity achieves 800m/s, the highest temperature at the interface with particle and substrate achieves or up to the melting point of particle which leads to the metallurgical bonding of the particle with the substrate.