Abstract: The method of 3D FEM numerical simulation of coating temperature field during deposition process was introduced in detail. The FEA program Ansys was used in the temperature field calculation. The transfer of heat and mass from metal spray to coating and the heat loss by radiation were taken into account when the mathematical model was put forward. The geometry model was built through the micro-thickness increase of the coatings. In the model,the micro-thickness lamellas were activated gradually to participate in the calculation. Movable boundary condition was used to simulate the practical deposition process. Experiments proved that the calculation results are believable. The influence of deposition rate,coefficient of heat transfer and spraying process on coating temperature field was discussed.
Numerical simulation of temperature field during arc spray coating
Abstract:
The method of 3D FEM numerical simulation of coating temperature field during deposition process was introduced in detail. The FEA program Ansys was used in the temperature field calculation. The transfer of heat and mass from metal spray to coating and the heat loss by radiation were taken into account when the mathematical model was put forward. The geometry model was built through the micro-thickness increase of the coatings. In the model, the micro-thickness lamellas were activated gradually to participate in the calculation. Movable boundary condition was used to simulate the practical deposition process. Experiments proved that the calculation results are believable. The influence of deposition rate, coefficient of heat transfer and spraying process on coating temperature field was discussed.
Fig.1 FEM grid of geometrical model (a) —Wire feeding voltage 15 V, spray distance 14 cm, spray time 20 s; (b) —Wire feeding voltage 15 V, spray distance 18 cm, spray time 26 s
Fig.2 Temperature measurement of interface between coating and substrate (a) —Wire feeding voltage 18 V, spray distance 18 cm, spray time 20 s; (b) —Wire feeding voltage 15 V, spray distance 18 cm, spray time 26 s; (c) —Wire feeding voltage 15 V, spray distance 14 cm, spray time 20 s; (d) —Wire feeding voltage 15 V, spray distance 18 cm, spray time 26 s, epoxy resin substrate
Fig.3 Temperature calculation results of coating interface under different arc spray conditions1—Wire feeding voltage 15 V, spray distance 14 cm, spray time 20 s; 2—Wire feeding voltage 15 V, spray distance 18 cm, spray time 26 s
图4 不同界面传热系数时涂层下表面温度—时间计算曲线
Fig.4 Temperature calculation results of coating interface with different thermal conductivities (Wire feed voltage: 15 V; Spray distance: 18 cm; Spray time: 26 s)
Fig.5 Section of FEM geometrical model of coating and substrate
图6 涂层下表面及截面不同位置节点、 不同时刻的温度分布计算结果
Fig.6 Temperature calculation results under different moment and nodes of coating interface and coating section (Wire feeding voltage: 14 V, Spraying distance: 14 cm; Spray time: 20 s) ○—t=1 s; ◇—t=10 s; □—t=20 s; ●—t=150 s