As an effective and economical surface strengthening method, flame spray technology is now widely used in surface shielding of engineering materials and equipments or parts repairments. However, the porosities inside the coating and the poor bonding of the coating strength with As an effective and economical surface strengthening method, flame spray technology is now widely used in surface shielding of engineering materials and equipments or parts repairments. However, the porosities inside the coating and the poor bonding of the coating strength with