Abstract:Abstract: In order to prevent the luminescence quenching of rare earth phosphor in composite coatings, the sol-gel method was used to preparate SiO2-SrAl2O4:Eu2+,Dy3+ coated powders. The Cu-14Al-X/SrAl2O4 composite coatings were preparated on the 45 steel substrate by cold spray technology, and the friction and wear condition of the coatings were monitored by luminescence.The SiO2-SrAl2O4 powder was characterized by SEM and laser particle size analysis, combined with EDS and F97 Pro fluorescence spectrophotometer ,to study and detect coating’s microstructure, microcomponent and luminescence properties. The luminescence quenching mechanism of phosphor powder and SiO2 coating process effect of anti quenching in cold spray process were explored. The results show that contacting between rare earth phosphor and Fe, Mn, Ni elements and high speed impact of spray particles on each other are the main causes of the luminescence quenching of the cold spray coating. The preparation of SiO2-SrAl2O4 coating powder can be realized by sol-gel method, which can form the SiO2 shell structure that could optimize the surface morphology of the powder，make the powder smoothly and roundly, improve the powder’s hardness, have a good microstracture transition, get a better light-emitting property.