The high-temperature sintering and ball milling were adopted to prepare SiO2 glass and Cr2O3 ceramic composite powder. The glass-ceramic coating was prepared by using the high-velocity flame spraying on the surface of 45 steel. And laser micro-joining techniques were used as secondary treatment in order to improve its properties. Effect of laser micro-joining on microstructure and properties of glass-ceramic coatings were investigated. The results showed that the laser micro-joining method being taken as the secondary treatment, the compactness of the coating is improved and the coatings becomes more uniform, and the micropores and crack in the glass-ceramic coating are reduced; the bonding strength of the interface, hydrophobic properties and corrosion resistance of the coatings are enhanced obviously. Consequently, the comprehensive performance of the glass-ceramic coatings is dramatically enhanced when laser micro-joining is adopted as the secondary treatment.%采用高温烧结、球磨破碎的方法制备出了SiO2玻璃与Cr2O3陶瓷包覆型玻璃陶瓷复合粉末.利用常规氧—乙炔火焰喷涂技术在45钢基材表面制备出了玻璃陶瓷保护涂层,并使用激光微纳烧结技术对热喷涂层进行二次处理.研究了激光微纳烧结对玻璃陶瓷涂层组织与性能的影响.结果表明,采用激光微纳烧结对玻璃陶瓷涂层进行二次处理,可提高涂层结构的致密性,使组织均匀化,减少涂层中的微孔和微裂纹；明显提高界面的结合强度和涂层的疏水性能与耐蚀性能.因此激光微纳烧结二次处理技术可以显著提高玻璃陶瓷涂层的综合性能.
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