HVAF喷涂铁基非晶涂层工艺优化  

HVAF Process Optimization for Spraying Fe-based Amorphous Coating

作　　者：李春 杜宝宪[1] 张玉鑫 杜欣蔚 张子昌[1] 倪立勇[1] 曲栋 杨震晓[1] Li Chun;Du Baoxian;Zhang Yuxin;Du Xinwei;Zhang Zichang;Ni Liyong;Qu Dong;Yang Zhenxiao(Institute of Aerospace Materials and Processing Technology,Beijing 100076,China;Capital Aerospace Machinery Corporation,Beijing 100076,China)

机构地区：[1]航天材料及工艺研究所,北京100176 [2]首都航天机械有限公司,北京100176

出　　处：《热喷涂技术》2023年第3期19-28,共10页Thermal Spray Technology

基　　金：国家自然科学基金面上项目(52371044)。

摘　　要：铁基非晶材料具有优异的耐蚀性和耐磨性,空气/丙烷超音速火焰喷涂(HVAF)技术制备铁基非晶涂层近年来引起了广泛关注。由于铁基非晶粉在高温下粘度较大,很容易造成喷枪堵塞,制约了该技术的工程应用。通过在铁基非晶粉末中掺入10 wt.%~20 wt.%的180目白刚玉砂,缓解喷枪堵塞、改善涂层的喷涂稳定性。研究了白刚玉含量、喷涂气体压力、送粉速率、喷涂距离等对涂层沉积效率、抗拉结合强度、孔隙率及粘枪情况的影响规律。结果表明,Fe基粉/白刚玉复合粉喷涂可以实现20 min以上的稳定喷涂,且制备的涂层结合强度达到40 MPa以上,涂层孔隙率<1%,涂层粘枪情况得到显著改善。优化出了适用于铁基非晶粉HVAF喷涂的工艺方法,能够指导该技术的推广应用。Fe-based amorphous material maintains supreme wear and corrosion resistance,and the preparation of Fe-based amorphous coatings via High Velocity Air Fuel Spraying(HVAF,air/propane)technology has attracted considerable attention in recent years.Due to the very high velocity of the melted Fe-based amorphous powder,it is easy to cause gun blockage,which limits the engineering application of this technology.In this research,10 wt.%~20 wt.%white corundum sand with a size of 180-mesh was added into the Fe-based amorphous powder to improve the spray stability of the coating.The effects of white corundum sand content,spraying gas pressure,powder feeding rate,and the stand-off distance on the deposition efficiency,tensile bonding strength,porosity rate of the coating,and the gun blockage condition were studied.Results show that composite powder composed of Fe-based powder and white corundum sand are helpful to achieve stable spraying for more than 20 min.The as-sprayed coating has a bonding strength of more than 40 MPa,porosity of less than 1%,and a significant improvement in gun blockage.HVAF process method suitable for spraying of Fe-based amorphous powder has been optimized in this paper,which can guide the promotion and application of this technology.

关 键 词：铁基非晶 HVAF 复合粉 工艺优化 粘枪 

分 类 号：TG174.4[金属学及工艺—金属表面处理]