摘要
传统热喷涂粉末由小颗粒粉体混合团聚制得,流动性差、致密度低,制得的涂层均匀性差、性能不稳定。以有机金属盐为原料,采用溶胶-凝胶法及喷雾干燥法制备出氧化钛质量分数为13%的氧化铝-氧化钛(AT-13)复合前驱体粉末。采用TG-DSC、XRD、FESEM、霍尔流量计研究了粉体反应机理、物相组成、微观结构及流动性能,同时利用维氏硬度计、FESEM-EDS对制得的涂层性能进行了分析比较。结果表明,凝胶经喷雾干燥工艺后可获得球形Ti(OH)4/Al OOH复合粉体,直径约为40μm;与传统团聚粉体相比,前驱体粉末流动性更为优异,为43 s/50 g;由该粉末制得的涂层表面光滑、元素分布均匀、力学性能稳定、耐磨损性能优良,平均显微硬度达873.8 HV0.3,磨损量较团聚粉末涂层减少三分之一。
Owing to poor liquidity and low density of traditional thermal spraying powder, the performance of the as-sprayed coating is poor and unreliable. Using aluminum isopropoxide and tetrabutyl titanate as raw materials, and ethanol/water as solvent, AT-13 precursor thermal spraying powder was prepared by sol-gel method and spray drying. TG-DSC, XRD, FESEM, and Holzer flowmeter were used to study the reaction mechanism, the phase composition and microstructure of the powder. Vickers hardness of the coatings were also analyzed and compared by FESEM-EDS. The results show that the spherical precursor powder is composed by Ti（OH）4 and AlOOH with a diameter of about 40 μm after spray drying. Compared with the commercial AT-13 powder, the flowability of the precursor powder is better for 43 s/50 g. The coating parpared by precursor powder appears smooth surface, uniform element distribution and stable mechanical performance. Its average microhardness reaches 873.8 HV0.3 and the wear weight loss is 1/3 less than that of the agglomerated powder coating.
作者
毛家玮
丁思宇
李永甲
闵捷
曾鲜
程旭东
MAO Jia-wei;DING Si-yu;LI Yong-jia;MIN Jie;ZENG Xian;CHENG Xu-dong(State Key Laboratory of Advanced Technology for Materials Synthesis and Progressing, Wuhan University of Technology, Wuhan 430070;Collaborative Innovation Center for High-efficiency Utilization of Solar Energy, Hubei University of Technology, Wuhan 430070)
出处
《中国表面工程》
EI
CAS
CSCD
北大核心
2018年第3期143-151,共9页
China Surface Engineering
基金
中央高校基本科研业务费专项资金(173101003)
武汉理工大学研究生优秀学位论文培育项目(2016-YS-004)~~
