| 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/AlOOH复合粉体，直径约为40 μm；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。 |
| 关键词: 等离子喷涂 AT-13粉末 溶胶-凝胶法 喷雾干燥 |
| DOI：10.11933/j.issn.1007-9289.20171229001 |
| 分类号:TG174.442 |
| 基金项目: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） |
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| Preparation of Plasma Sprayed Al2O3/TiO2 Composite Powder by Sol-Gel Method |
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MAO Jia-wei1, DING Si-yu1, LI Yong-jia1, MIN Jie2, ZENG Xian1, CHENG Xu-dong1
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1.State Key Laboratory of Advanced Technology for Materials Synthesis and Progressing, Wuhan University of Technology, Wuhan 430070;2.Collaborative Innovation Center for High-efficiency Utilization of Solar Energy, Hubei University of Technology, Wuhan 430070
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| Abstract: |
| 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. |
| Key words: plasma spraying AT-13 powder sol-gel method spray drying |
