路广明,乌日开西•艾依提.等离子喷涂TiO2基涂层工艺参数优化研究[J].表面技术,2018,47(4):73-80.
LU Guang-ming,Wurikaixi•Aiyiti.Process Parameter Optimization of Plasma Sprayed TiO2-based Coatings[J].Surface Technology,2018,47(4):73-80
等离子喷涂TiO2基涂层工艺参数优化研究
Process Parameter Optimization of Plasma Sprayed TiO2-based Coatings
投稿时间:2017-11-21  修订日期:2018-04-20
DOI:10.16490/j.cnki.issn.1001-3660.2018.04.011
中文关键词:  TiO2  正交试验  参数优化  等离子喷涂  基材温度  综合性能
英文关键词:TiO2  orthogonal test  parameter optimization  plasma spraying  substrate temperature  overall performance
基金项目:新疆维吾尔自治区自然科学基金项目(2015211C269)
作者单位
路广明 新疆大学 机械工程学院,乌鲁木齐 830047 
乌日开西•艾依提 新疆大学 机械工程学院,乌鲁木齐 830047 
AuthorInstitution
LU Guang-ming School of Mechanical Engineering, Xinjiang University, Urumqi 830047, China 
Wurikaixi•Aiyiti School of Mechanical Engineering, Xinjiang University, Urumqi 830047, China 
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中文摘要:
      目的 对TiO2基涂层的等离子喷涂工艺参数进行优化。方法 采用正交实验、基材温度采集并结合涂层微观形貌分析、能谱分析、结合强度试验、显微硬度测试等方法,研究了喷涂电流、喷涂距离、主气流量对涂层组织及性能的影响规律,并获得了优化的喷涂工艺参数。结果 涂层分熔融区和部分熔融区,呈现双模结构的混合微观结构特征,截面形貌凹凸不平,并以机械结合为主。拉断后,涂层断裂面呈韧窝状,由陶瓷层到粘结层呈台阶状过渡,陶瓷层整体的内聚结合强度优于陶瓷层与粘结层结合界面的结合强度。涂层条带状夹杂随着粉末流到达基板的温度的增加而减少,对结合强度影响不显著,但对硬度影响较显著。等离子喷涂过程中,粉末流到达基板的温度在一定范围内时,涂层性能随着粉末流到达基板的温度的增加而增加,但粉末流到达基板的温度过大,涂层性能降低。结论 获得最优涂层必须采用最优工艺参数,工艺参数对涂层综合性能的影响主次顺序为喷涂电流、喷涂距离、主气流量,得到的优化工艺参数为:喷涂电流350 A,喷涂距离 110 mm,主气流量 2100 L/h。
英文摘要:
      The work aims to optimize plasma spraying parameters for TiO2-based coatings. Law of influence of spraying current, spraying distance and main air flow rate on microstructure and properties of coatings was studied in the methods of orthogonal experiment, substrate temperature collection, coating microstructure analysis, energy spectrum analysis, combined strength test and hardness test, and optimized spraying process parameters were obtained. The sprayed coatings exhibited mixed microstructure characteristic which featured in dual-mode structure in molten zone and partially molten zone. Cross-sectional morphology of the coatings was uneven, and was mainly mechanically bonded. After the samples were pulled apart in tensile test, facture surfaces of the coatings were dimple-shaped, step transition occurred from ceramic layer to adhesive layer, and overall cohesive bonding strength of ceramic layer outperformed bonding strength of bonding interface between the ceramic layer and bonding layer. The coated stripes reduced as the temperature at which powder flow came to the substrate increased, which had significant effects on hardness instead of bonding strength. In the process of plasma spraying, when the temperature at which powder flow came to the substrate fell in certain range, the coating performance increased with the increase of the temperature at which powder flow came to the substrate. However, the coating propermance degraded if the temperature at which powder flow came to the substrate was too high. The optimal process parameters must be used to obtain optimal coatings, main parameters affecting overall performance of coatings are in the order as follows: spraying current, spraying distance and main air flow rate. The obtained optimal process parameters are: spraying current of 350 A, spraying distance of 110 mm, and main air flow rate of 2100 L/h.
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