AC-HVAF非晶和金属陶瓷涂层在压裂液中空蚀行为研究

发布时间：2018-06-01 23:54

本文选题：非晶涂层 + 陶瓷涂层　；参考：《材料导报》2017年16期

【摘要】：采用超声空蚀与电化学测试相结合的方法,对AC-HVAF热喷涂非晶金属和金属陶瓷两种涂层在水力压裂液中的空蚀及交互作用规律进行了研究,分析了耐蚀性和硬度在空蚀时的主导作用,确定了空蚀机理。结果表明,压裂液中KCl恶化了涂层的腐蚀性能,进而影响了空蚀行为。涂层在压裂液中的抗空蚀性能是耐蚀性与硬度结合的双变量函数。空化的力学破坏对高硬度涂层的空蚀过程有显著影响,硬度相对较高的金属陶瓷防护涂层的抗空蚀性能优异。压裂工况下,AC-HVAF涂层空蚀损伤是由于气泡溃灭垂直冲击孔隙或缺陷区域,硬相直接被剥离表面。降低孔隙和提高粘结相结合强度有助于提高涂层在压裂液中的抗空蚀性能。
[Abstract]:The cavitation erosion and interaction of AC-HVAF thermal sprayed amorphous metal and cermet coatings in hydraulic fracturing fluid were studied by means of ultrasonic cavitation erosion and electrochemical measurement. The dominant role of corrosion resistance and hardness in cavitation erosion is analyzed and the cavitation mechanism is determined. The results show that KCl in the fracturing fluid deteriorates the corrosion performance of the coating and then affects the cavitation corrosion behavior. The cavitation corrosion resistance of the coating in fracturing fluid is a bivariate function of the combination of corrosion resistance and hardness. The cavitation failure has a significant effect on the cavitation process of high hardness coatings, and the relatively high hardness cermet coatings have excellent cavitation corrosion resistance. The cavitation erosion damage of AC-HVAF coating under fracturing condition is due to the bubble collapsing the perpendicular impact pore or the defect area and the hard phase is stripped directly from the surface. Decreasing porosity and increasing bonding strength can improve the cavitation corrosion resistance of the coating in fracturing fluid.
【作者单位】：东北石油大学机械科学与工程学院;
【基金】：国家自然科学基金(51401051) 黑龙江省博士后科研启动金(LBH-Q16036)
【分类号】：TE357.12

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