激光表面处理Ti13Nb13Zr合金MWCNTs涂层的组织和力学性能

IF 1.5 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Advances in Materials Science Pub Date : 2021-12-01 DOI:10.2478/adms-2021-0021
B. Majkowska-Marzec, Joanna Sypniewska
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引用次数: 5

摘要

摘要钛合金激光表面改性是改善钛合金种植体性能的主要方法之一。研究了电泳沉积碳纳米管涂层前后Ti13Nb13Zr合金表面激光修饰层的微观组织形态。在激光功率分别为800 W和900 W、扫描速率分别为3 mm/s和6 mm/s、25 Hz、脉冲持续时间分别为2.25 ms和3.25 ms的条件下,对未涂覆碳纳米管的样品进行激光修饰。利用扫描电子显微镜(SEM)对改性后样品的表面结构进行了表征。为了观察单个样品的热影响区,取金相样品并在光学显微镜下观察。表面润湿性测试使用角计进行。使用轮廓仪进行表面粗糙度测试,并使用NanoTest™Vantage进行纳米压痕测试。对微观结构的观察表明,在较高的激光功率下,样品的表面更均匀,没有缺陷,而在较低的激光功率下,激光束的路径更清晰,更有规则。结果表明,碳纳米管涂层的热影响区较宽,在800 W、3 mm/s的进料速率下改性后,热影响区最宽。润湿性测试表明,所有样品表面均表现出亲水性,而碳纳米管涂层进一步增强了样品的亲水性。表面粗糙度测试表明,激光修饰样品的Ra含量显著增加,碳纳米管的存在进一步增加了该值。纳米压痕研究表明,激光改性和碳涂层的存在改善了样品的力学性能,这是由于它们的强度。
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Microstructure and Mechanical Properties of Laser Surface-Treated Ti13Nb13Zr Alloy with MWCNTs Coatings
Abstract Laser surface modification of titanium alloys is one of the main methods of improving the properties of titanium alloys used in implantology. This study investigates the microstructural morphology of a laser-modified surface layer on a Ti13Nb13Zr alloy with and without a carbon nanotube coating deposited by electrophoretic deposition. Laser modification was performed for samples with and without carbon nanotube coating for two different laser powers of 800 W and 900 W and for different scan rates: 3 mm/s or 6 mm/s at 25 Hz, and the pulse duration was 2.25 ms or 3.25 ms. A scanning electron microscope SEM was used to evaluate the surface structure of the modified samples. To observe the heat-affected zones of the individual samples, metallographic samples were taken and observed under an optical microscope. Surface wettability tests were performed using a goniometer. A surface roughness test using a profilograph and a nanoindentation test by NanoTest™ Vantage was also performed. Observations of the microstructure allowed to state that for higher laser powers the surfaces of the samples are more homogeneous without defects, while for lower laser powers the path of the laser beam is clearer and more regular. Examination of the microstructure of the cross-sections indicated that the samples on which the carbon nanotube coating was deposited are characterized by a wider heat affected zone, and for the samples modified at 800 W and a feed rate of 3 mm/s the widest heat affected zone is observed. The wettability tests revealed that all the samples exhibit hydrophilic surfaces and the samples with deposited carbon nanotube coating increase it further. Surface roughness testing showed a significant increase in Ra for the laser-modified samples, and the presence of carbon nanotubes further increased this value. Nanoindentation studies showed that the laser modification and the presence of carbon coating improved the mechanical properties of the samples due to their strength.
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Advances in Materials Science
Advances in Materials Science MATERIALS SCIENCE, MULTIDISCIPLINARY-
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