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激光功率水平对Ti6Al4V基体上激光熔覆氟磷灰石/氧化锆复合涂层微观结构性能和相组成的影响

Effects of Laser Power Level on Microstructural Properties and Phase Composition of Laser-Clad Fluorapatite/Zirconia Composite Coatings on Ti6Al4V Substrates.

作者信息

Chien Chi-Sheng, Liu Cheng-Wei, Kuo Tsung-Yuan

机构信息

Department of Orthopaedics, Chimei Foundation Hospital, Tainan 710, Taiwan.

Department of Electrical Engineering, Southern Taiwan University of Science and Technology, Tainan 710, Taiwan.

出版信息

Materials (Basel). 2016 May 17;9(5):380. doi: 10.3390/ma9050380.

Abstract

Hydroxyapatite (HA) is one of the most commonly used materials for the coating of bioceramic titanium (Ti) alloys. However, HA has poor mechanical properties and a low bonding strength. Accordingly, the present study replaces HA with a composite coating material consisting of fluorapatite (FA) and 20 wt % yttria (3 mol %) stabilized zirconia (ZrO₂, 3Y-TZP). The FA/ZrO₂ coatings are deposited on Ti6Al4V substrates using a Nd:YAG laser cladding system with laser powers and travel speeds of 400 W/200 mm/min, 800 W/400 mm/min, and 1200 W/600 mm/min, respectively. The experimental results show that a significant inter-diffusion of the alloying elements occurs between the coating layer (CL) and the transition layer (TL). Consequently, a strong metallurgical bond is formed between them. During the cladding process, the ZrO₂ is completely decomposed, while the FA is partially decomposed. As a result, the CLs of all the specimens consist mainly of FA, Ca₄(PO₄)₂O (TTCP), CaF₂, CaZrO₃, CaTiO₃ and monoclinic phase ZrO₂ (m-ZrO₂), together with a small amount of θ-Al₂O₃. As the laser power is increased, CaO, CaCO₃ and trace amounts of tetragonal phase ZrO₂ (t-ZrO₂) also appear. As the laser power increases from 400 to 800 W, the CL hardness also increases as a result of microstructural refinement and densification. However, at the highest laser power of 1200 W, the CL hardness reduces significantly due to the formation of large amounts of relatively soft CaO and CaCO₃ phase.

摘要

羟基磷灰石(HA)是生物陶瓷钛(Ti)合金涂层最常用的材料之一。然而,HA的机械性能较差且结合强度较低。因此,本研究用由氟磷灰石(FA)和20 wt%氧化钇(3 mol%)稳定氧化锆(ZrO₂,3Y-TZP)组成的复合涂层材料替代HA。使用Nd:YAG激光熔覆系统,分别以400 W/200 mm/min、800 W/400 mm/min和1200 W/600 mm/min的激光功率和行进速度,将FA/ZrO₂涂层沉积在Ti6Al4V基体上。实验结果表明,合金元素在涂层(CL)和过渡层(TL)之间发生了显著的相互扩散。因此,它们之间形成了牢固的冶金结合。在熔覆过程中,ZrO₂完全分解,而FA部分分解。结果,所有试样的CL主要由FA、Ca₄(PO₄)₂O(TTCP)、CaF₂、CaZrO₃、CaTiO₃和单斜相ZrO₂(m-ZrO₂)组成,还有少量的θ-Al₂O₃。随着激光功率的增加,CaO、CaCO₃和微量的四方相ZrO₂(t-ZrO₂)也会出现。当激光功率从400 W增加到800 W时,由于微观结构细化和致密化,CL硬度也随之增加。然而,在1200 W的最高激光功率下,由于形成了大量相对较软的CaO和CaCO₃相,CL硬度显著降低。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/52da/5503073/3ed4779d019f/materials-09-00380-g001.jpg

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