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Investigations on achievable surface quality in milling of Ti-35Nb-7Zr-5Ta alloy
Materials and Manufacturing Processes ( IF 4.8 ) Pub Date : 2021-07-05 , DOI: 10.1080/10426914.2021.1948054
S. P. Leo Kumar 1 , D. Avinash 1
Affiliation  

ABSTRACT

β-type Titanium (Ti) alloy possesses less Young’s Modulus (E), which is significant for manufacturing of medical implants, since it reduces stress shielding effect. In this work, surface quality analysis on Ti-35Nb-7Zr-5Ta(TNZT) alloy was carried out to reveal the osseointegration characteristics. TNZT alloy was fabricated by vacuum arc melting followed by homogenization process. Microstructure analysis with X-ray diffraction spectroscopy study revealed the formulation of body-centered cubic structure in the TNZT alloy. Further high speed milling was carried out to analyze the impact of process variables on surface quality. Parameters include axial depth of cut (ap), cutting velocity (vc), and feed/tooth (fz) are taken into consideration. In general, implants are miniature in size; hence, Carbide flat end mill cutter size of 2 mm is used for investigation. 27 slots are generated under mist cooling condition by using factorial experimental design approach. Surface characteristics and morphology of machined region were examined to discover biocompatibility. It is observed that ‘ap’ and ‘vc’ significantly affect surface quality and lowest Ra of 0.422 µm was observed. It is well within the allowable value between 1 and 1.5 µm for better osseointegration. It is also revealed that microparticle deposition and groove formation intensifies when ‘ap’ is higher at 200 µm.



中文翻译:

Ti-35Nb-7Zr-5Ta合金铣削可达到的表面质量研究

摘要

β 型钛 (Ti) 合金具有较低的杨氏模量 (E),这对于制造医疗植入物很重要,因为它降低了应力屏蔽效果。在这项工作中,对 Ti-35Nb-7Zr-5Ta(TNZT) 合金进行了表面质量分析,以揭示其骨结合特性。TNZT合金采用真空电弧熔炼和均质化工艺制成。X 射线衍射光谱研究的微观结构分析揭示了 TNZT 合金中体心立方结构的配方。进一步进行高速铣削以分析工艺变量对表面质量的影响。参数包括切口(一个的轴向深度p),切割速度(v Ç),和进料/齿(F ž) 考虑在内。一般来说,植入物的尺寸是微型的;因此,使用尺寸为 2 mm 的硬质合金平面立铣刀进行研究。采用析因实验设计方法,在雾冷条件下产生27个槽。检查加工区域的表面特征和形态以发现生物相容性。可以观察到,“一个p ”和“V ç ”显著影响表面的质量和最低观察到0.422微米的镭。它完全在 1 到 1.5 µm 之间的允许值内,以实现更好的骨整合。还表明,当“a p ”在 200 µm 处更高时,微粒沉积和凹槽形成会加剧。

更新日期:2021-07-05
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