Dept. of Materials Science and Metallurgical Engineering, Indian Institute of Technology Hyderabad, Kandi 502285, Telangana, India.
CSIR-Central Electrochemical Research Institute, Karaikudi, Tamil Nadu 630006, India.
Mater Sci Eng C Mater Biol Appl. 2019 Jan 1;94:619-627. doi: 10.1016/j.msec.2018.10.006. Epub 2018 Oct 2.
The main purpose of this work is to obtain homogenous, single β phase in binary Ti-xNb (x = 18.75, 25, and 31.25 at.%) alloys by simple mixing of pure elemental powders using different sintering techniques such as spark plasma sintering (pressure-assisted sintering) and conventional powder metallurgy (pressure-less sintering). Synthesis parameters such as sintering temperature and holding time etc. are optimized in both techniques in order to get homogenous microstructure. In spark plasma sintering (SPS), complete homogeneous β phase is achieved in Ti25at.%Nb using 1300 °C sintering temperature with 60 min holding time under 50 MPa pressure. On the other hand, complete β phase is obtained in Ti25at.%Nb through conventional powder metallurgy (P/M) route using sintering temperature of 1400 °C for 120 min holding time which are adopted from the dilatometry studies. Nano-indentation is carried out for mechanical properties such as Young's modulus and nano-hardness. Elastic properties of binary Ti-xNb compositions are fallen within the range of 80-90 GPa. Cytotoxicity as well as cell adhesion studies carried out using MG63, osteoblast-like cells showed excellent biocompatibility of thus developed Ti25at.%Nb surface irrespective of fabrication route.
这项工作的主要目的是通过使用不同的烧结技术（如火花等离子体烧结（压力辅助烧结）和传统粉末冶金（无压烧结））简单地混合纯元素粉末，在二元 Ti-xNb（x=18.75、25 和 31.25 原子%）合金中获得均匀、单一的β 相。在这两种技术中，优化了诸如烧结温度和保温时间等合成参数，以获得均匀的微观结构。在火花等离子体烧结（SPS）中，使用 1300°C 的烧结温度和 50MPa 下 60 分钟的保温时间，在 Ti25at.%Nb 中完全实现了均匀的β 相。另一方面，通过采用热膨胀法研究得出的 1400°C 烧结温度和 120 分钟保温时间，在 Ti25at.%Nb 中通过传统粉末冶金（P/M）路线获得了完全的β 相。进行了纳米压痕测试以研究杨氏模量和纳米硬度等力学性能。二元 Ti-xNb 成分的弹性性能在 80-90GPa 范围内。使用 MG63、成骨细胞样细胞进行的细胞毒性和细胞粘附研究表明，无论采用哪种制造路线，所开发的 Ti25at.%Nb 表面均具有优异的生物相容性。
