Phase formation, microstructure evolution, corrosion behavior and mechanical properties of porous Ti prepared by heat-treating Ag-coated Ti plate

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-04-19 DOI:10.1016/j.matchar.2025.115067

Liuyong Wang , Yue Li , Guanpeng Liu , Min Lei , Xuewen Li , Yulong Li

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引用次数: 0

Abstract

Understanding the mechanism of phase transformation and porous formation is crucial for regulating and controlling the in-situ reaction formation of porous structures. In this work, wet chemical method was combined with vacuum heat treatment technique to form porous structure on the surface of Ti coated with a thin layer of Ag. The temperature dependence of phase formation and pore morphology evolution during the porous formation process was investigated. The results indicate that the mechanical bonding between Ti substrate and Ag coating undergoes Ti-Ag mutual diffusion and Ag sublimation, transitioning from layered Ti₂Ag and TiAg layers to embedded forms, ultimately forming pores as the temperature increases. This is attributed to the residual β-Ti on the upper surface undergoes eutectoid reaction with TiAg to generate Ti₂Ag, exhibiting the morphology of TiAg embedded in the Ti₂Ag layer. And the reverse reaction of peritectic reaction occurs to form L(Ag, Ti). The continuous sublimation of Ag promotes the formation of uniformly distributed micro-pores (5 μm). Furthermore, porous Ti exhibits excellent corrosion resistance performance compared to other porous metals and an elastic modulus (60.2 GPa) similar to that of human bone.

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热处理镀银Ti板制备多孔Ti的相形成、显微组织演化、腐蚀行为和力学性能

了解相变和多孔结构形成的机理对调控原位反应形成多孔结构具有重要意义。本文将湿化学法与真空热处理技术相结合，在Ti表面形成多孔结构，并包覆一层薄银。研究了孔隙形成过程中相形成和孔隙形态演化的温度依赖性。结果表明：随着温度的升高，Ti基体与Ag涂层之间的机械结合经历了Ti-Ag的相互扩散和Ag的升华，从层状Ti2Ag和TiAg层过渡到嵌套形式，最终形成孔洞；这是由于上表面残留的β-Ti与TiAg发生共析反应生成Ti2Ag，表现出TiAg嵌套在Ti2Ag层中的形态。并发生包晶反应的反反应，生成L（Ag, Ti）。Ag的持续升华促进了均匀分布的微孔（5 μm）的形成。此外，与其他多孔金属相比，多孔钛具有优异的耐腐蚀性能，其弹性模量（60.2 GPa）与人骨相似。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.