选区激光熔化制备蜂窝状多孔钛及表征
亢宁宁,陈文革,杨鑫
西安理工大学
Preparation and characterization of honeycomb porous titanium using selective laser melting
摘要 本文把球形粉与异形粉按一定的质量比混合作为原料，采用选区激光熔化技术以不同的构建方向制备出不同孔隙率的蜂窝状多孔纯钛，运用光学显微镜、扫描电镜、X射线衍射仪、万能拉压试验机等手段系统研究多孔钛的形貌和性能，结果表明，当平均粒径75 μm 的球形粉与平均粒径25 μm的异形粉按照8:2的质量比混合后，以121 J/mm3的激光能量制备预设孔隙率为55%的蜂窝状多孔纯钛，实际孔隙率为63.93%, 其晶体结构为α-Ti与α’-Ti，孔形状具有典型的六边形形状，孔大小为900μm，孔壁呈典型的冶金结合，缺陷较少，抗压强度为70 MPa，弹性模量为4.419 GPa。
关键词 ：
选区激光熔化 ,
多孔钛 ,
粉体形状 ,
孔形状
Abstract ：In this paper, spherical powder and irregular-shape powder were mixed according to a certain mass ratio as raw materials, and honeycomb porous pure titanium with different porosity was prepared by laser selective melting technique (SLM). The microstructure and properties of porous titanium were systematically studied by optical microscope, scanning electron microscope, X-ray diffractometer and universal tension and compression tester. The result show that the actual porosity of honeycomb porous titanium is 63.93% using laser energy of 121.2J/mm3, which the spherical powder of 52μm~104μm and the irregular-shape powder of 17μm ~70μm are mixed according to the mass ratio of 8:2 with default porosity of 55%. The crystal structure is α-Ti and α’-Ti phase, the size of the hole is 900μm, and the pore shape is typical hexagonal shape. The compressive strength and elastic modulus of porous pure titanium is 70 MPa and 2.6GPa, respectively. The hole wall shows typical metallurgical bonding and few defects.
Key words ：
Selective laser melting
Porous titanium
Powder shape
Hole shape
收稿日期: 2019-10-18
出版日期: 2020-08-31
基金资助: 石墨烯调控3D打印高强高孔隙率功能钛的研究;增材制造用高品质、低成本钛合金粉末技术开发
通讯作者:
陈文革
E-mail: wgchen001@263.net
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2020, Vol. 27 