泡沫钛孔隙结构及力学性能

Pore structure and mechanical properties of titanium foam

摘要:

通过挂浆烧结法制备了两种不同孔隙结构的泡沫钛,利用数码相机和扫描电镜对泡沫钛孔隙结构与形貌观特征进行了观察,通过静态的室温压缩试验,测试了泡沫钛的力学性能与吸能特性。研究发现,应用挂浆烧结法制备的泡沫钛继承了先驱体的结构特征,呈三维立体网状结构,且孔棱是非致密的,存在大量的微孔。泡沫钛是应变速率不敏感的,在应变速率3×10_-4s_-1~1×10_-2s_-1范围内,其屈服强度为1.00MPa~2.38MPa,且泡沫钛具有一定的吸能特性,细孔泡沫钛和粗孔泡沫钛的最大吸能量分别为0.78MJ/m₃和0.22MJ/m₃。

Abstract:

Two kinds of titanium foams with different pore structures were prepared by slurry method. The pore structure and morphology of titanium foam were observed by digital camera and scanning electron microscope. The mechanical properties and energy absorption properties of titanium foam were investigated by the static compression tests. The results show that the titanium foam prepared by slurry method inherits the structure of precursor, and has 3D net structure. The edge of titanium foam is not compact, on which there are many fine pores. Titanium foam is not sensitive to the strain rates, and the yield strength is in the range of 1.00MPa-2.38MPa at strain rate of 3×10_-4s_-1-1×10_-2s_-1.Titanium foam has the properties of absorbing energy, and the titanium foam of fine pore and coarse pore reaches can absorb the max energy of 0.78MJ/m₃ and 0.22MJ/m₃ respectively.