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为获得具备良好力学性能和生物相容性的多孔植入体,需对激光选区熔化(SLM)成型Co Cr Mo多孔结构进行性能分析。在电子万能试验机上沿零件加工的纵向进行压缩试验,应用分形插值理论分析相关参数对其压缩性能的影响。试验结果表明:变形主要以滑移为主;弹性模量和抗压强度随着孔隙率和平均孔径的增大而减小,随表面积体积比的增大而增大。正八面体和正六面体多孔结构孔隙率为55%~84%,平均孔径为0.51~0.99 mm,表面积体积比为2~4.2时,弹性模量都能满足要求。正八面体圆柱形多孔结构的性能比方形结构更加优越,正六面体方形结构的性能比圆柱形结构更好,为激光选区熔化成型多孔Co Cr Mo合金结构医学植入体的研制提供重要依据。
In order to obtain porous implants with good mechanical properties and biocompatibility, the properties of the Co Cr Mo porous structure molded by laser selective melting (SLM) are analyzed. In the electronic universal testing machine along the part of the longitudinal compression test, the application of fractal interpolation theory analysis of the relevant parameters on the compression performance. The experimental results show that the deformation is mainly slip; the elastic modulus and compressive strength decrease with the increase of porosity and average pore size, and increase with the increase of volume ratio of surface area. The porosity of regular octahedron and regular hexahedron porous structure is 55% ~ 84%, the average pore diameter is 0.51 ~ 0.99 mm and the surface area to volume ratio is 2 ~ 4.2, the elastic modulus can meet the requirements. The regular octahedron cylindrical porous structure is more superior to the square structure. The regular hexahedral square structure is better than the cylindrical structure, which provides an important basis for the development of the laser selective fusion porous Co Cr Mo alloy medical implants.