3D打印氮化硅陶瓷点阵结构的性能研究

Study on Properties of Silicon Nitride Ceramics of Lattice Structure Fabricated by 3D Printing

利用DLP技术成功制备出两种氮化硅陶瓷点阵结构:以Gyroid为代表的TPMS结构和以Octettruss为代表的桁架结构。以试样的准静态单轴压缩试验为力学响应,研究并比较了不同结构的几何参数对点阵结构力学性能的影响。结果表明,在单胞尺寸相同的条件下,与Octettruss结构相比,Gyroid结构总体上表现出更加优异的力学性能。当单胞尺寸为4mm×4mm×4mm、壁厚为0.55mm时,Gyroid结构的抗压强度达到了最高的82.8MPa,而Octettruss结构的最大抗压强度仅为24.1MPa。使用有限元软件在相同静力学的条件下对两种陶瓷点阵结构的应力分布进行了分析,为氮化硅陶瓷的轻量化设计与应用奠定了基础。

Two types of silicon nitride ceramic lattice structures were successfully prepared by DLP technology:TPMS structure represented by Gyroid and truss structure represented by Octet truss,respectively.Taking the quasi-static uniaxial compression test of the sample as the mechanical response,the effects of geometric parameters of different structures on the mechanical properties of lattice structures were studied and compared.The results show that the Gyroid structure generally exhibits better mechanical properties than the Octet truss structure under the condition of the same unit cell size.When the unit cell size is 4 mm×4 mm×4 mm and the wall thickness is 0.55 mm,the flexural strength of the Gyroid structure reaches the highest 82.8 MPa,while the maximum flexural strength of the Octet truss structure is only 24.1 MPa.The stress distribution of the two ceramic lattice structures was analyzed under the same static conditions using finite element software,which laid a foundation for the lightweight design and application of silicon nitride ceramics.