基于激光二次烧结单元体成型多孔结构体的研究

Study on laser secondary sintering of porous structure from unit body's connection

多孔结构材料作为功能结构材料被广泛应用。提出一种基于特殊四面体颗粒作为基本单元体进行激光二次烧结成型多孔结构体新工艺。通过实验测得单元体颗粒堆积密度与孔隙率,由PFC3D软件模拟单元体堆积得到模拟孔隙率,其数值与实验结果相近。通过软件获取堆积截面形貌,观测单元体颗粒堆积下内部孔隙的尺寸分布。对单元体表面喷粉后进行激光二次烧结成型发现,随着激光功率增加、扫描速度减小,单元体颗粒粘接性能提高。

The porous structural material is widely used as a functional structural material. A new method of forming the porous structural material is proposed by a secondary laser sintering from special tetrahedron particles. The particle packing density and porosity are tested from experiments and the simulation of the porosity from the simulating software PFC3D is quite similar to the experimental result. Getting thorough the simulating section of the particle packing, the inside unit body pore size distribution is observed. The unit body＇ s surface is sprayed by powders and the second laser sintering is tested. The result is coming out that the unit body＇ s adhesive property is improved with the increase of the laser power and decrease of the laser speed.