利用选择性激光烧结成型技术所制备的石墨件内部疏松多孔、抗弯强度和导电性能不佳, 难以直接作为功能结构件使用。对比研究了两种后处理工艺对SLS石墨件的综合性能影响。研究表明, 采取真空压力浸渍酚醛树脂溶液对SLS石墨件的性能改善有限, 经三次真空压力浸渍、碳化和高温烧结后, 试样密度可达到1.24 g/cm3, 相应地抗弯强度和电导率为27.11 MPa和253.80 S/cm, 进一步提高难度较大; 而采取热压固化工艺比较容易增密, 在3.00 MPa压力作用下, 试样密度可以达到1.59 g/cm3, 经碳化、高温烧结后, 其抗弯强度和电导率分别达到33.88 MPa和380.98 S/cm。最后通过对多孔石墨骨架和石墨模具进行了后处理, 验证了上述工艺的可行性。

Graphite parts prepared by selective laser sintering technology have poor porosity, bending strength and poor electrical conductivity, and are difficult to directly use as functional structural parts. In this paper, the effects of two post-treatment processes on the overall performance of SLS graphite parts are compared. Studies have shown that the vacuum pressure impregnation of phenolic resin solution has limited performance improvement on SLS graphite parts. After three vacuum pressure impregnation, carbonization and high temperature sintering, the sample density can reach 1.24 g/cm3, correspondingly the flexural strength and conductivity reached 27.11 MPa and 253.80 S/cm, further difficulty is more difficult; and the hot pressing curing process is relatively easy to densify. Under the pressure of 3.00 MPa, the sample density can reach 1.59 g/cm3, after carbonization and high temperature sintering. Its flexural strength and electrical conductivity reach 33.88 MPa and 380.98 S/cm. Finally, the feasibility of the above process was verified by post-processing the porous graphite skeleton and graphite mold.