Effect of laser power on mechanical properties of SiC composites rapidly fabricated by selective laser sintering and direct liquid silicon infiltration
Effect of laser power on mechanical properties of SiC composites rapidly fabricated by selective laser sintering and direct liquid silicon infiltration
复制标题
激光功率对选择性激光烧结和直接液态硅渗透快速制备SiC复合材料机械性能的影响
DOI：
10.1016/j.ceramint.2022.03.203
复制
发表时间：
2022-05-26
影响因子：
5.2
通讯作者：
Huang, Zhengren
中科院分区：
文献类型：
--
作者：
Chen, Xiao;Yin, Jie;Huang, Zhengren
选择性激光烧结(SLS)是高效制备复杂结构碳化硅复合材料的一种很有前途的添加剂制造技术。本文提出了一种碳纤维激光烧结结合液态硅渗透制备碳化硅复合材料的新方法。采用SLS法制备了由短切碳纤维(C-f)和酚醛树脂(PR)混合粉末组成的SLS粉末，得到了具有可剪裁微观结构的C-f/PR生坯。印制的坯体PR含量低(25vol%)，印刷稳定性高，强度优异。最后，采用液态硅浸渍法制备了高性能的碳化硅复合材料，其最佳密度、弯曲强度、弹性模数和断裂韧性分别为2.719+/-0.008 g/cm(3)、2 66+/-5 Mpa、2 48+/-3 Gpa和2.87+/-0.0 7Mpa m(1/2)。这一策略展示了一种制备具有可设计复杂结构的近净形状高性能碳化硅复合材料的有效方法。
Selective laser sintering (SLS) is a promising additive manufacturing technique for the efficient fabrication of SiC composites with complex structures. In this work, a novel strategy for fabricating SiC composites via SLS of carbon fiber combined with liquid silicon infiltration is reported. The SLS-powder composed of chopped carbon fiber (C-f) and phenolic resin (PR) mixed powder, a C-f/PR green body with a tailored microstructure was obtained by SLS. The printed green body had a low PR content (25 vol%), high printing stability, and excellent strength. Finally, high-performance SiC composites are prepared via the liquid silicon infiltration, with optimized density, flexural strength, elastic modulus, and fracture toughness values of 2.719 +/- 0.008 g/cm(3), 266 +/- 5 MPa, 248 +/- 3 GPa, and 2.87 +/- 0.07 MPa m(1/2), respectively. This strategy demonstrates an efficient approach to produce near net-shape high-performance SiC composites with a designable complex structure.