采用液相氧化法对PAN基短切炭纤维进行表面改性，再与尼龙12混合，采用选择性激光烧结成形技术制备炭纤维/尼龙12复合粉体试样。利用扫描电子显微镜(SEM)、傅里叶变换红外光谱(FT-IR)表征炭纤维改性前后的表面状态、复合粉体的分散状况及烧结试样的断口形貌。探讨了复合粉体的烧结行为及烧结试样的力学性能与孔隙率的关系。结果表明，改性炭纤维表面的含氧基团在激光烧结时热分解产生气体，导致烧结试样孔隙率较高、力学性能较差。改性炭纤维经高温热处理可以在保留炭纤维表面粗糙度的同时有效降低烧结试样的孔隙率，与未改性炭纤维/尼龙12试样相比，拉伸强度、拉伸模量、弯曲强度和弯曲模量均有不同程度的提高。
The PAN-based chopped carbon fibers were surface modified by liquid-phase oxidation,mixed with polyamide 12,and the carbon fiber reinforced polyamide 12 composites were prepared by selective laser sinte-ring technology.Scanning electron microscope and Fourier transform infrared spectrum were applied to the characterization of the surface state on the carbon fibers before and after modification,the dispersity of compos-ite powder,and fracture morphology of the sintered components.The sintering behavior of composite powder, the relationship between mechanical property and porosity of the sintered components were also discussed.The results show that the oxygen-containing groups on the surface of modified carbon fibers are thermal decomposed and release gas in the process of laser sintering,which cause a high porosity and poor mechanical properties of the sintered components.While the carbon fibers treated under high temperature after modification can preserve the surface roughness,lower the porosity at the same time,and compared with the unmodified carbon fiber re-inforced polyamide 1 2 sintered components,the tensile strength,tensile modulus,flexural strength,flexural modulus are incresed at different degrees.
参考文献
| [1] | Chunze Yan;Liang Hao;Lin Xu;Yusheng Shi.Preparation, characterisation and processing of carbon fibre/polyamide-12 composites for selective laser sintering[J].Composites science and technology,201116(16):1834-1841. |
| [2] | Goodridge, R.D.;Shofner, M.L.;Hague, R.J.M.;McClelland, M.;Schlea, M.R.;Johnson, R.B.;Tuck, C.J..Processing of a Polyamide-12/carbon nanofibre composite by laser sintering[J].Polymer Testing,20111(1):94-100. |
| [3] | Yan Chunze;Shi Yusheng;Yang Jinsong.A Nanosilica/Nylon-12 Composite Powder for Selective Laser Sintering[J].Journal of Reinforced Plastics and Composites,200923(23):2889-2902. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%