炭纤维/尼龙12复合粉体的制备及选择性激光烧结行为  

Preparation and selective laser sintering behavior of carbon fiber/polyamide 12 composite

作　　者：吴琼[1] 陈惠[1] 巫静[1] 夏笑虹[1] 许小曙 边宏 刘洪波[1] 

机构地区：[1]湖南大学材料科学与工程学院,长沙410082 [2]湖南华曙高科技有限公司,长沙410205

出　　处：《功能材料》2016年第4期174-177,共4页Journal of Functional Materials

基　　金：湖南省科技重大专项资助项目(2013FJ1001-2);高校青年教师成长基金资助项目(531107040186)

摘　　要：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 sintering 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 composite 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 reinforced polyamide 12 sintered components,the tensile strength,tensile modulus,flexural strength,flexural modulus are incresed at different degrees.

关 键 词：炭纤维 尼龙12 液相氧化 选择性激光烧结 力学性能 

分 类 号：TB321[一般工业技术—材料科学与工程]