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Surface modification of carbon fibers and the selective laser sintering of modified carbon fiberylon 12 composite powder

机译：碳纤维的表面改性及改性碳纤维/尼龙12复合粉的选择性激光烧结

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This work aims to study the surface modification and reinforcing effect in carbon fiber (CF)ylon 12 (PA12) composites of CFs, and more importantly, resolves the practical application problems of modified CF/PA12 composite powder in selective laser sintering (SLS). CFs were surface modified by nitric acid (HNO3), the surface changes of CFs were characterized by SEMI FT-IR and XPS. Initially, the effects of the experimental factors on the properties of composites were investigated, and the CF/PA12 composite powder prepared with optimized technological parameters was subsequently adopted in SLS experiments. The sintering behavior and relationship between mechanical properties and porosity of sintered specimens were also discussed. The results indicated that the oxygen functional groups on HNO3 modified CFs were partly thermally decomposed and released as gas in the process of laser sintering, which caused high porosity and poor mechanical properties of sintered specimens. Treating CFs at 400 degrees C (approximately the laser sintering temperature) after HNO3 modification was proposed as a solution. This treatment preserved part of the modified effect and reduced the porosity of the composites at the same time. Compared with the unmodified CF/PA12 sintered specimens, the tensile strength, tensile modulus, flexural strength, and flexural modulus were all increased to different degrees. (C) 2016 Elsevier Ltd. All rights reserved.
机译：这项工作旨在研究CFs的碳纤维（CF）/尼龙12（PA12）复合材料的表面改性和增强效果，更重要的是，解决改性CF / PA12复合粉末在选择性激光烧结（SLS）中的实际应用问题。 。 CFs被硝酸（HNO3）表面改性，CFs的表面变化通过SEMI FT-IR和XPS表征。最初，研究了实验因素对复合材料性能的影响，随后在SLS实验中采用了具有优化工艺参数的CF / PA12复合粉末。还讨论了烧结行为及其与力学性能和孔隙率之间的关系。结果表明，HNO3改性CFs上的氧官能团在激光烧结过程中被部分热分解并作为气体释放，这导致了烧结后样品的高孔隙率和较差的机械性能。提出了在HNO 3改性后在400℃（大约激光烧结温度）下处理CFs的解决方案。这种处理保留了部分改良效果，同时降低了复合材料的孔隙率。与未改性的CF / PA12烧结试样相比，抗张强度，拉伸模量，弯曲强度和弯曲模量均不同程度地增加。 （C）2016 Elsevier Ltd.保留所有权利。

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