Mechanical and microwave absorbing properties of Mn-Zn ferrite/polylactic acid composites formed by fused deposition modeling
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摘要: 3D打印技术在快速制造复杂形状零件方面获得了越来越多的关注。将锰锌铁氧体(MZF)作为增强体填充到聚乳酸(PLA)中,通过球磨混合和熔融挤出法制备出MZF/PLA复合线材,利用熔融沉积成形(FDM)制备出MZF/PLA复合材料。采用XRD、 SEM和矢量网络分析仪对不同复合比例的MZF/PLA复合材料的微观形貌、力学性能和电磁性能进行表征,并计算不同厚度的反射损耗,研究MZF的含量对复合材料吸波性能的影响。结果表明:当MZF含量为10wt%时,MZF/PLA复合材料的拉伸强度相比纯PLA提升了17.6%,随着MZF含量的提升,复合材料的吸波性能随之增强。当MZF的含量达到50wt%,在12.7 GHz处,厚度为7.4 mm时反射率达到最小值−55.3 dB,在厚度为7.9 mm时,有效吸波频带宽为4.5 GHz。因此,基于FDM制备的3D打印MZF/PLA复合材料具有良好的吸波性能和承载能力,是一种非常有前途的3D打印微波吸收材料。
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关键词:
- 复合材料 /
- 锰锌铁氧体 /
- 吸波性能 /
- 力学性能 /
- 熔融沉积成形(FDM)
Abstract: 3D printing technology has received more and more attention in the rapid manufacturing of complex shape parts. Mn-Zn ferrite (MZF) was filled into polylactic acid (PLA) as reinforcement, the MZF/PLA composite wire was prepared by ball milling mixing and melt extrusion, and the MZF/PLA composites was prepared by fused deposition modeling (FDM). The micro morphology, mechanical properties and electromagnetic properties of MZF/PLA composites with different composite ratios were characterized by XRD, SEM and vector network analyzer, and the reflection loss of different thickness was calculated to study the effect of MZF content on the microwave absorption properties of the composites. The results show that when the MZF content is 10wt%, the tensile strength of MZF/PLA composite is 17.6% higher than that of pure PLA. With the increase of MZF content, the microwave absorption performance of the composite enhanced. When the content of MZF reaches 50wt% at 12.7 GHz, when the thickness is 7.4 mm, the reflectivity reaches the minimum value of −55.3 dB, and when the thickness is 7.9 mm, the effective microwave absorption band width is 4.5 GHz. Therefore, the 3D printed MZF/PLA composite prepared based on FDM has good microwave absorbing properties and bearing capacity, and it is a very promising microwave absorbing material for 3D printing. -
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图 9 不同MZF含量同轴环的电磁参数:在2~18 GHz频率范围内复介电常数的实部(a)和虚部(b);复磁导率的实部(c)和虚部(d);介电损耗角正切(e)和磁损耗角正切(f)
Figure 9. Electromagnetic parameters of coaxial rings with different MZF contents: Real (a) and imaginary (b) part of the complex permittivity; Real (c) and imaginary (d) part of the complex permeability; Tangent dielectric loss (e) and tangent magnetic loss (f) in the frequency range of 2-18 GHz
11 10%MZF/PLA (a)、20%MZF/PLA (b)、30%MZF/PLA (c)、40%MZF/PLA (d)和50%MZF/PLA (e)的反射损耗三维图和吸波曲线
RLmin—Minimum reflection loss; EAB—Effective absorption bandwidth
11. 3D maps of reflection loss and microwave absorption curves of 10%MZF/PLA (a), 20%MZF/PLA (b), 30%MZF/PLA (c), 40%MZF/PLA (d) and 50%MZF/PLA (e)
表 1 MZF/聚乳酸(PLA)复合材料的组分
Table 1 Component of MZF/polylactic acid (PLA) composites
Sample number Mass fraction/wt% PLA MZF Pure PLA 100 0 10%MZF/PLA 90 10 20%MZF/PLA 80 20 30%MZF/PLA 70 30 40%MZF/PLA 60 40 50%MZF/PLA 50 50 表 2 MZF/PLA复合粉末DSC曲线对应的数据
Table 2 DSC data of MZF/PLA composite powders
Sample number Tm/℃ Tc/℃ Tg/℃ Pure PLA 114.07 97.71 80.81 10%MZF/PLA 110.85 97.71 81.17 20%MZF/PLA 112.17 97.98 81.89 30%MZF/PLA 110.86 97.88 81.62 40%MZF/PLA 111.12 97.71 81.35 50%MZF/PLA 111.11 98.52 81.89 Notes: Tm—Melting temperature; Tc—Crystallization temperature; Tg—Glass transition temperature. 表 3 不同MZF含量的MZF/PLA复合材料的拉伸强度和断裂延伸率
Table 3 Tensile strength and elongation at break of MZF/PLA composites with different MZF contents
Sample
numberTensile strength/MPa Elongation at break/% Pure PLA 34.40 26.12 10%MZF/PLA 40.40 21.76 20%MZF/PLA 35.60 20.56 30%MZF/PLA 25.42 15.28 40%MZF/PLA 16.07 8.93 50%MZF/PLA 14.22 6.68 -
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