THz Spectroscopy Characterization Of ABS Material Morphology And Defect

3D printing technology is the emerging materials processing technology,widely quoted in the aerospace,industrial,medical,education,creative design,and other fields.ABS material is a kind of engineering plastics which widely used in the automotive industry,electronic appliances,textile,appliances and building materials areas,and it is also the most common type of 3D printing materials.As 3D printing technology into civil consumption field,the rapid growth of demand for 3D printing consumables.Due to the limitations of existing technology,some defects occurs in the use of ABS realize 3D printing,the defects had an impact in the quality of printing parts and beauty performance,so we need new technology to detect defects of 3D printing products.The terahertz radiation(1THz=1012Hz)refers to electromagnetic wave radiation in 0.1-10 THz,THz wavelength is 0.03mm-3mm,THz wave have low energy(4.1Mev),high SNR(signal to noise ratio),and high resolution,which widely applied in material nondestructive filed.This article in view of the present 3D printing consumables huge market prospects,in the process of the combination with 3D printers use ABS material in some situation,based on the THz time domain spectroscopy with different shapes and different internal filling defect of spectral properties of ABS material was studied,the main work and research conclusion summed up as follows:(1)Participated in terahertz equipment installation and debugging work,and have deep understanding of terahertz principle and terahertz equipment;(2)Designed three different shape models,and studied the optical characteristics of 3 kinds of different shape of 3d printing ABS materials by transmission THz-TDS system.The results show that the peak time of terahertz wave through irregular shape object is proportional to thickness,corresponding amplitude changes to satisfy certain regularity,at the same time,the shape of irregular also prompted a multimodal THz wave through the situation.(3)Studied the optical characteristics of 8 kinds infill ABS material by transmission THz-TDS system.The results showed that the peak time of THz wave through 3D printing is directly proportional to the thickness of the ABS material,different internal infill percentage have greatly influence in the peak time of THz wave.In addition,the refractive index difference of different internal infill percentage of 3D printing ABS material is different.We can compare and distinguish different internal infill percentage 3D printing ABS material with different refractive index,and with the increase of the thickness,the average refractive index change with the internal infill percentage presents positive correlation relationship.As for absorption coefficient,in a certain thickness range,the absorption of different internal infill percentage 3D printing ABS materials are same,beyond the certain range thickness,the corresponding absorption coefficient decreases with the increase of thickness.Finally,some suggestions are put forward for the further study of THz spectroscopy applied to 3D printing industry.