Structure design and process parameter optimization of active mixing nozzle based on PDMS/SiC functional gradient composite

doi:10.19491/j.issn.1001-9278.2023.02.011

Abstract

Abstract:

Taking the mixture of high⁃viscose polydimethylsiloxane （PDMS） and silicon carbide （SiC） powders as an example， the active mixing nozzle was designed and optimized through hydrodynamic simulation. The influence of different screw structures on the mixing effect of active mixing nozzle was analyzed through simulation. The bidirectional quad⁃screw structure was selected to explore the effect of structural parameters such as screw length， screw and cavity clearance on the mixing effect. The screw length and the gap between screw and cavity were determined to be 12 and 0.2 mm， respectively. The rotation speed and inlet speed of the structure were optimized， and the rotation speed and inlet speed were determined to be 60 r/min and as 1 mm/s， respectively. In addition， the structure can be mixed effectively under different material volume ratio based on the analysis results. Through printing samples， it was confirmed that the effective mixing of composite materials could be realized by using the active mixing nozzle.

Key words: active mixing nozzle, screw structure, functionally gradient composite, structural design, parameter optimization

CLC Number:

TQ320.5

LI Chuanmin, YANG Jianjun, LI Yang, WANG Luowei. Structure design and process parameter optimization of active mixing nozzle based on PDMS/SiC functional gradient composite[J]. China Plastics, 2023, 37(2): 71-76.

Figures/Tables 11

Fig.1. Active mixing nozzle device

材料	密度/kg·m^-3	黏度/cp
100 %PDMS	1 040.0	3 500
50 %PDMS+50 %SiC	1 680.5	32 300

Tab.1. Parameters of the materials

Fig.2. Screw structures and meshs

Fig.3. Mixed cloud images of longitudinal and transverse section interfacial density of various types of the screws

Fig.4. Mixed cloud images for interfacial density of screws with different lengths

Fig.5. Mixed cloud image of interfacial density at different spacings

Fig.6. Mixed cloud images of interfacial density at different speeds

Fig.7. Mixed cloud images of interfacial density at different inlet velocities

Fig.8. Mixed cloud image of interfacial density under different material ratio and standard chromatograms

Fig.9. Physical photograph of screw structure

Fig.10. Print samples and their microscopic morphology

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