3D printing formation law of PDMS/SiC functionally graded materials based on top heating and step⁃by⁃step forming

doi:10.19491/j.issn.1001-9278.2023.11.008

Abstract

Abstract:

Polydimethylsiloxane （PDMS）⁃based material has a feature of spreading （flow infiltration） in the uncured state， and the traditional bottom heating curing method can not meet the requirement of timely curing. To solve this problem， a PDMS/silicon carbide （SiC） powder⁃mixed functional gradient material was taken as an example， and a two⁃step 3D printing precision forming method for border area and filling area was proposed by using a dual heating method on the top and bottom plate. The effects of the printing speed， air pressure， effect of laser power density， and other process parameters on the manufacturing accuracy of PDMS/SiC composites with different SiC contents were investigated. Finally， a laser power density of 101.85 W/cm² was selected for the printing of the functional gradient sample. The results indicated that the overall morphology of the samples prepared by the multi⁃step printing method was excellent， and their side angle increased from 40° to 80°. This greatly improved the precision of the printed shapes and dimensions.

Key words: step?by?step 3D printing, top heating, functionally graded material

CLC Number:

TQ320.66

WANG Luowei, YANG Jianjun, ZHU Jialei. 3D printing formation law of PDMS/SiC functionally graded materials based on top heating and step⁃by⁃step forming[J]. China Plastics, 2023, 37(11): 74-80.

Figures/Tables 12

Fig.1. Influence of not curing in time on the forming of printed parts

Fig.2. Schematic diagram of step⁃by⁃step forming and printing process of PDMS/SiC functional gradient flexible substrate structure

Fig.3. Multi⁃head 3D printer based on ink direct writing technology

Fig.4. Printout nozzle and its section diagram

Fig.5. Effect of printing speed and air pressure on thickness of the base layer

Fig.6. Effect of focusing distance on spot focusing diameter and laser power density

Fig.7. Print line width and layer thickness before and after applying top heating

Fig.8. Effect of laser power density on thickness and line width of the printing layer in frame area

Fig.9. Effect of printing speed and air pressure on thickness and line width of printing layer in border area with different SiC contents

Fig.10. Effect of printing parameters on thickness of the printing layer in filling area

打印层	区域	SiC 含量/%	激光功率密度/W·cm^-2	打印速度/mm·s^-1	气压/MPa
基底层	边框区	0	—	20	0.05
基底层	填充区	0	—	20	0.05
第一层	边框区	15	101.85	5	0.04
第一层	填充区	15	—	10	0.04
第二层	边框区	30	101.85	8	0.06
第二层	填充区	30	—	12	0.05
第三层	边框区	45	101.85	5	0.06
第三层	填充区	45	—	10	0.06

Tab.1. Process parameters for printing

Fig.11. Comparison of morphology of PDMS/SiC functional gradient samples printed by different methods

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