Study on properties and manufacturing precision of PDMS/SiC functionally gradient composites

doi:10.19491/j.issn.1001-9278.2022.07.005

Abstract

Abstract:

In this paper， a type of functionally gradient flexible substrates based on polydimethylsiloxane （PDMS）/SiC composites was proposed， and the corresponding 3D printing manufacturing method and process flow were presented. The effects of SiC particle size and content on the mechanical properties and thermal conductivity of the PDMS/SiC substrates were investigated. Moreover， the effects and laws of process parameters such as backpressure， printing speed， line spacing， and temperature on the manufacturing accuracy of the PDMS/SiC substrates were studied. The results indicated that compared to the pure PDMS substrate， the performance of the PDMS/SiC substrates was improved in the presence of SiC. The PDMS/SiC substrates exhibited an increase in elastic modulus by 2.76 times and in thermal conductivity by 2.22 times when the particle size and content of SiC were 600 nm and 45 wt%， respectively.

Key words: polydimethylsiloxane, silicon carbide, composite, functional gradient, flexible substrate

CLC Number:

TQ320.66

SONG Yinbao, YANG Jianjun, LI Chuanmin. Study on properties and manufacturing precision of PDMS/SiC functionally gradient composites[J]. China Plastics, 2022, 36(7): 30-36.

Figures/Tables 13

平均粒径	比表面积/m²·g^-1	体积密度/g·cm^-3	颜色
600 nm	20	0.15	灰色
30 μm	5.6	0.8	绿色
60 μm	5.3	0.8	绿色

Tab.1. Enhanced phase SiC parameters

Fig.1. Functionally gradient substrate structure of PDMS/SiC composites

Fig.2. Multi?nozzle 3D printer equipment based on ink direct writing technology

Fig.3. Manufacturing process flow

Fig.4. Effects of different SiC particle sizes and content on mechanical properties of PDMS/SiC composites

Fig.5. Effects of different SiC particle sizes and content on thermal conductivity of PDMS/SiC composites

Fig.6. Effect of printing speed on printing thickness

Fig.7. Effect of back pressure on printing thickness

Fig.8. Effect of line spacing on printing thickness

Fig.9. Effect of heating temperature on surface roughness of the substrate

Fig.10. Effect of heating temperature on substrate printing size

SiC含量/%	打印速度/ mm·s^-1	加热温度/℃	背压/kPa	线间距/mm
0	20	80	60	0.6
15	15	80	60	0.6
30	10	80	60	0.6
45	5	80	60	0.6

Tab.2. Printing parameters of each gradient layer

Fig.11. Tensile testing of PDMS/SiC functionally gradient flexible substrates

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