Study on modification and design of thermal conductive and microwave absorbing dual⁃functional powders

doi:10.19491/j.issn.1001-9278.2024.06.003

Abstract

Abstract:

A type of thermal conductive and microwave absorbing dual⁃functional powders were designed with different ratios and particle sizes using aluminum oxide （Al₂O₃） as thermal conductivity powders， sendust （FeSiAl） as microwave absorbing powders， and dodecyltriethoxysilane （C12） as a modifier. The resultant dual⁃functional powders were filled in a silicone oil to prepare a thermal conductive and microwave absorbing pad， thus developing a series of thermal conductivity absorbing dual⁃function integrated materials. The results indicated that C12 generated a good lipophilic modification effect on Al₂O₃ and FeSiAl. The thermal conductive and microwave absorbing pad showed a thermal conductivity of 5.92 W/（m·K） at a Al₂O₃/FeSiAl mass ratio of 20∶80， exhibiting a good absorbing capability in the frequency range of 4.8~6.5 GHz. Ensuring a high thermal conductivity， the as⁃prepared powders were endowed with a wave⁃absorbing capability. Meanwhile， it is easy for the powders to be compressed and convenient for practical assembly applications， and their 50⁃psi compression stress reached a compression strain of 50 %.

Key words: thermal conductivity, microwave absorbing, modification, compression

CLC Number:

TQ324.8

GAO Wei, XIONG Changyi, HAN Fei, KONG Nizao, YAN Yuanwei. Study on modification and design of thermal conductive and microwave absorbing dual⁃functional powders[J]. China Plastics, 2024, 38(6): 19-24.

Figures/Tables 11

Fig.1. IR of unmodified and modified powder

Fig.2. Appearance and mixing effection with silicone oil of unmodified and modified powder

试样序号	导热吸波粉体质量比Al₂O₃∶FeSiAl	Al₂O₃粒径配比	FeSiAl粒径配比
试样序号	导热吸波粉体质量比Al₂O₃∶FeSiAl	w（75 μm）∶w（5 μm）∶w（0.8 μm）	w（50 μm）∶w（26 μm）
S1	32∶68	1∶0∶0	1∶0
S2		0∶0∶1	1∶0
S3		3∶2∶1	1∶0
S4		1∶2∶3	1∶0
S5		1∶2∶4	1∶0
S6		1∶2∶5	1∶0
S7	20∶80	1∶2∶3	1∶0
S8		1∶2∶3	1∶1
S9		1∶2∶3	1∶3

Tab.1. Test formula

Fig.3. The thermal conductivity test results of S1~S9 samples

Fig.4. Powder size distribution curves and SEM of S1、S2、S3、S4 and S9

Fig.5. SEM of S1、S2、S3、S4 and S9

Fig 6. Design principle diagram of the thermally conductive and microwave absorbing powders

Fig.7. TG curves of S1、S2、S3、S4 and S9

Fig.8. The electromagnetic parameter diagrams of S9

Fig.9. The reflection loss diagrams of S9

Fig.10. The compressive stress⁃strain curve of S9

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