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High thermal conductive epoxy molding compound with thermal conductive pathway
Author(s) -
Zeng Jun,
Fu Renli,
Shen Yuan,
He Hong,
Song Xiufeng
Publication year - 2009
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.30045
Subject(s) - materials science , composite material , thermal conductivity , epoxy , volume fraction , electrical conductor , molding (decorative) , thermal expansion , dielectric , optoelectronics
The epoxy molding compound (EMC) with thermal conductive pathways was developed by structure designing. Three kinds of EMCs with different thermal conductivities were used in this investigation, specifically epoxy filled with Si 3 N 4 , filled with hybrid Si 3 N 4 /SiO 2 , and filled with SiO 2 . Improved thermal conductivity was achieved by constructing thermal conductive pathways using high thermal conductivity EMC (Si 3 N 4 ) in low thermal conductivity EMC (SiO 2 ). The morphology and microstructure of the top of EMC indicate that continuous network is formed by the filler which anticipates heat conductivity. The highest thermal conductivity of the EMC was 2.5 W/m K, reached when the volume fraction of EMC (Si 3 N 4 ) is 80% (to compare with hybrid Si 3 N 4 /SiO 2 filled‐EMC, the content of total fillers in the EMC was kept at 60 vol %). For a given volume fraction of EMC (Si 3 N 4 ) in the EMC system, thermal conductivity values increase according to the order EMC (Si 3 N 4 ) particles filled‐EMC, hybrid Si 3 N 4 /SiO 2 filled‐EMC, and EMC(SiO 2 ) particles filled‐EMC. The coefficient of thermal expansion (CTE) decreases with increasing Si 3 N 4 content in the whole filler. The values of CTE ranged between 23 × 10 −6 and 30 × 10 −6 K −1 . The investigated EMC samples have a flexural strength of about 36–39 MPa. The dielectric constant increases with Si 3 N 4 content but generally remains at a low level (<6, at 1 MHz). The average electrical volume resistivity of the EMC samples are higher than 1.4 × 10 10 Ω m, the average electrical surface resistivity of the EMC samples are higher than 6.7 × 10 14 Ω. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009