Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 118, Issue -, Pages 67-74Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2018.12.019
Keywords
Polymer-matrix composites; Thermal properties; Mechanical properties; Rheology
Funding
- National Natural Science Foundation of China [51473047, 51803052, 51210004]
- National Natural Key Research and Development Program of China [2016YFB0302405]
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In this study, epoxy (EP)/binary spherical alumina (S-Al2O3) composites with a high loading of 50 vol% were fabricated by incorporating different sizes of S-Al2O3 into EP to increase the thermal conductivity and yet retain the flowability of the composites. Notably, a distinctly reduced viscosity (21.8 Pa.s) and a highly increased thermal conductivity (1.364 W/m.K) were achieved by a binary S-Al2O3 mixture with 80% 30 mu m and 20% 5 mu m alumina that would have a theoretical maximum packing volume, thus permitting larger available free volume for the motion of particles and hence reducing the friction between them. Also, these EP/S-Al2O3 binary composites possessed superior electrical insulation, high thermal stability, significantly reduced thermal expansion coefficient and good mechanical properties. These combined desirable properties indicate that binary S-Al2O3 mixtures with an optimized size distribution and maximum packing volume are best candidates to develop high-performance epoxy-based underfill materials which would improve the flip-chip reliability.
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