High-performance cyanate ester composites with plasma-synthesized MgSiO3-SiO2-hBN powders for thermally conductive and dielectric properties
Source abstract
Abstract
Abstract Thermally conductive composites aimed for dielectric application were achieved by embedding spherical MgSiO3-SiO2-hBN powders into cyanate ester resin as functional fillers. The MgSiO3-SiO2-hBN particles were prepared by plasma sythesized process employing talc and hexagonal boron nitride (hBN) as sources. The morphology, phase structure of the MgSiO3-SiO2-hBN powders were characterized by changing the content of BN. Meanwhile, the thermal and dielectric properties of the composites with different filler loading were investigated. Results show that phase transformation from talc to protoenstatite and critobalite occurred. The thermal conductivity shows a drastic enhancement with the increase of the filler loading. Further contrast analyzed by Bruggeman model shows that the tested values agree well with estimated ones when fillers fraction are less than 15 vol%. However, an obvious deviation for the values of thermal conductivities is thought to arise from the randomly oriented hBN and the formation of the thermal conductive networks in composites. Relatively low dielectric constants and dielectric losses (tanδ) are obtained for all the composites.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Thermal properties of materials · Advanced ceramic materials synthesis · Dielectric materials and actuators
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