【摘 要】
：
Hetero-structured thermally conductive spherical boron nitride and boron nitride nanosheets(BNN-30@BNNS)fillers were prepared via electrostatic self-assembly method.And the corresponding thermally conductive&electrically insulating BNN-30@BNNS/Si-GFs/E-44
【机 构】
：
Research & Development Institute of Northwestern Polytechnical University in Shenzhen,Shenzhen,51805
论文部分内容阅读
Hetero-structured thermally conductive spherical boron nitride and boron nitride nanosheets(BNN-30@BNNS)fillers were prepared via electrostatic self-assembly method.And the corresponding thermally conductive&electrically insulating BNN-30@BNNS/Si-GFs/E-44 laminated composites were then fabri-cated via hot compression.BNN-30@BNNS-Ⅲ(fBNN-30/fBNNS,1/2,wt/wt)fillers presented the optimal synergistic improvement effects on the thermal conductivities of epoxy composites.When the mass fraction of BNN-30@BNNS-Ⅲ was 15 wt％,λ value of the BNN-30@BNNS-Ⅲ/E-44 composites was up to 0.61 Wm-1K-1,increased by 2.8 times compared with pure E-44(λ=0.22Wm-1K-1),also higher than that of the 15 wt％BNN-30/E-44(0.56Wm-1K-1),15wt％BNNS/E-44(0.42 Wm-1K-1),and 15 wt％(BNN-30/BNNS)/E-44(direct blending BNN-30/BNNS hybrid fillers,1/2,wt/wt,0.49 Wm-1K-1)composites.The λ in-plane(λ∥)and λ cross-plane(λ⊥)of 15 wt％BNN-30@BNNS-Ⅲ/Si-GFs/E-44 laminated compos-ites significantly reached 2.75 Wm-1K-1 and 1.32 Wm-1K-1,186.5％and 187.0％higher than those of Si-GFs/E-44 laminated composites(λ∥=0.96Wm-1K-1 and λ⊥=0.46Wm-1K-1).Established models can well simulate heat transfer efficiency in the BNN-30@BNNS-Ⅲ/Si-GFs/E-44 laminated composites.Under the condition of point heat source,the introduction of BNN-30@BNNS-Ⅲ fillers were conducive to accelerating heat flow transfer.BNN-30@BNNS-Ⅲ/Si-GFs/E-44 laminated composites also demonstrated outstanding electrical insulating properties(cross-plane withstanding voltage,breakdown strength,sur-face&volume resistivity of 51.3 kV,23.8 kVmm-1,3.7×1014 Ω&3.4×1014 Ω.cm,favorable mechanical properties(flexural strength of 401.0 MPa and ILSS of 22.3 MPa),excellent dielectric properties(ε of 4.92 and tanδ of 0.008)and terrific thermal properties(Tg of 167.3℃and THRI of 199.2℃).
其他文献
It is well documented that the strain rate sensitivity(m)increases at refined grain size for face-centered cubic(FCC)metals and alloys.Through a series of nanoindentation testing,however,we experimentally demonstrated a striking departure from conventiona
Core-shell materials are promising broadband electromagnetic(EM)absorption materials since the highly component manipulation performance,interfacial effect etc.Herein,a well-defined core-shell shaped structure constructed by 2-dimensional MOS2 nanosheets-
Flexible,lightweight,conductive materials,having both high rf losses and high permeability,are extremely desirable for applications as electromagnetic(EM)shielding.Gas atomized spherical FeSi-based ferromagnetic metallic particles,having a mean diameter o
Hydrogels with good antifouling and mechanical properties as well as biocompatibility have great appli-cation potential in the field of biomedicine.In this paper,a newly double network(DN)hydrogel was prepared based on zwitterionic material sulfobetaine m
To evaluate the potential of high entropy alloys for marine applications,a new high entropy alloy coating of AlCrFeNiW0.2Ti0.5 was designed and produced on Q235 steel via laser cladding.The microstructure,microhardness and tribological performances slidin
Tuned tin chalcogenides rooted in hierarchical porous carbon(HPC)with N-carbon coating layers are prepared by thermal shock under various temperatures(denoted as HPC-SnS2-PAN-Various T).With the increase of annealing temperature,the morphology and phase s
Severe plastic deformation(SPD)-induced gradient nanostructured(GNS)metallic materials exhibit supe-rior mechanical performance,especially the high strength and good ductility.In this study,a novel high-speed machining SPD technique,namely single point di
High entropy pyrochlores(HEP)are potential candidates as dispersoids in the oxide dispersed strength-ened steels or alloys,which can be used in nuclear reactors and supercritical boilers.For the first time,HEP oxides Y2(TiZrHfMoV)2O7 were synthesized with
It is a challenge to reduce the dielectric loss and increase the tunability of pure barium strontium titanate(BST)films for microwave tunable application because these two properties change simultaneously.Herein,a novel composite of strontium titanate(ST)
Using natural product-based antifouling coatings has proven to be an effective strategy to combat biofoul-ing.However,their antifouling mechanisms are still unclear.In this study,the antifouling mechanism of natural product-based coatings consisting of bi