Granular Computing Committee of Chinese Society of Granular Engineering (Preparatory)
Hohai University
Monash University
Start Time：Pending （Asia/Shanghai）
Duration：Pending
Session：[No Session] » [No Session Block]
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| The development of the electronic industry has brought great challenges to thermal management materials, requiring them to have higher performance, sustain extreme conditions, and become more durable in various environments. Among them, boron nitride nanosheet (BNNS)-based thermal management materials have attracted widespread interests due to their high thermal conductivity, insulating, and low dielectric properties. However, the increasing challenges brought by advanced applications can hardly be fulfilled by current synthesizing strategy due to the use of polymer binders which interconnect nanosized boron nitride nanosheets to assemble macroscale thermal management materials. The use of polymer binders, despite providing convenience in processing and design free, compromises the excellent properties of boron nitride nanosheets, deteriorating their thermal conductivities, thermal/chemical stability, durability, and longevity, which are increasingly indispensable in many scenarios such as fast charging, battery system, and power electronics. On the other hand, BNNS is a ceramic material that can be sintered into monolithic, which provides solid sintering bonding to assemble materials. However, due to the poor control in sintering process and the necessity to apply high pressure, its products and applications are limited. In this report, a novel “assemble-solder” strategy is proposed which combines the synthesis strategy of 2D and ceramic materials to fabricate boron nitride nanosheets into macroscale all-ceramic assemblies. This strategy involves the fabrication of structures based on the great processability of 2D materials and the formation of sintering bonding based on the ceramic nature. In this process, separated BNNSs in the elaborate structures assemblies are rapidly bonded by ultrafast sintering with high heating/cooling rates in seconds, leading to a flash-soldering-like process. The resulting all-ceramic boron nitride nanosheets thermal management materials also demonstrate combined advantages of both 2D and ceramic materials, thus fulfilling the requirements abovementioned. In this thesis, boron nitride nanosheets assemblies from 2D to 0D were synthesized to demonstrate the feasibility, application, and potential of this strategy. |
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