Cellular ceramic structures(CC5s)are promising candidates for structural components because of their low density and superior load-bearing capacity.However,the brittleness and poor energy-absorbing ability of CCSs sev...Cellular ceramic structures(CC5s)are promising candidates for structural components because of their low density and superior load-bearing capacity.However,the brittleness and poor energy-absorbing ability of CCSs severely llmit thelr applications.Insplred by composites in natural materials,whose stiff and tough constituents are arranged in a dual phase interpenetrating architecture,we proposed a dual phase interpenetrating architecture to achieve superior strength and toughness of CCSs simultaneously.Polyurea-toughened Al_(2)O_(3)CCSs(P/CCSs)were fabricated via three-dimensional(3D)printing and infiltration.The effects of the structural configuration and relative density on the mechanical properties of P/CCSs under quasi-static and dynamic compressive loading were systernatically discussed.It was demonstrated that polyurea effectively improved the mechanical properties of CCSs.The load-bearing capacity and energy-absorbing ability of P/CCSs under quasi-static compressive loading were 1.22-3.64 and 57-519 times those of CCSs.Additionally,the dynamic compressive strength and energy absorption of P/CCSs were 1.07-1.85 and 3.31-10.94 times those of CCSs.Furthermore,owing to the incorporation of polyurea,P/CCSs maintained structural integrity under large deformation,rather than undergoing catastrophic fracture.This work provides an effective solution to mitigate the adverse effects of ceramic brittleness,rendering P/CCSs promising candidates for structural components that require superior load-bearing capacity and energy-absorbing ability simultaneously.展开更多
基金supported by the National Natural Science Foundation of China(No.52275310).
文摘Cellular ceramic structures(CC5s)are promising candidates for structural components because of their low density and superior load-bearing capacity.However,the brittleness and poor energy-absorbing ability of CCSs severely llmit thelr applications.Insplred by composites in natural materials,whose stiff and tough constituents are arranged in a dual phase interpenetrating architecture,we proposed a dual phase interpenetrating architecture to achieve superior strength and toughness of CCSs simultaneously.Polyurea-toughened Al_(2)O_(3)CCSs(P/CCSs)were fabricated via three-dimensional(3D)printing and infiltration.The effects of the structural configuration and relative density on the mechanical properties of P/CCSs under quasi-static and dynamic compressive loading were systernatically discussed.It was demonstrated that polyurea effectively improved the mechanical properties of CCSs.The load-bearing capacity and energy-absorbing ability of P/CCSs under quasi-static compressive loading were 1.22-3.64 and 57-519 times those of CCSs.Additionally,the dynamic compressive strength and energy absorption of P/CCSs were 1.07-1.85 and 3.31-10.94 times those of CCSs.Furthermore,owing to the incorporation of polyurea,P/CCSs maintained structural integrity under large deformation,rather than undergoing catastrophic fracture.This work provides an effective solution to mitigate the adverse effects of ceramic brittleness,rendering P/CCSs promising candidates for structural components that require superior load-bearing capacity and energy-absorbing ability simultaneously.
