Enhanced interfacial wettability and mechanical properties of Ni@Al2O3/Cu ceramic matrix composites using spark plasma sintering of Ni coated Al2O3 powders

Poor wettability and weak interfacial bonding between Cu Al 2 O 3 have been critical issues for sintering of high-quality Ni@Al /Cu composites. In this paper, we explore an engineering design methodology to achieve good mechanical properties composites using spark plasma method. The Ni coated powders were prepared a heterogeneous precipitation method, which can significantly improve enhance their bonding. sintered with copper content 15 vol% showed compact network structure alumina well-infiltrated metallic Cu, achieved (e.g., fracture toughness 6.72 MPam 1/2 ) physical relative density 99.3% electrical resistivity 1.2810 −3 Ω m). key mechanisms the enhanced synthesized composite identified as: (1) well-formed ceramic/metal structures promote formation homogeneous structure; (2) elemental diffusion reactions, result in CuAlO thus wetting properties. • successfully Provides TEM pictures interfaces phases.