Bulk monolithic zirconium and tantalum diborides by reactive and non-reactive spark plasma sintering

摘要: Abstract Monolithic ZrB 2 and TaB were produced starting from the precursors through Self-propagating High temperature Synthesis followed by Spark Plasma Sintering (SHS–SPS) means of Reactive (RSPS). Both methods enabled to achieve almost fully dense ceramics with mean grain size typical pure bulks. materials displayed significant differences in final products obtained two routes, while a satisfactory homogeneity was reached both cases. This confirmed good mechanical strength values, about 400 MPa at room temperature, basically maintained up 1200 °C. On other hand, sintered quite diverse, particular /RSPS showed dual distribution size, along an no residual porosity, whilst /SHS–SPS had more homogeneous diffused trapped porosity which corrupted oxidation performances.