Effect of ball milling on reactive spark plasma sintering of B4C–TiB2 composites
Source abstract
Abstract
Abstract The influence of mechanical activation by ball milling (BM) of Ti, B and graphite powders mixture on the synthesis of dense B 4 C-41% vol. TiB 2 composite by Spark Plasma Sintering (SPS) is investigated. BM treatment produces grains size refinement (50–150 nm) in the processing powders and the formation of TiB and TiB 2 , when milling times are longer than 6 h. The synthesis process occurs through a solid-state diffusion mechanism where the first crystalline phase formed is TiB, which is gradually converted to TiB 2 , while the formation of B 4 C takes place subsequently. The complete conversion of unmilled reactants is reached at about 1500 °C, while this goal is achieved at 1100 °C when using 3 h milled powders. A near to fully dense product with fine grained microstructure (down to submicrometer level) and homogeneous phases distribution is obtained by SPS when starting from 8 h milled powders, if the applied current intensity does not overcome 1150 A.
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Research context
OpenAlex topics: Advanced ceramic materials synthesis · Advanced materials and composites · Boron and Carbon Nanomaterials Research
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