Intra‐Type Nanocomposites for Strengthened and Toughened Ceramic Materials - Progress in Nanotechnology - Wiley Online Library

This chapter proposes a new concept of strengthened and toughened mechanisms in ceramic matrix nanocomposites. It was clarified that intra-type nanocomposites has a useful structure to improve fracture strength and fracture toughness of ceramic materials. In this work, we used a-alumina with average grain size of 260 |im and M0O₃ with purity 99.9 % as starting materials. We mixed alumina powder and neutralized M0O₃ solution with ethanol after dissolving M0O₃ in 28 % ammonia solution. We fabricated alumina-molybdenum nanocomposites using a Pulse Electric Current Sintering (PECS) method. The results showed that the maximum values of fracture strength and fracture toughness of the specimens sintered at 1450°C were 860 MPa and 5.22 MPam^1/2, respectively. The fracture toughness increased to 5.67 MPa-m after annealing at 800°C for 10 min because dislocations diffused in the matrix.

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Intra-Type Nanocomposites for Strengthened and Toughened Ceramic Materials

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Intra-Type Nanocomposites for Strengthened and Toughened Ceramic Materials

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