Abstract
Si 3N 4/TiN nanocomposites ceramic tool materials were sintered under 30 MPa at 1650 °C for 40 min. The effects of nano-scale TiN on the mechanical properties and microstructure were investigated. The strengthening and toughening mechanisms of Si 3N 4/TiN nanocomposites were studied by observing the fracture surfaces, samples for TEM and cracks. The oxidation resistance of Si 3N 4/TiN nanocomposites was also discussed based on the observation of microstructure. The results showed that the elongated Si 3N 4 grains which were pulled out from the fracture surfaces were reduced with the increase of the addition of nano-scale TiN, and many intragranular TiN grains were observed in Si 3N 4/TiN nanocomposites. The greater crack deflection and microcrack provided the contributions to the strengthening and toughening mechanisms for Si 3N 4/1 vol%TiN nanocomposite. However, Si 3N 4/TiN nanocomposites were oxidized strongly at higher temperature.
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