Kinetics of rare earth incorporation and its role in densification and microstructure formation of α-Sialon

Effect of cubic boron nitride grain size in the reinforcing of α-Sialon ceramics sintered via SPS

“…The superior properties of Sialon ceramics are known widely to be high strength and wear resistance, low density, high thermal stability and oxidation resistance, low coefficient of friction and high resistance to chemical corrosion. [1][2][3][4] The ␣-Sialon phase (M x Si 12−(m+n) Al m+n O n N 16−n , where x = m/v, v being the valance of the cation M +v , M = Li, Mg, Ca, Y and some rare earth elements Z > 60) has the same structure as ␣-Si 3 N 4 . This structure is stabilised by the simultaneous incorporation of the cation M along with Al and O into the ␣-Si 3 N 4 -lattice.…”

“…Al and O partially replace Si and N, whereas the stabilising cation M occupies an interstitial hole in the lattice. 2,3,[5][6][7] The * Corresponding author. Tel.…”

“…The existence of a small amount of a stable liquid is important for the complete densification. 3,8 The use of multi-cation ␣-Sialons compositions has been shown to be beneficial in lowering the eutectic temperature of the Sialon systems, additionally resulting in faster ␣-Sialon precipitation. 9,10 However a migration of the cations can take place depending on their size i.e., in Ca, Mg doped Sialon materials the Ca 2+ ions were mainly incorporated into the ␣-Sialon structure whereas the Mg 2+ ions were found predominately in Sialon polytypoids illustrating the fact that the phase formation of single and multi-cation systems varies.…”

The Peculiarities of Structure Formation and Properties of Zirconia-Based Nanocomposites with Addition of Al2O3 and NiO

“…So, the structure of material, in our case ceramic material, must withstand external shocks. For example, these are self-healing materials [1, 2]. The corrosion resistance of silicon nitride ceramics can be increased by modifying its secondary phase.…”

Processing, Characterization and Mechanical Properties of SiAlONs Produced from Low Cost <i>β</i>-Si₃N₄ Powder

“…Powder processing stage has a strong effect on microstructural development, since ceramic parts are produced by the sintering of initial powder mixtures [8][9][10][11][12] . Removal of impurities from the raw powders, initial particle size distribution, homogeneous dispersion of sintering additives, and grinding of starting nonoxide powders are the important parameters in the microstructural formation of SiAlON materials with superior mechanical properties [13][14][15][16][17][18][19] . SiAlON production processes are based on homogenization of raw powders α or -Si 3 N 4 powder, Al 2 O 3 , AlN and sintering additives such as Y 2 O 3 , Sm 2 O 3 , Er 2 O 3 , Dy 2 O 3 , CaO, etc.…”