Investigation of the effect of ZrO2 and ZrO2/Al2O3 additions on the hot-pressing and properties of equimolecular mixtures of α- and β-Si3N4

Fabrication of highly dense Si3N4 via record low‐content additive system for low‐temperature pressureless sintering

“…Previously, several authors have reported a similar phenomenon, enhanced grain growth with higher additive content 48–50 . Ewais et al 48 . have reported an increase in the Si 3 N 4 grain growth with an increase in the ZrO 2 content.…”

“…Grain growth in Si 3 N 4 is diffusion‐controlled 47 , and therefore it is anticipated that the larger amount and higher viscosity of the liquid phase will favor larger grains. Previously, several authors have reported a similar phenomenon, enhanced grain growth with higher additive content 48–50 . Ewais et al 48 .…”

The role of coordination and valance states of tungsten ions on some physical properties of Li2O–Al2O3–ZrO2–SiO2 glass system

“…The addition of zirconia (ZrO 2 ) along with alumina to silicate glasses further expected to reinforce the mechanical properties in term of hardness. Additionally, for certain specific concentration ratios of Zr/Al, negative thermal expansion (NTE) was also reported in ZrO 2 and Al 2 O 3 mixed glasses [16].…”

Combustion of Ferrosilicon–Zircon Mixtures in Nitrogen Gas: Impact of Aluminum Additives

“…Due to their unique properties, silicon nitride (Si 3 N 4 ) and related composites (such as Si 3 N 4 -SiC, Si 3 N 4 -TiN, Si 3 N 4 -BN, Si 3 N 4 -MoSi 2 ) find wide application in mechanical engineering, cutting tools, chemistry, and radio electronics [1][2][3][4][5]. Since Si 3 N 4 is a hard-to-sinter material, several oxides have been suggested for use as sinter aids [6,7], including ZrO 2 [8][9][10].…”