Microstructural evolution of a commercial ultrafine alumina powder densified by different methods

Effect of alumina contents on phase stability and mechanical properties of magnesium fluorapatite/alumina composites

“…It should also be noted that alumina is harder than MFA. In the present work, the composite samples showed higher hardness values compared to those reported in the literature; this difference may be due to the conventional sintering process used in previous studies (Evis and Doremus, 2007;Golestani-fard et al, 2011). However, as the TSS process was used in this study, hardness and fracture toughness increased due to grain growth suppression while nonosized components were also observed in the composite samples.…”

Grain Boundary Nanohardness of Coarse Grain Alumina

“…Taimicron grade alumina powders are ultrafine powders with high purity >99.99%. These powders have been reported by many researchers to be sinterable to near about theoretical density at a sintering temperature of approximately 1300°C. As a matter of fact one of the present authors and his other coworkers have shown way back in 1993 that the same variety of alumina can be sintered to high density at a temperature of as low as 1310°C, that is, the same temperature as the one used in the present work.…”

“…Taimicron alumina powders are well known as commercially available ultrafine powders with purity higher than 99.99%. These powders can densify to near about theoretical density at a sintering temperature of even as low as approximately 1275°C . The powders had a surface area approximately 14.5 m 2 /g.…”

Effect of Ca2+ Substitution on the Structure, Microstructure, and Microwave Dielectric Properties of Sr2Al2SiO7 Ceramic

“…In all cases, the grain size varied in the range from ~1 to ~20 μm and no secondary phase was visible. It has previously been reported that excellent densification can only be achieved for the sintered ceramic compacts with fine and narrow grain‐size distributions. The difficulty in achieving excellent densification (98% or above) for these compounds can be correlated with the observed nonuniform distribution of grain sizes.…”