Spark plasma sintering of mullite: Relation between microstructure, properties and spark plasma sintering (SPS) parameters

Translucent Yttria‐ and Silica‐Doped Mullite Ceramics with Anisotropic Grains Produced by Spark Plasma Sintering

“…The remaining pores might act as crack deflectors and energy dissipaters. Such an observation was previously made by Ghahremani et al, 34 who SPSed pure mullite powder at 1700°C, and was also detected in moderately porous zirconia ceramics. 35 Nevertheless, the overall moderate indentation toughness can be explained by the fact that after the observation of the cracks induced by the Vickers prism (not shown), it seemed that the larger anisotropic grains were not able to make a significant number of deflections of the propagating cracks.…”

Preparation of plasma sprayed mullite coating on stainless steel substrate and investigation of its environmental dependence of friction and wear behavior

“…The Vickers hardness of the as-prepared mullite coating (prepared by mullite powder 1) is 651.2745.7 HV 3 N , and it is far below that of bulk mullite (1256 HV [18]). The phenomenon can be understood by the fact that the indentation response of plasmasprayed coating is governed not only by the intrinsic hardness of the material but also by the special microstructure of the deposited coating, such as a certain amount of pores and lamellar structure.…”

Effect of temperature on the reaction sintering of mechanically activated ZrSiO4–Al2O3 mixture

“…Mullite is an important ceramic and has attracted considerable attention due to its high melting point, chemical stability, low thermal expansion, high creep and thermal shock resistance, attractive bending strength at high temperatures, resistance to abrasion and good electrical resistivity [1,2]. However, low fracture toughness and difficulty in sintering limits its widespread usage [3].…”