Transparent YAG ceramics by surface softening of nanoparticles in spark plasma sintering

Effect of sintering temperature on optical properties and microstructure of translucent zirconia prepared by high-pressure spark plasma sintering

“…Usually the pore scattering significantly affects the transparency of ceramics [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. However, annealing experiments on SPS samples indicate only a weak effect of residual pores on transparency [10][11][12].…”

“…To restrain grain growth, spark plasma sintering (SPS) is used as an alternative method to prepare transparent c-YSZ [9][10][11][12], as well as other transparent ceramics, such as Al 2 O 3 [13][14][15][16][17][18][19][20][21][22], MgAl 2 O 4 [23][24][25][26][27], Y 3 Al 5 O 12 [27][28][29], MgO [30] and 3Al 2 O 3 · 2SiO 2 [31,32]. Garay and co-workers [9,10] reported that nanograined transparent c-YSZ could be produced by SPS at a moderate pressure of 141 MPa.…”

Sintering to Transparency of Polycrystalline Ceramic Materials

“…Thus, it is possible to fabricate a dense material with an average grain size similar to starting powders. There are many scientific works showing the potential of this technique for obtaining a wide diversity of transparent polycrystalline materials (B. N. Kim et al, 2007), (C. Wang et al, 2009), (G. Zhang et al, 2009), (R. Chaim et al, 2006). Nowadays, one of the challenges related with this technique is the scaling-up in order to obtain large samples or complex shape components.…”

Advanced Sintering of Nano-Ceramic Materials

“…However, at the same time the grainboundary framework in SPS-derived nanoceramics is often underdeveloped (H. Park, 2006), raised questions whether the atomistic mechanisms active by conventional heating change due to the nature of the SPS process. In this respect, enhanced densification kinetics observed in YAG (Y 3 Al 5 O 12 ), was analyzed in terms of particle surface softening due to the plasma (R. Chaim et al, 2006). Such a behavior originated most probably from the extremely high creep resistance of YAG prohibiting plastic deformation, and its high electrical resistance enhancing charging and discharge at the particle surfaces.…”