Effect of 1wt% LiF additive on the densification of nanocrystalline Y2O3 ceramics by spark plasma sintering

Densification and preservation of ceramic nanocrystalline character by spark plasma sintering

“…The SPS of nc-Y 2 O 3 at 100 MPa above 1400uC showed significant grain growth, where the large micrometre size grains were composed of subgrains with LAGBs; they resembled the annealed microstructure of the plastically deformed grains. 19,41 However, the nanocrystalline character could be preserved at the lower SPS temperatures as a result of the nanopore (arrowed in Fig. 4) drag on the GB mobility; this was confirmed by the theoretical calculations.…”

“…Such nanoparticle systems are often characterised by jamming effect during densification. [17][18][19] In systems with attractive forces between the nanoparticles, the particle sliding may be arrested by jamming via crowding of fractal clusters. 17 A similar physical aspect of the powder consolidation was modelled by buckling of the arches of particles surrounding the closed pores in the green compact.…”

X-ray induced color change on dense yttria samples obtained by spark plasma sintering

“…The available experimental data indicate that SPS-fabricated monolithic Y 2 O 3 generally benefits from such less severe processing conditions [20][21][22][23][24][25][26][27][28]. This work supports this claim, showing that highly dense Y 2 O 3 solids can be obtained at relatively mild sintering temperatures and short processing times.…”

Crystal Structure and Microwave Dielectric Properties of LiRE9(SiO4)6O2 Ceramics (RE = La,Pr,Nd,Sm,Eu,Gd, and Er)

“…Alkali halides, especially LiF, have been reported as effective sintering aids for microwave ceramics 33,34 and optically transparent polycrystalline ceramics. [35][36][37] The addition of 1 wt% LiF enhanced the densification above 90%. Figure 1 Fig.…”

“…In the present investigation, LiRE 9 (SiO 4 ) 6 O 2 ceramics also exhibited poor densification (60%). Alkali halides, especially LiF, have been reported as effective sintering aids for microwave ceramics and optically transparent polycrystalline ceramics . The addition of 1 wt% LiF enhanced the densification above 90%.…”