“…Because of their different additive contents and processing/sintering, the ceramics have different grain boundary phase amounts and compositions. Studies of the corrosion resistance of Si 3 N 4 materials revealed a strong relationship between the stability of the grain boundary and the corrosion resistance of the ceramic material (Galuskova et al, 2011b;Herrmann & Schilm, 2009;Herrmann et al, 2006;Herrmann, 2005;Herrmann, 2012;Kitaoka et al, 1994;Kleebe et al, 1993;Nagae, Koyama, et al, 2006;Sato Figure 14 Potential effect of corrosion on the integrity of zirconia components (after Chevalier et al, 2009Chevalier et al, ). et al, 1988aChevalier et al, , 1988bSato et al, 1992;Schilm et al, 2003;Schilm et al, 2004a;Schilm et al, 2006;Schilm et al, 2007;Schilm, 2004;Seipel & Nickel, 2003;Shimada & Sato, 1989;Somiya, 2001).…”