Crack-healing and oxidation behavior of silicon nitride ceramics

Crack-healing behaviour of mullite/SiC/Y2O3 composites and its application to the structural integrity of machined components

“…However, a large self-crack-healing ability was successfully induced similar to that of Al 2 O 3 /SiC [5][6][7][8][9][10] and Si 3 N 4 /SiC [11][12][13][14][15][16] by adding 15-20 mass% nano-size SiC particles. [1][2][3][4] Especially, the mullite/SiC composite exhibits very interesting in situ crack-healing ability at 1273-1473 K. [17][18][19] In other words, the mullite/SiC can heal a crack even under 5 Hz cyclic stress and exhibit the same fatigue limit as the base material at the healing temperature.…”

Crack-healing ability of structural ceramics and a new methodology to guarantee the structural integrity using the ability and proof-test

“…6. 10,33 In short, T HL = 1573 K is for t HM = 25 respectively. The crack sizes of these three specimens are 2C 100 m, and they are healed in an air environment.…”

High temperature self-healing SiBCN ceramics derived from hyperbranched polyborosilazanes

“…In this field, the selfhealing behavior of various ceramics such as silicon carbide (SiC)/mullite [15,16], SiC/Al 2 O 3 [17,18], and C f /SiC ceramic matrix composites can be achieved by introducing hightemperature oxidation additives or boron-containing additives [19][20][21], such as silicon dioxide (SiO 2 ) [22], alumina (Al 2 O 3 ) [23,24], and boron carbide (B 4 C) [25]. The crack healing is mainly attributed to the formation of protective oxide film in the damaged area in ceramics or composites.…”