Strength recovery of ground ceramics via electric furnace heating

Improvement in Contact Strength of Si3N4/SiC Composite by Crack Healing

“…Crack-healing behavior in machined ceramics has also been studied by several researchers. Wu et al [4] reported that an Al 2 O 3 /SiC composite showed a substantial increase in strength after grinding and heat treatment in air at 1250 ∘ C. Liu et al [5] reported that the heating of ground ceramic components made from alumina (Al 2 O 3 ) and silicon nitride (Si 3 N 4 ) in air can increase their fracture strength. Lee et al [6] reported that the numerous surface cracks resulting from the heavily machining of SiC-reinforced mullite can be completely healed by the crack-healing treatment.…”

Crack‐healing behaviour and resultant high‐temperature fatigue strength of machined Si3N4/SiC composite ceramic

“…It is well known that flawed ceramics recover strength by heat treatment 10–25 . The strength recovery is caused by the following three reasons; (1) by releasing the tensile residual stress, (2) by re‐sintering the flaws and (3) by self crack‐healing.…”

“…The strength recovery is caused by the following three reasons; (1) by releasing the tensile residual stress, (2) by re‐sintering the flaws and (3) by self crack‐healing. Matsuo et al 11 and Liu et al 12 reported that the release of the residual stress introduced by machining was not the dominant factor in strength recovery. Also, Ando et al 13 have already tested the effect of residual stress in Si 3 N 4 and Si 3 N 4 /SiC composite by heat treatment in argon and air.…”

“…8,9 It is well known that flawed ceramics recover strength by heat treatment. [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] The strength recovery is caused by the following three reasons; (1) by releasing the tensile residual stress, (2) by re-sintering the flaws and (3) by self crack-healing. Matsuo et al 11 and Liu et al 12 reported that the release of the residual stress introduced by machining was not the dominant factor in strength recovery.…”