[Retracted] A Comparative Study on Crack-Healing Ability of Al₂O₃/SiC Structural Ceramic Composites Synthesized by Microwave Sintering and Conventional Electrical Sintering

Table 1

Flexural strength of smooth, cracked, and crack-healed conventional electrical sintered and microwave sintered Al₂O₃/SiC ceramic composites.

Condition	Wt. % of		Flexural strength σ in MPa
	Al2O3	SiC	Conventional electrical sintering	Microwave sintering
Smooth specimen	95	5	302 ± 23	318 ± 32
	90	10	592 ± 34	624 ± 38
	85	15	512 ± 18	543 ± 28
	80	20	467 ± 42	508 ± 18
Cracked specimen	95	5	212 ± 38	203 ± 33
	90	10	242 ± 26	257 ± 42
	85	15	287 ± 18	312 ± 18
	80	20	262 ± 28	315 ± 22
Cracked + healed	95	5	427 ± 32	488 ± 41
	90	10	758 ± 24	794 ± 32
	85	15	647 ± 14	658 ± 34
	80	20	596 ± 21	623 ± 26