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http://dx.doi.org/10.3795/KSME-A.2009.33.9.957

Characteristics of Crack Healing and High Temperature Strength of High Strength Sialon  

Nam, Ki-Woo (부경대학교 신소재공학부)
Park, Sang-Hyun (부경대학교 대학원)
Park, Seung-Won (부경대학교 대학원)
Moon, Suk-Jae (부경대학교 대학원)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.33, no.9, 2009 , pp. 957-962 More about this Journal
Abstract
Sialon was produced by hot-pressing the mixtures of $Si_3N_4$, AlN and $Y_2O_3$ powders. All fracture tests were performed on a three-point loading system with a 30 mm bending span. Fracture toughness and Vickers hardness of smooth specimen were average 7.05 $MPa{\cdot}m^{0.5}$ and Hv = 1580, respectively. Density of three kinds of specimens, smooth specimen, smooth and healed specimen, smooth with $SiO_2$ colloidal coating and healed specimen, had beyond 99 % of theoretical density. Bending strength of smooth healed specimens had high strength more than 1 GPa. Crack healed specimens recovered as strength as smooth specimen. That is, cracked specimen with $SiO_2$ colloidal coating on cracked part recovered strength by heat treatment, completely. Crack healing of $Si_3N_4$ composite ceramics had contributed glassy $SiO_2$ to strength recovery. Limiting high temperature for bending strength of heat treated smooth specimen for bending strength was about 1273 K.
Keywords
Sialon; High Strength; Crack Healing; Strength Recovery; $SiO_2$Colloidal; High Temperature Strength;
Citations & Related Records

Times Cited By SCOPUS : 1
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