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http://dx.doi.org/10.4191/kcers.2011.48.5.384

Densification and Mechanical Properties of Silicon Nitride Containing Lu2O3-SiO2 Additives  

Lee, Sea-Hoon (Engineering Ceramics Research Group, Korea Institute of Materials Science)
Jo, Chun-Rae (Engineering Ceramics Research Group, Korea Institute of Materials Science)
Park, Young-Jo (Engineering Ceramics Research Group, Korea Institute of Materials Science)
Ko, Jae-Woong (Engineering Ceramics Research Group, Korea Institute of Materials Science)
Kim, Hai-Doo (Engineering Ceramics Research Group, Korea Institute of Materials Science)
Publication Information
Journal of the Korean Ceramic Society / v.48, no.5, 2011 , pp. 384-389 More about this Journal
Abstract
Gas pressure sintering (GPS) of reaction bonded silicon nitride (RBSN) was performed using $Lu_2O_3-SiO_2$ additive and the properties were compared with those of specimens prepared using high purity $Si_3N_4$ powder. The relative density of RBSN and compacted $Si_3N_4$ powder were 68.9 and 47.1%, and total linear shrinkage after sintering at $1900^{\circ}C$ were 14.8 and 42.9%, respectively. High nitrogen partial pressure (5MPa) was required during sintering at $1900^{\circ}C$ in order to prevent the decomposition of the nitride and to promote the formation of SiC. The relative density and 4-point bending strength of RBSN and $Si_3N_4$ powder compact were 97.7%, 954MPa and 98.2%, 792MPa, respectively, after sintering at $1900^{\circ}C$. The sintered RBSN also showed high fracture toughness of 9.2MPam$^{1/2}$.
Keywords
Additives; Densification; Gas pressure sintering; Silicon nitride; Strength;
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Times Cited By KSCI : 1  (Citation Analysis)
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