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http://dx.doi.org/10.4191/KCERS.2004.41.10.723

Gas Pressure Sintering, Mechanical Properties and Microstructure of Three Binds of Si3N4 Ceramics  

Ha, Sung-Soo (School of Advanced Materials Engineering, Andong National University)
Kim, Chang-Sam (Multifunctional Ceramics Research Center, Korea Institute of Science and Technology)
Cheong, Deoek-Soo (Multifunctional Ceramics Research Center, Korea Institute of Science and Technology)
Publication Information
Journal of the Korean Ceramic Society / v.41, no.10, 2004 , pp. 723-727 More about this Journal
Abstract
Three kinds of $Si_3N_4$ powders (M-11, SN-ESP, and SN-E10) were gas-pressure sintered at $1700-1900^{\circ}C$ for 2 h under 18 atm $N_2$. Their densification behavior was investigated and compared as well as the mechanical properties and microstructure of the resulting ceramics. SN-ESP and SN-E10 started to reach nearly full densification at $1750^{\circ}C$ and showed almost no decomposition up to $1900^{\circ}C$. In contrast, M-11 was not fully densified until $1800^{\circ}C$ and showed about $3\%$ weigh loss at $1900^{\circ}C$ indicating poor thermal stability. SN-ESP and SN-E10 showed much higher strength both at room temperature and $1200^{\circ}C$ than M-11 when fully densified. Compared with SN-ESP, SN-E10 was not only a little better in strength (both at room temperature and $1200^{\circ}C$) and fracture toughness but also much higher in the Weibull modulus due to more interlocked microstructure by well elongated grains.
Keywords
Gus pressure sintering; Densification behavior; Mechanical properties; Microstructure;
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