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http://dx.doi.org/10.3740/MRSK.2004.14.5.358

Synthesis of Si3N4 from Domestic Silica-stone by Direct Nitriding Method  

Sohn Yong-Un (한국지질연구원 자원활용소재연구부)
Joo Sung-Min (단양석회석신소재연구재단 연구개발실)
Chung Hun-Saeng (한국지질연구원 자원활용소재연구부)
Publication Information
Korean Journal of Materials Research / v.14, no.5, 2004 , pp. 358-362 More about this Journal
Abstract
$Si_3$$N_4$ ceramics have been identified as one of the promising structural ceramics. This study has been carried out to investigate of the synthetic behaviors of $Si_3$$N_4$ derived from domestic silica-stone by direct nitriding method. The silicon nitridation reaction has been studied in the temperature range of $1300～1550^{\circ}C$. Below the $1400^{\circ}C$, the nitriding rate was measured to be 16%. For the temperatures higher than the $1400^{\circ}C$, $\beta$-$Si_3$$N_4$ phase was formed mainly, and the nitriding rate showed above 98%. With the increasing of sample weight of silicon powder, the nitriding rate and $\beta$-$Si_3$$N_4$ phase increased at $1400^{\circ}C$ for 2 hours. The shape and particle size of$ Si_3$$N_4$ powder synthesized at $1400^{\circ}C$ for 2 hours showed the irregular angular-type and 10 $\mu\textrm{m}$, respectively.
Keywords
${Si_3}{N_4}$; domestic silica-stone; silicon powder; direct nitriding method;
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