The dissolution rates of silicon nitride (Si3N4) ceramics into CaO-Al2O3-SiO2 slags were investigated by using a rotating specimen method in the temperature range of 1773-1873 K. Dissolution rates in the present study increased as the revolution speed and temperature increased and decreased as the SiO2 content of the slags increased. The nitrogen content of the slags increased after the Si3N4 ceramics had been immersed into them. The slags contained two types of nitrogen ions - N3- and CN- - because a graphite crucible was used for the experiment. N3- ions were confirmed in all the slags that were used in the present work; the CN- content was much lower than that of the N3- ions, except in the slag without SiO2. Based on those results, Fick's law of diffusion was used to analyze the dissolution rates. The dissolution mechanism of the Si3N4 ceramics into CaO-Al2O3-SiO2 slags has been discussed in this paper.
|Number of pages||8|
|Journal||Journal of the American Ceramic Society|
|Publication status||Published - Apr 1997|
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry