|
|
|
Journal of the Korean Ceramic Society 1997;34(2): 195. |
| Kaolinite-Aluminum Trihydroxide의 혼합물의 혼합분쇄효과 및 Mullite의 생성에 미치는 영향 |
| 류호진 |
| 한국화학연구소 무기소재연구부 |
| Mixed Grinding Effect on Kaolinite-Aluminum Trihydroxide Mixture and Its Influence on Mullite Formation |
|
|
|
|
|
|
|
| ABSTRACT |
|
The present paper describes the effect of dry mixed grinding on kaolinite-aluminum trihydroxide mixture with a planetary ball mill before sintering and its influence on mullite formation during sintering. The size reduction of the mixture is market in the early stage of grinding and the obtained fine particles agglomerate subsequently with an increase of grinding time. The crystal structure of the mixture is collapsed easily into an amorphous one by planetary ball milling, of which amount increases with an increase of grinding time. Only mullite phase except for anatase as an inherent impurity in kaolinite appeared in the sintered body of the mixtures with mixed grinding as relatively lower temperature 1523K, while corundum, cristobalite, and Al-Si spinel phases, besides mullite were formed in the sintered body of the mixture without mixed grinding. Therefore, the mixed grinding treatment is very effective to improve the homogeneous mixing and disp-ersion of the mixture of raw materials on a micro scale and to decrease the thermal decomposition tem-perature by crystal structure change of them so as to obatin direct preparation of mullite with high purity at relatively low temperature. |
| Key words:
Mullite, Kaolinite, Aluminum, trihydroxide, Mixed grinding, Thermal expansion coefficient |
|
|
|
PDF Links
Full text via DOI 
Download Citation 
