J. Korean Ceram. Soc. > Volume 34(5); 1997 > Article
 Journal of the Korean Ceramic Society 1997;34(5): 544.
 감압조형시 흑연첨가 및 주입온도가 피복상태에 미치는 영향 조성준 배재대학교 신소재공학부 The Effect of Graphite Addition and Pouring Temperature on the Coating State in Vaccum Process ABSTRACT We tried to improve the coating capability of the coating material using an additive(hexagonal cystalline graphite) of 2%, 3%, 4% and 6% under various pouring temperature for the easy isolation of sand and coating material from the final product. As a result in case of using a 2% and 3% additive generally no burning state has been occurred under the low pouring temperature, but it has been gradually increased with the pouring temperature. On the other hand in case of using a 4% and 6% additive there has been no burning state through out the whole pouring temperature. From this result we could see that the best state of the final product without sand and coating material could generally be obtained if 4% and/or 6% of the crystalline graphite and the pouring temperature of 140$0^{circ}C$$pm$5$^{circ}C$ would be used. Key words: Coating capability, Hexagonal crystalline graphite, Pouring temperature, Sand, Coating material
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