Corn Cob Ash Glaze from The National Corn and Sorghum Research Center (Suwan Farm)

Abstract

This research main purpose is to demonstrate and study general characteristics. and physical quality of the corn cob ash glaze on pottery in different firing atmosphere at the National Corn and Sorghum Research Center (Rai Suwan). Evaluate the quality of glaze on the formula in a mixture of 33: 33 : 34, using 3 raw materials that are corn cob ash, ball clay and potassium feldspar. The glaze was applied to stoneware pottery products and fired at a temperature of 1,280 degrees Celsius in both oxidation and reduction firing atmospheres. The study analyzed physical quality by five experts to test if the glaze were qualified TIS 564-2003 standards, the qualification for ceramic food container of TIS standard must be 1. resistance to cracking 2. resistance to sudden temperature changes 3. water absorption. The results showed that an oxidation firing exhibited cracks on the coating for both cracking resistance and sudden temperature change also 0.24% for water absorption. On the other hand, reduction firing exhibited no cracks or corrosion resistance, and found cracks on the coating with approximately 0.1% for water absorption. Consistent with the general results from the five experts, it was found that the glaze fired in an oxidation firing had an uneven surface, whereas glazes fired in a reduction firing had a unique luster and a smooth surface