การประชุมวิชาการระดับชาติ ครั้งที่ 16
มหาวิทยาลัยราชภัฏนครปฐม

The objective of this study was to compare the effects of different firing atmospheres of glazes made from corn cob ash obtained from the National Corn and Sorghum Research Center (Suwan Farm) in a pottery kiln and to evaluate quality of the glaze applied on pottery products. The glaze formula used consisted of a ratio of 33:33:34 percent by weight of three materials which are: corn cob ash, ball clay, and potassium feldspar. These materials were coated on stoneware pottery products fired at a temperature of 1,280 degrees Celsius in both oxidation and reduction firing atmospheres. The properties of the glaze were analyzed according to the standards of TIS 564 - 2003 for ceramic containers used for food, specifically porcelain. These properties included resistance to scratching, resistance to rapid temperature changes, water absorption, and Physical analysis by five qualified individuals.

 

The research findings showed that glazes fired in an oxidation atmosphere exhibited surface erosion before testing for scratch resistance and resistance to rapid temperature changes. The water absorption rate was 0.24 percent. On the other hand, glazes fired in a reduction atmosphere showed no signs of erosion or surface damage, and the water absorption rate was 0.1 percent in the first round of testing, consistent with the qualitative research findings of the five qualified individuals. External examination of the glaze revealed that oxidation-fired glazes had an uneven surface texture, while reduction - fired glazes had a glossy, distinctive appearance with a smooth surface texture.