Purpose. The research focuses on the improvement of local clay-based ceramic pottery bodies from Alas Angker in Buleleng Regency in Bali. The main purpose is to utilize the clay which meets the standards of ceramics such as smooth and hard earthenware, especially to reduce its water absorption property. Methods. Firstly, the clay is analyzed for its physical and chemical composition. Two ceramic body formulations are made using the clay with the BWNAA1 and BWNAA2 codes. The specimens are measured in terms of clay ceramics properties including plasticity, dry shrinkage, firing shrinkage and water absorption. The cracked ceramic products are also analyzed for a comparison. Findings. The ceramic properties show similar results, except for the water absorption percentage. The BWNAA2 code formulation has lower water absorption rate by 10.8% and meets the requirements for the type of smooth and hard earthenware body in compliance with the national standard SNI:7275-2018. The water absorption rate is about half of the existing products, which is effective in avoiding the problem of cracks. Originality. Comparison of the existing ceramic products and specimens made in this study shows a significant difference in water absorption and crack growth. Adding a certain amount of kaolin, feldspar, ball clay and quartz sand has significantly reduced the water absorption rate of ceramic bodies. Practical implications. This research can be a potential solution to increase the quality of ceramic pottery products in the vicinity of Buleleng Regency which use the clay of this kind.
Have been made three glazes which using 2 (two) raw colorant materials, oxide of cobalt and copper oxide. In the glaze, copper oxide from 0,1 % to 0,25 % (weight) while oxide of cobalt equal to 0,10 % (weight). Usage of copper oxide which equal to almost 3 (three) times fold in the reality cannot make dominant green color yielded glazes, even color of greenish blue even also cannot be obtained. Color of the glaze is young blue, indicating that oxide of cobalt more effective as colorant than copper oxide The glaze have maturity which enough at firing temperature 1250 o C, having value of L = 68,70, a* from -0,05 to -0,28 and b* = -0,40. This value show that the glazes have green color spectrum (marked with value of a* negative) and blue (marked with value of b* negative) and also its young color (marked with value of L* high) Kata kunci: oksida kobal, tembaga, glasir kelabu muda 1. PENDAHULUAN
The research on "The Effect of the addition of sawdust on the physical properties of ceramic body of Kidul clay-based Earthenware " has been performed with different percentages. The sawdust used is wood shavings waste ofbuilding materials. Based on the results ofehemical analysis, sawdust is known to have a tendency as a fuser, whereas Kidul clay contain enough clay substance / loam, feldspar and quartz minerals. This study aims to determine the physical properties of the composite body period, either in a state of pre-combustion and post-combustion as ceramics earthenware. The produced ceramic objects can be used as a container of crop water by permeation techniques. So what is sought is a composition with a value permeation / absorption ofwater / the greatest PA. To observe its physical properties, measures of laboratory scale study was conducted by testing the bricks and the scale of production through prototype test. The result is in accordance with the purpose that is the body mass of BG1 code that has been qualified as Earthenware ceramics at a fuel temperature of l.l50oC with a value PA = 20.2% (SNI: 7275-2008, PA> 15% categorized as soft delicate earthenware or mayolika, while SII: 0803-83, PA> 20% is categorized as smooth soft earthenware with fuel temperature ofl000oC). However, further research still needs to be done with the addition ofan adjuvant sawdust with varied percentages in addition to testing with various forms ofdesign in order that in terms of aestheties and function the earthenware ceramic objects later become more meaningful.Key words: Kidul clay, sawdust, earthenware, water absorption, shrinkage amount
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