CaCO_(3)의 함량이 건축용 내장 wall tile body의 물성에 미치는 영향
(The) Effects of CaCO_(3) Content on the Properties of Wall Tile Body
건축용내장 내장재료 재료공학 건축재료 벽타일;
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The calcite is one of major raw materials for the manufacturing of wall tile on fast kiln(R.H.K Kiln), and generally it's contained 9 ∼ 12wt% to the body. It's useful raw material for control some factors when applying of calcite to the wall tile body. Therefore, sometimes it's added more then 12wt% for control the bending, size, durability, and others. Normally, the effects of calcite on the properties of wall tile body are asfallowing 1. Thermal expansion of body is higher, 2. Increase the intermediate phase between body and glaze. 3. Decrease the moisture expansion of the body. But they are to be depended on firing temperature and firing cycle time. In the case of the manufacturing of wall tile on fast firing system with double firing process, above expectation were not sure. Because the firing condition is different from the long firing process, such as pottery and sanitary ware manufacturing. If the excess of calcite was applied than the amount of field limited, the properties of wall tile body depended on calcite were showed the different result from above general effects. If the amount of free CaO was increased in the body, sometimes, pinhole of leave alone the long time after glazing on the glazing line in summertime is occurred. Therefore, contained amount of free CaO is important. When applied amount of calcite was increased more then 12w%, free CaO was increased. Phenolphtalein solution (0.1 wt%) test showed the existence of the free CaO, but improve durability and bending after autoclave treated. In general, according to the moisture expansion was increased, the durability is decreased. But in this experiment, the free CaO improves durability and reverse bending, inspite of increase the moisture expansion. The reason of them is explained that the gap of thermal expansion between body and glaze is higher according to increase the amount of the applied calcite, and then the compressive stress of glaze is increased. So, new conclusion was obtained, that is, in the case of fast firing with double firing process for manufacturing wall tile, the increasing compressive stress effect is higher than increasing moisture expansion stress when increase the amount of applied calcite.