องค์ประกอบของเถ้าแกลบและดินดำในลูกบอลฉนวนสำหรับการป้องกันออกซิเดชันในกระบวนการรีดเหล็กหล่อ / สุรเชษฐ์ ปัณฑิตานนท์ = Composition of rice husk ash and ball clay in insulating balls for oxidation prevention in rolling cast iron process / Surachet Pantitanonta
The objective of this research is to study vanous composition of rice husk ash and ball clay in insulated ball. The appropriate ratio of insulating balls is 7:3 without moisture. For molding, the appropriate ratio of dry raw material to tapioca binders is 1:1 by using rolling process which produce 8 mm diameter of insulating balls. The strength of the insulating balls was found in range of 100-120 N/cm2 depends in the ratio of rice husk ash to ball clay. The thermal conductive condition of insulating balls is thermal insulation and the thermal conductivity is 0.05 W/m.K The insulating ball was test in temperature range 700-800 ℃. It found that it was broken in small particles because of the pressure of volatile matter and being burn of tapioca binders. Therefore, the prepared insulating balls could be well application oxidation prevention in rolling cast iron process.