DETECTING ELEMENT OF MOLTEN METAL LEVEL IN CASTING MOLD

摘要

PURPOSE:To decrease the oxidative consumption in the stage of oil casting of a detecting element by coating the outside circumferential surface of a main electrode material with a heat resistant material except the part to be used as the electrode. CONSTITUTION:A half-pasty phenolic resin 13 is coated on the outside circumferential part of a main electrode material 12 consisting of carbon, etc. except both ends to be used as an electrode. After foam is removed in a vacuum, the material is rested for about 24hr. The phenolic resin is cured in a thermostatic bath kept at about 200 deg.C. The carbonizing speed of the phenolic resin coated layer 13 is decreased toward the inside to shut off the intrusion of highly hot air to the material 12. The oxidative consumption of the material 12 is prevented by the above-mentioned method and the electrode follow-up type molten metal level gage is made usable even in the stage of oil casting.