DEVICE FOR HIGH-TEMPERATURE TREATMENT OF HIGH-MELTING MATERIALS Russian patent published in 1998 - IPC

FIELD: high-temperature treatment of materials. SUBSTANCE: device has lined body, high-temperature resistive heater made of high-fireproof oxides in the form of heating plates with holes positioned one under the other with clearance. Holes are arranged coaxially and form operating channel. Each plate is provided with separate power supply and power control system. Heating plates are of circular form. They have current leads provided at the ends with metal coating. Plates and current leads are made of lanthanum chromite modified by calcium of the following composition: for heating plates La_1-xCa_xCrO₃, where x - 0.02 - 0.07, and for current leads La_1-xCa_xCrO₂, where x - 0.10-0.18. Content of calcium in heating plate material is selected less than in current lead material by at least 0.08 mole fraction. EFFECT: reduced power consumption, extended service life and simplified construction of device. 2 cl, 5 wdg5