Broken electrodes are among the more troublesome sudden failures in electric melting furnaces. This article classifies fractures into six types: thermal stress, oxidation notching, mechanical load, structural embrittlement, original defects and electrical damage. It gives fracture features, diagnosis methods and matching preventive measures, plus a precursor inspection table and a post-breakage response procedure, and reviews three typical breakage cases.
Technical Encyclopedia
Technical reference on molybdenum electrode selection, installation practice, oxidation protection, failure analysis and replacement intervals for glass furnace, fiberglass tank and high-temperature melting engineers.
WeiBeam · Electrode solutions for high-temperature melting
97 articles in this category · Page 4 of 4
Article list
Molybdenum is reasonably machinable in the annealed state but prone to edge chipping and burn in the recrystallized and high-hardness states. Tool selection, cutting parameters, cooling and lubrication, and grinding wheel matching determine surface quality, which directly governs the initial corrosion site density after charging. This article gives a checklist of process essentials for machining and grinding.
Molybdenum electrodes often spend months in stock between delivery and loading, and slow oxidation in a humid environment plus moisture absorption by molybdenum trioxide quietly degrade the surface. This article gives management essentials for humidity control, sealed packaging, segregated placement and first-in-first-out, and explains why re-inspection before loading is necessary.
Assessing the remaining life of a molybdenum electrode means turning diameter loss, electrical drift and inspection records into a trend line and anchoring it to the weakest section, such as the melt line or a joint. This article gives worked examples of loss rate and remaining life, electrical criteria, a combination of inspection methods, condition grading, safety margins and how to set the replacement window.
Loss of molybdenum electrodes in molten glass results from chemical oxidation, electrochemical migration and convective scouring acting together, with temperature, redox state, current density and flow field setting the rate. This article breaks down that mechanism chain, explains how each factor acts, and gives process and operating countermeasures to slow corrosion.
TZM is a molybdenum alloy micro-alloyed with titanium, zirconium and carbon; a dispersed carbide phase pins the grain boundaries, giving it a recrystallization temperature and high-temperature creep resistance well above pure molybdenum, which suits long overhanging, heavily loaded electrode sections. This article explains the composition design logic, the key performance differences and the points to watch in machining and service.
Recrystallization temperature is the key to understanding how molybdenum electrodes behave at high temperature. Pure molybdenum recrystallizes roughly between 1090 and 1350 °C, while the electrode working section usually stays above that range for long periods, which brings a fall in strength, grain growth and embrittlement. This article explains how this microstructural evolution affects electrode life and deformation, and gives material selection and operating responses.