Industry news

A shutdown is the most vulnerable period for molybdenum electrodes: thermal shock during cooling, high-temperature oxidation of the exposed section and corrosion by residual melt all occur at once. This article distinguishes planned from emergency shutdowns, sets out the key points of stepped power reduction, maintaining water cooling, protective gas coverage and restart after reheating, and gives a checklist before recommissioning.

When a molybdenum crucible deforms, gets scratched or thins locally, whether to keep running, repair or replace is often decided by experience. This article gives criteria based on wall thickness, cracking and deformation, and service stage, so defect-laden use is avoided while cost is weighed.

Lanthanum-doped molybdenum disperses a small amount of lanthanum oxide along the grain boundaries, suppressing grain growth after recrystallization and improving high-temperature strength retention and low-temperature toughness. This article explains the strengthening mechanism, compares the application boundaries of pure molybdenum, lanthanum-doped molybdenum and TZM, and discusses section-by-section selection plus machining and welding precautions.

In vacuum melting of superalloys, molybdenum crucibles face temperature gradients, attack by reactive elements and charging impact. This article observes actual conditions in an induction furnace, analyses how the interfacial reaction layer forms and how to judge it, discusses the effect of charging practice on thermal shock, and gives replacement criteria covering wall thickness, cracking and rim deformation.

Internal porosity and cracks are found by ultrasonic testing, surface-breaking defects by penetrant and eddy current testing, and overall soundness is checked by the density method. Each technique has different capability limits, and only combining them by defect type and process stage intercepts defects effectively. This article reviews the principles, applicable defects and acceptance coordination of each method.

Molybdenum has a thermal expansion coefficient of about 5.25×10⁻⁶/°C, and together with its high thermal conductivity this keeps the differential stress on electrodes low during heating, cooling and power fluctuations. Starting from the thermal stress relationship, this article explains the value of low expansion for wall penetration seals and transition sections, and sets out the constraints that installation and heat-up procedures must respect.

Quartz and molybdenum crucibles often appear in the same shop, yet their duties and consumption logic differ. This article distinguishes their positions in crystal pulling, melting and coating, explains why material properties prevent simple substitution, and discusses line-wide matching and spare-part management through ledgers, rejection criteria and segregated storage.

Float glass and photovoltaic glass each account for roughly half of Jiangsu's capacity, and electrode consumption intensity is high. This article examines the large-furnace configurations in Suqian, Nantong and Zhangjiagang, the pulsed demand created by alternating cold repairs and start-ups, the consumption gap between southern and northern Jiangsu, and offers cost structure, logistics lead times and line-by-line stocking guidance for procurement reference.

The same batch of molybdenum electrodes can differ by months in service life on different furnaces, and the gap is often already fixed at installation. This article sets out the standard sequence from technical preparation, unboxing re-inspection, handling, assembly, tightening, cooling and insulation checks, staged energization and first-month monitoring, with reference values for key control points, a table of common errors and their consequences, and three installation case reviews.

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.

As crucible diameter and height increase, powder filling, isostatic pressing uniformity, sintering shrinkage and machining allowance all impose new constraints. This article analyses these difficulties stage by stage, explains the special requirements for large parts in can design, clamping and measurement, and discusses the trade-off between segmented and monolithic forming and the question of measurement datums.

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.

Spent molybdenum crucibles still carry material value, but recycling is not the same as remelting. This article sets out grading criteria based on service history and external condition, explains the sequence and risks of mechanical cleaning, alkaline and acid washing and sampling analysis, uses comparison tables to separate remanufacturing from remelting, and covers traceability from goods receipt to re-dispatch and the economics, so shops can set their own rules.

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.

When comparing the carbon emissions of flame melting and electric melting, the conclusion often depends on the accounting boundary. This article breaks down how combustion-side and electricity-side emissions are booked, why certified output should be the denominator, and how the power mix changes the scenario, and lists items that are easily missed, such as furnace heat storage, power supply losses and auxiliary systems, so that companies can align their basis before a project review.

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.

Coating materials such as niobium oxide and titanium oxide place specific demands on crucible chemical stability, wettability and contamination control during melting and evaporation. This article lists those requirements, sets out the applicable boundaries and limitations of molybdenum crucibles, compares molybdenum, graphite, ceramic and tungsten crucibles in a table, and describes a small-batch trial and evaluation method.

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.

The process window of vacuum sintering is narrow, and if a crucible is chosen only on the basis of what fits inside, the margin is often found to be insufficient when the sintering curve is adjusted later. This article sets out the selection steps in order of temperature, charge weight, wall thickness and bottom support, and handling method, and explains how vacuum level and setter material affect performance, giving an executable selection sequence.

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.

Energy consumption from powder to finished molybdenum electrode is unevenly distributed. This article breaks down the consuming points across pressing, sintering, forging, annealing, machining and auxiliary systems, analyzes how furnace load and heating curve, furnace insulation, waste heat recovery, load shifting and submetering affect specific consumption, and recommends an upgrade sequence of metering first, operating adjustments second and equipment replacement last.

In 2026 China's ceramic fiber exports continued to grow, with the product mix upgrading from standard blanket to zirconia-containing, high-purity and polycrystalline mullite materials and markets expanding into Southeast Asia, the Middle East and other emerging regions. Downstream industrial furnace construction is also carrying molybdenum electrode packages overseas.

With rare earth mining and smelting total volume quotas under unified management, the industry focus has shifted from capacity expansion to greener and smarter operations, and upgrades of molten salt electrolysis cells have accelerated. This article analyzes the relationship between larger cell types, current efficiency and electrode life, and explains how molybdenum electrodes perform in fluoride molten salts and what to consider when selecting them.