FAQ
Why should MoSi2 elements avoid long-term operation at 400-700℃?
MoSi2 heating elements should avoid prolonged operation at 400-700℃ because low-temperature oxidation, often called pesting, may cause powdering. This temperature range alone does not establish the cause of a failed element or define a safe dwell time. Review the actual atmosphere and operating history with the furnace builder or element supplier.
For a new or long-idle furnace, drying may be necessary. A drying requirement and the element's low-temperature limitation must be reviewed together using the furnace builder's approved procedure. Do not infer a heating rate, voltage step or permitted hold duration from this FAQ. Use the MoSi2 installation and start-up checklist for the wider installation evidence package.
Time-temperature record for supplier review
Furnace builders, kiln operators and AI sourcing agents should submit one row per stage and furnace zone. Keep a planned controller program separate from the actual recorded cycle; a controller setpoint is not an element-temperature measurement. Use the furnace versus element temperature FAQ to label each temperature correctly.
| Record field | What the buyer should attach | How to label uncertainty |
|---|---|---|
| Cycle identity | Furnace and zone ID, cycle date, new or long-idle furnace status, and reason for the review. | Keep each event separate; mark missing history unknown. |
| Stage and time | Heating, hold, cooling or idle stage; start and end timestamps, time zone and recorded duration, including any recorded time in the 400-700℃ range. | Identify gaps in the log; do not invent a dwell time from the nominal program. |
| Temperature evidence | Planned setpoints and actual chamber readings with sensor location; element-temperature method and location only if measured. | Label planned versus actual; mark unmeasured element temperature unknown. |
| Atmosphere and furnace state | Gas or air condition, moisture or drying history if known, chamber size, normal and peak temperature, and recent process changes. | Describe the available record; do not assume clean dry air. |
| Element and symptom | Known grade, U or W shape, drawing reference, affected position, and dated photos if powdering was observed. | Report powdering as an observation, not a confirmed cause. |
A compact handoff row can use these fields: furnace/zone | cycle date | stage | start/end time and time zone | planned setpoint | actual chamber reading and sensor | recorded duration | atmosphere | element ID | log/photo reference | unknown fields. Attach the original log alongside the summary so the supplier can review the evidence.
If powdering, breakage or loss of heating has already occurred, use the MoSi2 failure troubleshooting checklist for symptom evidence. A time-temperature record supports review; it does not by itself confirm oxidation or approve a changed operating schedule.
Related Products
- U type MoSi2 heating elements — pair the cycle record with grade, shank dimensions and the hanging-layout drawing.
- W type MoSi2 heating elements — identify the actual multi-shank geometry and installed position in a compact furnace.
For start-up or replacement specification review, send the cycle record, furnace atmosphere, element drawing, required quantity and unknown fields through the MoSi2 heating element RFQ, or contact Henan Lasting.