What precautions should be taken when using molybdenum disilicide elements in the low-temperature range (below 400°C)?
2026-04-10
When molybdenum disilicide elements are used in the low-temperature range (below 400°C), special attention must be paid to the potential failure of their oxidation‑protective mechanisms.
When molybdenum disilicide components are used in the low-temperature range (below 400°C), special attention must be paid to the failure of their oxidation‑protective mechanism. At elevated temperatures, this material relies on a dense silicon dioxide (SiO₂) surface film to resist oxidation; however, when the temperature drops below 400°C, the compactness of this protective layer deteriorates markedly, and microcracks may even develop. Under such conditions, oxygen can penetrate the oxide layer and directly contact the underlying material, triggering low‑temperature oxidation reactions that lead to surface pulverization and spalling. This process is irreversible and can significantly reduce the component’s service life.
When operating in the low-temperature range, it is essential to strictly adhere to the principle of rapid heating. It is recommended to use programmed temperature control to maintain a heating rate of at least 5–10°C/min, thereby minimizing the residence time within the hazardous temperature window of 400–700°C. If process requirements mandate holding within this range, the duration of each individual cycle should be shortened, and the total number of cycles limited. For example, in the debinding process for oxide ceramics, after debinding below 600°C, the temperature should be promptly raised to above 1400°C to repair and protect the surface layer.
During component installation, sufficient thermal expansion clearance must be provided to prevent fracture caused by low‑temperature embrittlement. During operation, the degree of powdering in the electrode area should be monitored, and any detached debris应及时 removed to avoid short circuits. For intermittent‑use applications, it is recommended to replace molybdenum disilicide elements with iron–chromium–aluminum heating wires, or to employ low‑current preheating to reduce the dwell time in the low‑temperature range, thereby balancing process requirements with material characteristics.
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