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Prevention and Control of Out-of-Control Furnace Atmosphere: Precision Regulation and Sealing Optimization Build a Solid Defensive Barrier

2026-01-23

Prevention and Control of Out-of-Control Furnace Atmosphere: Precision Regulation and Sealing Optimization Build a Solid Defensive Barrier

Out-of-control furnace atmosphere (e.g., excessive oxygen content, excessive carbon potential fluctuation) can lead to workpiece decarburization, excessive carburization or aggravated oxidation. Especially in controlled atmosphere heat treatment, a carbon potential deviation of ±0.05% will cause the carbon content on the workpiece surface to deviate from the designed value, impairing its hardness and wear resistance. The main causes include improper atmosphere proportioning, furnace body seal leakage, and carbon potential sensor failure, among others.

Core prevention and control technologies are as follows:

Achieve precise control of atmosphere proportioning: adjust the proportion of nitrogen, methanol, acetone and other media accurately by using gas mixers in accordance with process requirements (e.g., control the methanol injection rate at 20-30 drops per minute in nitrogen-based controlled atmosphere). Conduct real-time monitoring of oxygen content and carbon potential via infrared analyzers, and realize automatic feedback regulation of medium input volume.
Strengthen the air tightness of the furnace body: adopt high-temperature resistant sealing materials (e.g., graphite sealing rings) for key parts such as furnace door gaskets, thermocouple ports and fan shafts. Conduct air tightness tests on a monthly basis and check for leakage points by the soap solution smearing method, ensuring a slight positive pressure of 50-100 Pa inside the furnace to prevent air infiltration.
Perform regular maintenance of carbon potential sensors: clean oxygen probes and carbon potential probes once every 3 months to remove surface carbon deposition and oxide layers; replace sensor components once a year to ensure detection accuracy and avoid the failure of atmosphere control caused by sensor drift.

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Prevention and Control of Out-of-Control Furnace Atmosphere: Precision Regulation and Sealing Optimization Build a Solid Defensive Barrier

Prevention and Control of Out-of-Control Furnace Atmosphere: Precision Regulation and Sealing Optimization Build a Solid Defensive Barrier