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High-temperature vacuum heat treatment furnace experiment points to note

High-temperature vacuum heat treatment furnace experiment points to note       
1. High temperature furnace vacuum furnace should have a fast-cooling device. Cooling water pressure should be greater than 0.2Mpa, the flow should be adjusted.
2. Heating up: After you insert the workpiece, usually before the first pre-heated to 6.67Pa pumping heating
3. Heating process, the workpiece material and the furnace will be deflated, the vacuum degree drop.
4. Cooling gas: steel commonly used 99.995% purity nitrogen, high-temperature alloys using 99.999% nitrogen or argon, titanium using 99.995% argon.
5. Experimental furnace vacuum furnace used in all parts of active connections rubber O-ring seals the connection, this section are cooled by water.
6. The heating temperature vacuum annealing, vacuum annealing, vacuum and vacuum aging solution treatment temperature is generally the same as conventional treatment and heating.
7. Quenching the workpiece in a vacuum, you should use a vacuum quenching oil, this oil has a lower saturation vapor pressure.
8. Experimental furnace vacuum furnace maintenance should charge under vacuum or nitrogen state, to avoid the usual intake when not absorb moisture.
9. Domestic vacuum furnace pressure rise rate should not exceed 1.33Pa / h, certain standards for foreign companies 0.67Pa / h
10. Vacuum furnace processing titanium, should not use nitrogen as the cooling gas, because titanium and nitrogen at high temperatures, to form titanium nitride golden.
11. Vacuum heating to the main radiation, the workpiece in the furnace should be kept spacing.

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