The operation process of the vacuum furnace

1, preparation,
Turn on the chiller switch, otherwise the device will alarm with low water pressure.
2. Turn on the power switch.
Before power supply, check the state of each switch;
1. The heating mode shall be placed in the “manual” file, and the power adjustment will rotate counterclockwise to the end;
2. Whether the pressing switch is in a stop position, the pressure potentiometer will rotate to the minimum t.
The above inspection is correct. Turn on the main power switch first. Turn on the power switch again.
3. Open the furnace to sample.
General in the vacuum state, need not when the stove before use should be observed if a vacuum in vacuum furnace, first through the inlet valve slowly to inflatable to atmospheric pressure of furnace body, and then use thousand top open the furnace cover, take out two lid. Put the sample into the furnace. If do not pressure sintering, must not forget the inside and outside two insulation cover must cover. Otherwise the temperature might not go up;
If the heating sintering is to be carried out, it is necessary to remove the small cap in the middle of the outermost insulation cover to remove the thermal insulation cover.
Note: be careful not to have a short circuit between the heating body and the shell.

4. Set heating procedure for vacuum furnace.
L, warming: generally set by program, the maximum heating rate 100 ℃ / min, if the early stage of the experiment to fast heating-up heating mode can be placed in the “manual”. Adjust the power slowly to raise the current slowly. Usually under 200 ℃ can be manually first to heat up, otherwise the temperature control is not allowed. L000-2000 ℃, can use infrared automatic control of furnace temperature.
Note: the heating must be carried out in a vacuum state: observe the current meter indicating that it is forbidden to exceed the secondary rated current 700A.
2. The cooling can be set by the program, or the heating can be turned off directly to cool itself.
Note: water is not allowed in the cooling process, otherwise the furnace body sealing ring will be burnt out.
5. Set pressure program.
1. Prepressure: the prepressure should be carried out before the temperature rise, and the pressure setting range is between 1.0-1.5mpa. Pre – pressure can be pressurized by hand.
2. Pressure: after the temperature rises to the predetermined temperature, the sample is pressurized. The program is usually programmed to automatically pressurize the sample.
The maximum pressure value that the device can achieve is 16MPa, equivalent to f 10t(16MPa=1m).
A, manual Ⅱ turn pressurized potentiometer, observe the displacement of the instructions at the same time, the displacement change is very small, upper and lower punch has contact with the sample. When the pressure is over, the “up-stop – down” switch is placed at the stop position, and the pressure potential device turns to the minimum.
B. Automatic pressure: first set the required pressure on the instrument. When the required pressure and the pressure of the banquet are basic, it will “rise.”
Stop – down “switch is set to rise, and displacement observation Ⅱ force changes, such as rise in place after the automatic pressure and voltage stabilizing function. Pressure end R needs to be “up – stop a drop” switch to drop. When you reach the bottom, you will be “up and down” switch to stop. Finally close the hydraulic pump.
Note: the pressure should be negative and the hydraulic pump should be stopped without pressure or pressure relief. The oil cylinder is set to stop when not in use, otherwise it will be misoperated.
6. Electric furnace evacuation procedure:
1, the low vacuum: all the vacuum valve closed, start the mechanical pump, after waiting for its running normally (about 1 to 2 min), open to the furnace of low vacuum valve disc valve, in advance of furnace smoke low vacuum;
2, high vacuum: open the disc yan, the diffusion pump suction, after vacuum under 15 Pa, open to preheat diffusion pump, diffusion pump in about after 45 min started its function, can closed on disc valve, at the same time open the main stop valve for vacuum choose to power Pa 1.33 x 10-1 above, the samples can only open the heating button to heat.
A, the vacuum meter has two range meters, and the low vacuum range is 1.0 x 10 to the 5th power -1.0 x 10 to the -1 power: high vacuum range 1.0 x 10 to the -1 power -1.0 x 10 to the -5 power, generally starting at 2Pa. Note that the vacuum furnace switch should be shut off before filling the atmosphere to prevent aging.

Video Display : How to operate vacuum furnace