Tungsten Crucible Sintering Process

Tungsten crucible sintering process:
Sintering in the medium frequency induction furnace, and the temperature is controlled at: 2200 ℃ -2250 ℃ around, and should be held 3h-5h. Thermal insulating once again in the middle-temperature phase, the control of temperature is around 1600 ℃ -1700 ℃, time thermal insulation is around 1.5h, so densification of product will be better . Moreover, heating temperature speed should not too fast, otherwise the crucible is easy to deform, and the temperature should be controlled at: 80℃-100℃around. Besides, the vacuum degree should be bigger than 0.67Pa when sintering.

In addition, through matting the same material tungsten plate at the bottom of the crucible or installing the furnace by proper way, and it will be possible to avoid the situation in which the sintering tungsten crucible bottom will crack, making the quality of tungsten crucible is guaranteed. By this sintering process, tungsten crucible density can reach to 17.3g / cm³ and above.


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