Recently, I heard many people use itGraphite crucibleTransverse cracks occurred in the process, which led to no use. Are these caused by material problems or improper use? With regard to this problem, through consulting the data, we found that there were three positions where the transverse cracks appeared. Xiaobian also made an analysis of the causes, hoping to be of some help to everyone.

The first part: close to the bottom of the crucible (which may cause the bottom of the crucible to fall off)

Cause analysis: 1. The temperature rises too fast during preheating.

2. Hit the bottom with a hard object such as an iron bar.

3. The residual metal at the bottom of the crucible will also cause such damage due to thermal expansion.

4. It may be caused by hard objects hitting the inside of the crucible, such as throwing the casting material into the crucible

The second part: in the general position of the crucible

Cause analysis:

1. Place the crucible on the slag or inappropriate crucible base

2. When taking the crucible, if the position of the crucible clamp is too high and the force is too large, cracks will appear on the surface of the crucible at the lower part of the crucible clamp.

3. The burner is not properly controlled, some of the crucible is overheated, some of it is not effectively heated, and the crucible is cracked due to thermal stress

The third part: there is a transverse crack at the lower part of the crucible nozzle when the pouring crucible or the crucible with a nozzle is used

Cause analysis:

1. Not installed correctly.

2. When installing a new crucible, if the refractory soil is tightly pressed under the crucible nozzle, the stress points will be concentrated at the crucible nozzle during the cooling and contraction of the crucible during use, resulting in cracks.

3. Improper selection of crucible base.

In the process of using the graphite crucible, we must pay more attention to the three parts that are prone to transverse cracks, and addGraphite crucibleIn order to avoid serious burst.

Graphite crucible with nozzle