The cause of graphite crucible is roughly divided into:

1. Processing defect

The crucible fracture caused by this type of reason is generally cracked from the seam and then spread. It is usually cracking in the vertical direction. This kind of problem is easier to discover because it is too obvious. The cause of such problems is mainly the angle of the seam transition (typically 105 ° or 115 °) in the intersection portion, and does not use the rounded corner buffer, and the micro tear of the knife tip part during the processing process, and In the process of use, the stress of the itself, causing cracking.

2, design defect

Because this reason is that the manifestation of the crucible is generally in the R portion and the upper crucible binding portion, it is generally transversely broken, and is generally high in both sides; if it is all fed, it can be obvious, it can be obvious to discover both ends. The splinter cannot be coincident. The real reason is that the stress in the upper wall thickness portion and the lower partial thick portion of the crucible after use, resulting in a stress concentration, and finally causes graphite crucible.

3, improper use

This is mainly due to the time of cooling and cooling the furnace. The user will have a shortened temperature temperature time and cooling time and the cost of the cooler time, and it is understood that this can be understood. However, the material of graphite can not be able to take this cooling speed. When the graphite material increases in the temperature rise, the strength will increase, in other words, the strength will decrease when the temperature is lowered. The stress caused by the temperature difference between the temperature, the temperature difference between the outer wall and the inner wall is more than the scope of the crucible, this is to consider it.

4, raw material defect

This reason is actually the biggest reason. Because the physical properties of the graphite crucible itself are mainly thermally conductive, thermally expand these two aspects, causing the crucible to easily generate stress and not easily eliminate; in addition to the graphite production, Impregnation, roasting, graphitization and purification process time is not easy to monitor, although the overall performance is more than one, but there is still a certain difference between the various parts of the same graphite, which determines that graphite will fundamentally exist. A certain problem.

5. Transport loading and unloading

Transport loading is mainly in the transportation process, this is related to the packaging of all hot field manufacturers, and also related to logistics companies. But now most of them choose to deliver themselves, this reason is gradually decreasing. The loading and relief is mainly in the pulley process, especially the novice assistant industrial, and occasionally occasionally occur.