Quartz crucibles have the advantages of high purity,high temperature resistance,high dimensional accuracy,good insulation performance,energy saving,and stable quality,and their applications are becoming increasingly widespread.The detection of quartz crucibles is a very important process,and the detection of quartz crucibles is developing towards on-site inspection.
Quartz crucible is made of molten silicon powder,which not only has high process difficulty,but also has high requirements for the performance of high-purity quartz.Let's take a look at which aspects have high requirements.
1.The purity of fused silica ceramic materials should be required,especially the content of impurity elements in some aspects,which will lead to crystallization in the molten state and affect the high-temperature performance of the quartz crucible.
2.Quartz crucible is a key component of the polycrystalline silicon ingot furnace for solar cells.As a container for loading polycrystalline silicon raw materials,it can work continuously at 1550 degrees for more than 50 hours to melt and grow the crystals,and then be used to manufacture polycrystalline silicon ingots for solar cells.Therefore,the usage conditions are very demanding,with strict requirements for the purity,strength,appearance and internal quality,high-temperature performance,dimensional accuracy,etc.of the crucible.These requirements for crucible performance are closely related to the quality of the material during melting.
Related studies have shown that oxygen impurities are easily introduced into the crucible during the casting process of polycrystalline silicon.If thermal donors or oxygen precipitates are formed,the lifetime of minority carriers in silicon materials will be reduced,directly affecting the photoelectric conversion efficiency of solar cells.Therefore,to a certain extent,the purity of the molten tempered glass used as the main raw material is required,especially the tempered glass material used must not contain bubbles.
4.Currently,the main quality hazard of quartz crucibles is cracking(or bursting),which requires timely melt manufacturers to provide products with stable and consistent quality and performance to ensure the high quality and reliability of quartz crucibles made of timely molten glass.Quartz crucibles can be used below 1450 degrees and are divided into transparent crucibles and opaque crucibles.The arc-shaped semi transparent quartz crucible is an indispensable basic material for drawing large-diameter single crystal silicon and developing large-scale integrated circuits.
The above is about the high requirements of quartz crucible for silicon micro powder.You can learn about it.