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At 17:05 on August 17, 2021, it is an exciting time. Zhongxin Wafer's first 12-inch 450kg feeding ingot is perfect! The ingot has a net weight of 437.7kg, a body length of 2900mm, a body length of 2400mm, and a yield rate of 87.6%, which is an increase of 4.6% compared to the previous yield rate of 300kg. It can also effectively reduce costs and increase efficiency.

What are the advantages of the birth of Zhongxin Wafer's "overweight" ingots?

1. Achieve process improvement

In the ingot drawing process, the more the material is fed, the higher the requirements for the process and furnace control accuracy. Since the 32-inch quartz crucible can hold up to 340kg of polysilicon material at a time, the increase of the feeding amount to 450kg must be realized by the second feeding technology. Since the establishment of the Zhongxin Wafer 12-inch 450kg feeding ingot R&D project, the R&D team based on the 8-inch secondary feeding in the early stage, according to the 12-inch single crystal furnace structure design supporting the use of secondary feeding tooling, that is, quartz feeder, Feeder trolley, flange and other components. After successfully completing the assembly of all the components, the R&D team conducted a trial in an empty furnace, and finally successfully achieved the company's first 12-inch 450kg feeding crystal rod, which promoted the improvement of the process! In the future, Zhongxin Wafer 12-inch 450kg feeding ingot will form a standardized mass production.

2. Effectively improve output and yield

The successful drawing of high-quality ingots has increased the monthly output of Zhongxin wafers. At the same time, the increase in the length of large-quality ingots has improved the availability of single ingots, which will help increase the yield of 12-inch silicon wafers and stability.

3. Realize cost reduction and efficiency increase

Under the condition of the same diameter of large-quality ingots, it means that the length increases, and the head and tailings are correspondingly reduced, which can increase the utilization rate of the ingots and achieve cost reduction and efficiency; on the other hand, the increase in the amount of feed makes In the case of using quartz crucibles and auxiliary materials at the same price, the output increases, which saves the amount of quartz crucible and auxiliary materials used, thereby reducing costs.