Zone melting furnace thermal field with dual power heating function and heat preservation method
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United States of America Patent
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Oct 24, 2017
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app pub date -
May 16, 2013
filing date -
Apr 25, 2013
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Abstract
The present invention aims at providing a zone melting furnace thermal field with a dual power heating function and a heat preservation method. The zone melting furnace thermal field comprises a primary heating coil and an auxiliary heater, wherein the auxiliary heater has a wavy appearance bent repeatedly up and down and forms a circular loop by surrounding in the horizontal direction, wherein both end parts of the auxiliary heater are provided with ports and are connected with an auxiliary heating power supply through cables; and the auxiliary heating power supply is also sequentially connected with a data analysis module and an infrared temperature measuring instrument through single lines. The present invention can solve the problem of single crystal rod cracking caused by unreasonable distribution of the thermal field and overlarge thermal stress in the growth process of zone-melted silicon single crystals over 6.5 inches, and simultaneously can improve the thermal field distribution in the growth process of 3-6 inch zone-melted silicon single crystals.
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