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ll921(½ð±Ò+20, ·­ÒëEPI+1): 2010-04-18 09:43
The holes in less dense material rods are the source of the bubbles in The process of crystal growth. the small bubbles which is closed by melt after material rods melting are uniformly distributed in the melt.When the rotational speed is high,under the influence of Centrifugal force, the evenly distributed small bubbles will Converge to the axis and form much bigger bubbles when encountering and finally be the crystal Bubbles With the cooling of the melt.under the influence of gravity,the small Bubbles will float upward with the Up-Grading of melt reigon in the low rotational speed.Therfore,reducing the rotational speed can control the generation of the Bubbles in crystal.It can be seen that there will be no appearence of low angle grain boundary in the crystal of Low-speed growth.
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