What are the causes of the various colors on the surface of silicon rods in the reduction furnace?
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What are the causes of the various colors on the surface of silicon rods in the reduction furnace? 1: Black: 2: Blue 3: Colorful 4: Yellow: etc. . . . . . . . . . . . . . . . . . . ! ! ! ! !
This phenomenon is generally referred to as oxidation for several reasons: 1. The presence of oxygen (water) in the raw materials； 2. High HCL content in the raw materials ； 3. The ratio of trichlorosilane to hydrogen is inappropriate. Wait, there are many such cases; treatment varies.
Blue or colored: nitridation; black: moisture present in the material; yellow: improper mixing ratio – yellow appears more often during sudden stops